Thousands of Olive Ridley Turtles Come Ashore in One of the Year’s Largest Arribadas
One of the largest arribadas of the year began in the early morning hours this morning at the Ostional National Wildlife Refuge in Guanacaste, as thousands of olive ridley sea turtles emerged from the Pacific to nest on the beach long known as their favorite stretch of Costa Rican coastline. Guides and residents alike described this week’s event as among the biggest seen so far in 2026. More turtles were expected to continue arriving through Friday night and into Saturday morning. The spectacle draws both Costa Ricans and tourists eager to watch the turtles come ashore, dig their nests, lay their eggs and return to the sea. That cycle has made Ostional one of the most closely watched nesting sites in the world. The timing fits a well-established seasonal pattern as well as arribadas occur throughout the year at Ostional, but September, October and November typically bring the largest events, when more than 100,000 turtles can come ashore in a single night and a single ar...