
Photo: Panegyrics of Granovetter, CC BY-SA 2.0
WildlifeRestricted access
Olive ridley arribadas at Ostional
- Entry
- $13.56
- Hours
- 5:00–21:00
- Booking
- Not stated
Mass nesting of olive ridley turtles: once or twice a month, all year, between 15,000 and 200,000 females come ashore along about 800 m of beach.
During arribadas you may only enter with an accredited local guide (AGLO or ADIO), paid separately. Flash, bonfires, pets, vehicles and horses are banned on the beach. Dates cannot be predicted exactly: check with the guides a few days ahead.
Source: SINAC – Refugio Nacional de Vida Silvestre Ostional · 2026 · +2
Practical details and sources
- Entry
- Entry: $13.56 for non-residents (SINAC, 2026); the guide is extra, about $25 per person according to a 2025 guide.
- Hours
- Monday to Sunday, 5:00–21:00 (SINAC).
- Booking
- Ostional Local Guides Association: 2682-0428 / 6252-7412; ADIO: 2682-1229 / 6108-1681 (SINAC).
Tip: SINAC says arribadas happen all year; a 2025 guide places tours mainly from May to November. The river crossing between Nosara and Ostional can be impassable after heavy rain. Do not wear reflective clothing.
Nearby: ATVs and horses on Ostional beach (1.5 km) · Playa Nosara (2.2 km) · Nosara biological reserve trails (4.1 km)
Sources: SINAC – Refugio Nacional de Vida Silvestre Ostional · Wikipedia – Ostional Wildlife Refuge · Two Weeks in Costa Rica – Nosara trip planning
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