The World's Largest Sea Turtle Nests in Costa Rica

Leatherback turtles in Costa Rica nest on both the Pacific and Caribbean coasts, but the two populations tell genuinely different stories. The Pacific population has collapsed by roughly 98 percent over three decades, while the Caribbean population, though also declining, has held on considerably better under decades of dedicated beach protection, a contrast worth understanding before planning a trip around either coast.

The Sea Turtle Conservancy has monitored Caribbean leatherback nesting at Tortuguero and nearby beaches for decades. The Leatherback Trust focuses its long-term research on the Pacific population at Playa Grande, where the species' crisis is most severe. Our guide to Pacific coast beaches covers the Tamarindo region in more depth for travelers focused on that side of the country specifically.

The Ocean Journey Back to the Nesting Beach

Female leatherbacks return to nest on the same beach where they themselves hatched, navigating thousands of miles of open ocean using a homing instinct scientists still do not fully understand. That fidelity to a specific beach is part of what makes habitat protection so directly effective, since a protected nesting site benefits the same returning females across their entire reproductive life, sometimes spanning several decades of periodic nesting visits.

Why Leatherbacks Arrive at Night

Nesting under cover of darkness reduces exposure to daytime heat and predators during the vulnerable process of digging a nest and laying eggs, a process that can take over an hour from start to finish. That nighttime timing is also why responsible viewing rules focus so heavily on light discipline, since artificial light can disorient a nesting female or cause her to abandon the attempt entirely, undoing what may already be a multi-hour effort just as it nears completion.

Caribbean and Pacific Nesting Sites

Pacific leatherbacks nest near Tamarindo and Playa Grande roughly October through February, a population researchers have documented in serious, ongoing decline. Caribbean leatherbacks nest at Tortuguero, Pacuare, and the Gandoca-Manzanillo Wildlife Refuge on a nearly opposite calendar, generally February through July, a rookery large enough to rank among the more significant leatherback nesting sites in the Western Hemisphere, and one that has responded measurably well to sustained conservation investment.

Our overview of ecotourism activities across Costa Rica covers both coasts in more depth, useful for planning a trip around whichever population's season aligns with available travel dates.

Rules around Guided Beach Visits

Guided nesting beach visits on both coasts follow strict rules: no white light or flash photography, small group sizes, and an experienced guide who coordinates with beach patrols to locate a nesting female before bringing visitors close. Those rules exist specifically because artificial light and human disturbance have been directly linked to lower nesting success across multiple studies, making strict enforcement a genuine conservation measure rather than an inconvenience imposed on visitors.

Our Animal Welfare Policy reflects these same standards, treated as non-negotiable for any turtle nesting excursion we help arrange.

Threats Facing the World's Largest Sea Turtle

Leatherbacks face pressure from coastal development and light pollution near nesting beaches, accidental capture in fishing gear far from shore, and historically severe egg poaching that decades of beach patrols have worked to reduce substantially. Research at Gandoca specifically documented poaching rates falling from nearly total loss to a small fraction of nests annually once consistent nightly patrols began, a measurable success that continues to inform conservation strategy elsewhere in the country.

Our roundup of adventurous activities in Costa Rica covers a few of the conservation-focused excursions built around this same decades-long patrol effort.

When the Camera Should Stay Away

Flash photography risks disrupting a nesting attempt badly enough to end it before completion, which is why cameras stay put away entirely during the most sensitive parts of the process on both coasts. Guides generally ask visitors to simply witness the moment rather than document it, treating the sighting as an experience rather than a photo opportunity.

Travel to Costa Rica's Shore and Witness the Leatherbacks Return

Leatherback turtles in Costa Rica offer two very different windows into the same species' story, a Pacific population in genuine crisis and a Caribbean population holding on more successfully under sustained protection.

Gondwana Ecotours can build a nesting beach visit into either coast's itinerary, setting honest expectations about sighting likelihood on both the Pacific and Caribbean sides. Our broader look at ecotourism in Costa Rica covers how this decades-long conservation effort connects to the country's wider approach.

For more details about what is included in our itineraries, please visit our tour pages before booking.

Leatherback sightings are never guaranteed on either coast, and the Pacific population in particular remains critically endangered. Download our travel details for the most accurate picture of what the Costa Rica: Secluded Wildlife Adventure itinerary actually includes.