Want to see sea turtles in Costa Rica? Discover peak nesting seasons, top locations like Tortuguero and Ostional, and eco-friendly guided tours with Mapache Tours.
There are wildlife experiences that impress, and there are wildlife experiences that change something. Watching a sea turtle come ashore at night — emerging from the darkness of the ocean with the unhurried deliberateness of an animal that has been making this same journey for a hundred million years, moving up a dark beach by the navigational logic of the magnetic field it was born into, excavating a nest with her rear flippers in movements of extraordinary precision, and laying a clutch of eggs that will, if the conditions hold, produce a new generation of animals into the same ocean — is firmly in the second category.
Costa Rica is one of the world’s most significant sea turtle nesting destinations. Multiple species nest on both its Caribbean and Pacific coasts, in numbers that range from the small and intimate to the genuinely overwhelming. The olive ridley arribada at Ostional — a mass nesting event in which tens of thousands of turtles come ashore simultaneously over a period of several days — is one of the most extraordinary wildlife spectacles on earth. The green turtle nesting season at Tortuguero draws visitors from across the world to a Caribbean canal system that feels, at two in the morning on a dark beach with a nesting turtle ten metres in front of you, like the most remote and significant place you have ever stood.
Understanding when and where these experiences happen — which species nests where, in which months, under what conditions, and how to access the experience in a way that is genuinely responsible — is the foundation of planning a Costa Rica trip around sea turtles. At Mapache Tours, we coordinate sea turtle experiences across all of Costa Rica’s major nesting sites, with guides drawn from the communities that live alongside and protect these animals, and with an operational commitment to responsible wildlife tourism that is built into every aspect of how we plan and conduct these experiences. This guide is our complete answer to the when and where question — and to everything that surrounds it.
Costa Rica’s Sea Turtle Species: Who Nests Where
Five of the world’s seven sea turtle species nest in Costa Rica — a concentration that reflects the country’s geographic position between the Pacific and Caribbean, its extensive protected coastline, and decades of conservation investment that has maintained and in some cases recovered nesting populations that were severely depleted by the mid-twentieth century egg harvesting and adult turtle hunting that affected populations across the region.
The Green Turtle is the species most associated with Costa Rica’s Caribbean coast, and specifically with Tortuguero National Park — which protects the most important green turtle nesting site in the entire Western Hemisphere. Green turtles are large animals, typically weighing between 130 and 200 kilograms, and the females return to the beach on which they were born to nest — a navigational fidelity that makes specific nesting beaches critical to the species’ survival and that makes Tortuguero’s protected status one of the most consequential conservation decisions in the region’s history. Green turtles nest at Tortuguero primarily between June and October, with peak activity in July and August.
The Leatherback Turtle is the largest living reptile on earth — adults reach up to 900 kilograms and over two metres in length — and is among the most endangered of the sea turtle species. Leatherbacks nest on both the Caribbean and Pacific coasts of Costa Rica. On the Caribbean side, Playa Grande in the Parque Nacional Marino Las Baulas on the Nicoya Peninsula and the beaches north of Limón are the primary sites. Pacific leatherback nesting occurs at Las Baulas between October and March, which is among the most significant remaining Pacific leatherback nesting events in the world. Caribbean leatherback nesting occurs between February and July. The leatherback’s conservation status makes every nesting encounter a genuinely significant and weighted experience.
The Olive Ridley Turtle nests in larger numbers in Costa Rica than any other species, and the phenomenon it produces — the arribada, or mass nesting event — is unique among sea turtle behaviours and represents one of the most astonishing wildlife spectacles the natural world offers. Olive ridley turtles nest in enormous aggregations at specific Pacific coast beaches, with Playa Ostional in Guanacaste and Playa Nancite in the Santa Rosa National Park being the country’s primary arribada sites. Individual olive ridley turtles also nest in solitary pattern outside of arribada events across multiple Pacific coast beaches. The Ostional arribada occurs most reliably between July and December, with peak events in September and October.
The Hawksbill Turtle is a smaller and critically endangered species whose nesting in Costa Rica occurs in lower densities than the other species — primarily on isolated Caribbean coast beaches south of Tortuguero and on selected Pacific coast beaches in the Osa Peninsula region. Hawksbill nesting in Costa Rica is not a mass event but a dispersed, year-round occurrence that requires specialist knowledge of specific beach locations to encounter reliably. Hawksbill turtles are distinguished by their distinctive narrow, pointed beak and the striking patterning of their shell — an appearance that made them the target of the tortoiseshell trade that drove the species to near extinction in the twentieth century.
The Loggerhead Turtle is the least commonly observed species in Costa Rica, with occasional nesting documented on Caribbean coast beaches but without the reliable, predictable nesting patterns of the green, leatherback, and olive ridley populations. Loggerhead sightings in Costa Rica are more typically oceanic — the species is present in both the Pacific and Caribbean waters — than coastal nesting encounters.
Where to See Sea Turtles in Costa Rica: The Primary Sites
Tortuguero National Park — Caribbean Coast
Tortuguero is the singular sea turtle destination in Costa Rica and one of the most important sea turtle conservation sites in the world. The national park protects 35 kilometres of Caribbean coastline and the canal system that connects it to the surrounding lowland rainforest — an environment whose isolation, accessed only by boat or small aircraft with no road connection to the rest of the country, has preserved a nesting beach whose integrity is exceptional by global standards.
The green turtle nesting season at Tortuguero runs from approximately late June through mid-October, with peak nesting activity in July and August when the highest numbers of females come ashore each night. During peak season, it is not unusual for fifty to over a hundred turtles to nest on Tortuguero’s beach in a single night — numbers that would have been considered extraordinary in most global nesting contexts but that represent, for Tortuguero, a functioning season within a healthy and protected population.
Night beach walks at Tortuguero are conducted under strict protocols managed by the park administration and licensed local guides. Groups are small — a maximum of eight people per guide — and operate under red-light torches only, approaching nesting turtles only after they have begun laying, remaining behind the turtle’s line of sight throughout the observation, and withdrawing before the turtle begins her return to the ocean. Flash photography is prohibited. The protocol exists because it works — Tortuguero’s nesting population has grown consistently under this management framework, and the conservation outcome of responsible tourism at this site is demonstrably positive.
Leatherback turtles also nest at Tortuguero, primarily between February and July, in smaller numbers than the green turtle season but at a scale that makes the Caribbean leatherback experience at Tortuguero genuinely accessible for visitors who time their visit appropriately.
Best months to visit Tortuguero for sea turtles: July and August for peak green turtle nesting. June and September as strong shoulder options within the green turtle season. March and April for leatherback nesting. The October through May window outside these peaks offers canal wildlife and the lodge experience without guaranteed turtle nesting encounters.
Logistics: Tortuguero is reached by boat from the Moín canal landing near Limón (approximately two hours through the canal system) or by domestic flight from San José to the Tortuguero airstrip (approximately 30 minutes). Mapache Tours coordinates both access options and recommends the domestic flight for visitors whose primary motivation is the turtle experience and who want to preserve energy for the night beach walks.
Playa Ostional — Nicoya Peninsula, Guanacaste
Playa Ostional is the site of the most dramatic sea turtle experience in Costa Rica and one of the most dramatic wildlife spectacles on earth — the olive ridley arribada, a synchronised mass nesting event in which tens of thousands of female olive ridley turtles come ashore at the same beach over a period of three to eight days, nesting in densities so high that later-arriving females excavate and destroy the nests of turtles that came ashore days before them.
The scale of an Ostional arribada is genuinely difficult to communicate. During the peak of a major event — most reliably in September and October — the beach at Ostional is covered, from the waterline to the vegetation, with nesting turtles. The sound is continuous — the movement of thousands of large animals through sand, the exhalation of breath, the percussion of flippers. The smell is specific and salt-heavy. The visual experience of walking a beach where every square metre contains a nesting or recently nested turtle, in every direction as far as the eye can reach, is one that produces in most observers a response that exceeds the vocabulary of standard wildlife encounter description.
The Ostional Wildlife Refuge, managed in cooperation with the local community of Ostional, operates a controlled and internationally recognised management system in which the community is licensed to harvest eggs from the first days of each arribada — when the density of nesting is so high that later turtles destroy earlier nests anyway — in exchange for providing protection for the remainder of the nesting event and for the beach outside of arribada periods. This community-based management model has produced a documented increase in the Ostional olive ridley population and represents one of the most successful examples of sustainable community wildlife management in Central America.
Daytime visits to Ostional during an active arribada are possible and produce an experience of extraordinary quality — unlike Tortuguero’s strictly nocturnal beach protocol, the Ostional daytime arribada experience allows full observation in natural light, making it more accessible for families with young children and for photographers whose work depends on light quality. Night visits offer the additional dimension of a beach lit only by starlight and the bioluminescent plankton that sometimes illuminates the wave wash.
Best months to visit Ostional for sea turtles: September and October for the highest probability of major arribada events. July, August, November, and December for smaller arribadas and individual nesting outside of mass events. June through December is the primary olive ridley season at Ostional, with the dry season months (January through May) representing the lowest nesting activity.
Logistics: Ostional is approximately one hour north of Sámara on the Nicoya Peninsula by road — a distance that makes it a natural day excursion from a Sámara base, or an independent destination for visitors focused specifically on the turtle experience. The road to Ostional includes a river crossing that requires a 4×4 vehicle in wet season conditions. Mapache Tours coordinates all Ostional visits including transport and community guide coordination.
Playa Grande and Las Baulas National Marine Park — Guanacaste
Playa Grande, within the Marino Las Baulas National Park north of Tamarindo on Guanacaste’s Pacific coast, is the most significant remaining Pacific leatherback nesting site in Costa Rica and one of the most important in the world — a designation that makes every visit to this beach during nesting season an encounter with a genuinely endangered population at a genuinely critical site.
Pacific leatherback numbers at Las Baulas have declined significantly from the historic highs of the 1980s and 1990s — a trajectory that reflects the species’ extreme vulnerability to incidental capture in longline and trawl fisheries, beach development, and the loss of nesting habitat across the Pacific basin. The remaining population that nests at Las Baulas represents a fraction of the historic numbers, which makes the conservation context of a Las Baulas visit more weighted than most wildlife experiences and which makes responsible tourism at the site — strictly managed, limited in group size, and conducted under protocols designed to minimise any disturbance to nesting females — more consequential than at sites with more robust populations.
The leatherback nesting season at Las Baulas runs from October through March, with peak activity in November through January. Night beach access is strictly managed by the park administration — visitor numbers are limited, approach protocols are rigorously enforced, and the experience is conducted entirely under red-light conditions. The leatherback’s scale — a mature female at Las Baulas may weigh 500 kilograms or more and measure close to two metres from head to tail — makes an encounter of a different physical register from green or olive ridley experiences. The animal’s sheer size, its evident effort in the nesting process, and the conservation weight of the encounter combine to produce what many visitors describe as the most moving wildlife experience of their lives.
Best months to visit Las Baulas for sea turtles: November through January for peak leatherback nesting. October and February as viable shoulder options. The dry season months from April through September produce little to no leatherback nesting at this site.
Logistics: Playa Grande is accessible from Tamarindo by boat across the estuary (approximately ten minutes) or by road around the estuary via Huacas. Night tours must be booked through the park administration or licensed local operators — walk-in beach access during nesting season is not permitted. Mapache Tours coordinates all Las Baulas visits including the park permit process and transport from accommodation bases in the Tamarindo or Flamingo areas.
The Osa Peninsula — Pacific South
The Osa Peninsula’s isolated Pacific coastline supports nesting populations of several species — olive ridley, leatherback, hawksbill, and occasional green turtle nesting has been documented on the peninsula’s beaches — in a context that is entirely different from the managed, high-volume nesting sites at Tortuguero, Ostional, and Las Baulas. Osa Peninsula turtle encounters are encounters with individual nesting females on beaches that receive few visitors, within primary rainforest that comes to the water’s edge, in an environment whose wildness and isolation give the experience a character that the more visited nesting sites cannot replicate.
Nesting on the Osa Peninsula is documented year-round on different beaches within and adjacent to Corcovado National Park, with olive ridley activity peaking in the wet season months and leatherback nesting occurring between October and March. The specific beaches where nesting is most reliably observed vary by season and require local guide knowledge to access responsibly — several are within the national park’s restricted areas, and access requires park coordination that Mapache Tours manages as part of all Osa Peninsula itineraries that include a turtle nesting component.
The Osa Peninsula’s turtle experience is most appropriate for visitors whose primary motivation is the environment surrounding the encounter rather than the guaranteed scale of the nesting activity — the combination of remote Pacific coast wilderness, primary rainforest at the beach edge, and the possibility of encountering a nesting turtle on a beach that you may share with no other visitors is the specific quality that the Osa offers, and it is a quality that the larger, more managed nesting sites, for all their extraordinary wildlife value, cannot provide.
Best months for Osa Peninsula turtle encounters: Year-round possibility with peak olive ridley activity from May through November and leatherback nesting from October through March.
Caribbean Beaches South of Tortuguero — Limón Province
The Caribbean coast south of Tortuguero — from the town of Limón extending to the border with Panama — supports nesting populations of green, hawksbill, and leatherback turtles on a series of beaches that receive a fraction of the visitor attention directed at Tortuguero itself. These beaches are managed by a combination of local community conservation groups, NGOs, and the national parks system, and accessing them requires the kind of local community relationships that distinguish a professional local operator from a booking platform.
The community of Gandoca, within the Gandoca-Manzanillo Wildlife Refuge near the Panamanian border, manages a leatherback and green turtle monitoring and conservation programme that accepts a small number of visitors during nesting season — a genuine community-based conservation encounter that bears little resemblance to the managed tourism experience at Tortuguero and that produces, for visitors who seek it out, something closer to participation in conservation than consumption of wildlife.
Best months: Green turtle nesting June through October, leatherback nesting February through July, hawksbill year-round in lower densities.
The Responsible Sea Turtle Viewing Code
Every sea turtle encounter in Costa Rica should be conducted within a framework of responsibility that protects the animals and the nesting behaviour that makes these experiences possible. The following represents the standard that Mapache Tours applies to every turtle experience we coordinate — and the standard that any visitor to a Costa Rica nesting beach should demand of the operator they travel with.
Always use a licensed local guide. The protocols that protect nesting turtles — approach distances, timing, light discipline, group size — are enforced through guide-led access at every significant nesting site in Costa Rica. Attempting to access nesting beaches independently, outside of licensed guide systems, is both illegal at most sites and genuinely damaging to the nesting behaviour it seeks to observe. A licensed local guide is not an optional enhancement — it is a protection for the animal and a condition of legitimate access.
No white light, no flash photography. Sea turtles navigating to and from the nesting site are sensitive to white light, which can disorient nesting females and cause hatchlings emerging from their nests to navigate toward light sources rather than the ocean. Red-light torches are the only appropriate illumination on nesting beaches at night, and flash photography is prohibited without exception at all Costa Rica nesting sites.
Maintain distance and silence during the approach. Nesting turtles are disturbed by movement and sound during the approach to the beach and during the early stages of nest excavation — the period when they are most likely to abort the nesting attempt and return to the ocean. Observation should begin only after the turtle has begun laying, at which point she enters a concentrated physiological state that allows closer, quieter observation than the approach phase permits.
Never touch a nesting turtle, her eggs, or hatchlings. The temptation to touch — to make physical contact with an animal of this age and significance — is understandable and should be resisted completely. Contact with the female disturbs the nesting process. Contact with eggs transfers scent and bacteria that can affect hatch success. Contact with hatchlings interferes with the magnetic imprinting process through which they record the geomagnetic signature of their birth beach for future reproductive navigation.
Support the community conservation programmes that protect these beaches. The long-term survival of Costa Rica’s sea turtle nesting populations depends on the economic and cultural valuation of living turtles by the communities that share the coastline with them. Visiting through community-based operators, spending money locally, and understanding the conservation context of each site are the choices that determine whether access to these experiences remains possible for the travellers who come after you.
Planning to See Sea Turtle in Costa Rica with Mapache Tours
Timing a Costa Rica trip around a specific sea turtle experience requires the kind of knowledge that accumulates through direct, sustained engagement with these sites across multiple seasons — understanding the variability of the Ostional arribada, the year-to-year shifts in Tortuguero’s peak nesting weeks, the specific conditions that produce the best leatherback encounters at Las Baulas. This is knowledge that Mapache Tours has built over years of coordinating sea turtle experiences for clients from around the world.
We coordinate turtle experiences at every major nesting site in Costa Rica — Tortuguero, Ostional, Las Baulas, the Osa Peninsula, and the community conservation sites of the southern Caribbean coast — with guides drawn from the communities that have lived alongside and protected these animals for generations. Our booking process includes an honest assessment of the probability of the specific encounter our clients are seeking in the window they are travelling, with clear guidance on which sites and which months produce the most reliable experiences for their specific priorities.
For visitors whose sea turtle experience is the primary motivation for their Costa Rica trip, Mapache Tours builds itineraries specifically around the nesting calendar — positioning other destinations and experiences in the days before and after the turtle encounter to create a complete trip in which the turtle experience is the centrepiece rather than an addition to a standard itinerary.
Visit mapachetours.com to begin planning your sea turtle experience in Costa Rica — with the local knowledge, the community relationships, and the conservation commitment that this kind of encounter deserves.
Frequently Asked Questions
Which Costa Rica sea turtle experience is best for first-time visitors? Tortuguero during the green turtle season (July and August) is the most reliable and most consistently extraordinary first-time turtle experience in Costa Rica. The nesting numbers are high, the logistics are well-established, the conservation credentials of the site are exceptional, and the surrounding environment — the canal system, the lodge wildlife, the rainforest — provides a complete destination experience around the turtle encounter itself. For visitors whose dates align with the Ostional olive ridley season (September and October), the arribada experience is arguably more visually dramatic than anything else the natural world offers — but it is a more specific and logistically demanding experience that benefits from prior Costa Rica travel context.
Can we see sea turtles nesting during the dry season in Costa Rica? Yes, though the options are more limited than in the wet season months. Pacific leatherback nesting at Las Baulas runs from October through March, with November through January representing peak activity — a window that covers the early dry season months. Individual olive ridley nesting outside of arribada events continues year-round at some Pacific coast beaches. The Gandoca community leatherback programme on the southern Caribbean coast operates from February through July. A dry season visit can absolutely be structured to include a sea turtle encounter, though the green turtle season at Tortuguero and the Ostional arribada are wet season phenomena that dry season travel cannot access.
How long should we plan to spend at a sea turtle nesting site? Two nights at Tortuguero or Las Baulas provides the optimal balance of experience depth and logistical efficiency — enough time for a guaranteed night beach walk attempt and a backup night if weather or low nesting activity affects the first. For Ostional, a single day visit during an active arribada is sufficient — the scale of the experience means that additional nights add limited value relative to the first observation. For the Osa Peninsula and southern Caribbean community sites, the turtle encounter is one element of a broader destination stay rather than the primary logistical anchor.
Is a sea turtle experience appropriate for children? Yes, for children old enough to manage the specific conditions of the experience — quiet, darkness, patience, and the ability to follow guide instructions without prompting. Most children from approximately five or six years upward manage the Tortuguero night beach walk well, particularly when accompanied by a guide who has experience adapting the experience for younger visitors. The Ostional daytime arribada is the most child-appropriate sea turtle experience in the country — full natural light, no darkness or strict silence requirement, and a visual scale that produces immediate and profound impact in children of all ages. Mapache Tours advises specifically on age-appropriateness for each site during the itinerary planning process.
What is the conservation status of Costa Rica’s sea turtle populations? The picture is mixed and species-specific. Green turtle populations at Tortuguero have shown significant recovery under the protection of the national park and the long-term monitoring programme operated by the Sea Turtle Conservancy — one of the most documented conservation successes in the history of sea turtle research. Olive ridley populations at Ostional are stable and managed sustainably under the community harvest programme. Pacific leatherback populations at Las Baulas have declined severely from historic levels and remain a serious conservation concern despite the park’s protection — the species’ vulnerability to longline fisheries bycatch across the Pacific is a threat that beach protection alone cannot resolve. Hawksbill populations remain critically endangered globally, with Costa Rica’s nesting population small and dependent on continued beach protection and fisheries management.
The Encounter Worth Planning For
A sea turtle nesting encounter in Costa Rica is not a wildlife sighting in the ordinary sense. It is contact with deep time — with an animal whose lineage predates the dinosaurs, whose navigational system operates through the planet’s own magnetic field, and whose reproductive behaviour connects the beach in front of you to the same beach, possibly visited by the same turtle’s ancestors, for a hundred million years before your arrival.
That contact is worth planning for carefully — with the right timing, the right site, the right guide, and the right framework of responsibility that ensures the encounter leaves the animals and their habitat exactly as it found them.
Mapache Tours coordinates Costa Rica’s finest sea turtle experiences with the local knowledge, the community relationships, and the conservation commitment that these animals deserve. Begin planning at mapachetours.com — where Costa Rica’s most significant wildlife encounters start.
The Mapache Tours Team — Costa Rica’s Finest Local Tour Operator.
This guide reflects Mapache Tours’ operational knowledge of Costa Rica’s sea turtle nesting calendar and site management protocols as of May 2026. Nesting seasons, site access protocols, and community programme availability are subject to annual variation and regulatory change. All sea turtle experiences coordinated by Mapache Tours are conducted in full compliance with Costa Rica’s wildlife protection legislation and the site-specific management protocols of each nesting location. Confirm current site conditions and nesting activity with the Mapache Tours planning team at the time of booking.
