Best Time to Visit Corcovado National Park — Month by Month Guide

December and January — Peak Season Begins

December marks the start of the dry season and the beginning of Costa Rica's peak tourist period. Rainfall drops significantly on the Osa Peninsula — mornings are crisp, trails are at their driest, and the Pacific boat crossings are calm and fast. Wildlife activity is high as the forest comes back from its end-of-wet-season depletion.

January opens the first humpback whale window — Northern Hemisphere humpbacks arrive from their North Pacific feeding grounds to calve in the warm waters off the Osa Peninsula. The chances of a sighting on the Uvita boat crossing to San Pedrillo are excellent, and dedicated whale-watching tours from Uvita operate alongside the Corcovado departures.

• Trail conditions: dry, firm — easiest hiking of the year
• Boat crossings: calm Pacific — minimal sea sickness risk
• Whale sightings: Northern Hemisphere humpbacks arrive from January
• Book ahead: December–January dates fill fast — reserve 3–4 weeks in advance

February and March — Prime Conditions

February and March are widely considered the best months to visit Corcovado. Rainfall is minimal, visibility in the forest is clearer as deciduous trees lose some foliage in spots, and the January–March whale window is fully open. February has the most consistently calm Pacific crossings of the entire year.

March is the warmest and driest month on the Osa Peninsula — temperatures in the forest reach 32–34°C in the midday hours, so the early departure (typically 6:30 am) is an advantage, getting you into the shade of the primary forest before the heat peaks.

• Best month: February for weather, March for whale probability
• Wildlife activity: high — early mornings extremely productive for birding and mammals
• Crowds: highest of the year — book 4–6 weeks ahead for dry-season February/March dates
• Heat: pack a reusable water bottle — midday temperatures exceed 32°C

April — Shoulder Dry Season

April is the transition month — still dry-season conditions through mid-April, then the first rains of the wet season begin arriving. April remains a strong choice for Corcovado, with lower crowds than February and March, good trail conditions in the first half of the month, and some of the best birding of the year as resident species become more vocal before nesting.

The whale window from January to March technically closes by late March/early April, though stragglers are occasionally spotted through April.

• First half of April: still dry — good conditions, fewer crowds than March
• Second half of April: first rains begin — trails start to get muddy
• Birding: excellent — pre-nesting activity peaks in April
• Price: lower than peak (Feb–Mar) — good value month

May and June — Early Rains, Quieter Trails

The rainy season begins in May on the Osa Peninsula, with rainfall typically arriving as afternoon and evening storms rather than all-day rain. Morning tours (all Corcovado tours depart early) typically operate in clear or partly cloudy conditions, with rain arriving in the afternoon after you've returned to Uvita or Drake Bay.

May and June have the lowest tourist numbers of the year — you may be on the trail with just your group, without another touring party in sight. The forest is intensely green after the first rains, and the contrast for photography is dramatic. Prices for accommodation in the area drop significantly.

• Rain pattern: afternoon and evening — morning tours typically dry
• Crowds: lowest of the year — effectively private trail experience
• Photography: extraordinary green season saturation after first rains
• Price: accommodation rates at yearly lows — combine with longer Osa Peninsula stay

July and October — Second Whale Window Peak

July opens the second humpback whale window on the Osa Peninsula — Southern Hemisphere whales arrive from their Antarctic feeding grounds, travelling north to calve in the warm Golfo Dulce and open Pacific waters off Uvita. This is the larger of the two annual windows in terms of whale numbers, and the Uvita boat crossing during this period is one of the best non-dedicated whale-watching opportunities on the Pacific coast.

October represents peak wildlife activity in the rainy-season forest. The moisture and heat have accumulated through the long wet season, and the forest is at maximum productivity — fungi, insects, and the animals that eat them are all at peak density.

• Whale peak: July–October for Southern Hemisphere humpbacks — numbers highest in this window
• Wildlife: October is peak month for reptile and amphibian activity on rainy-season trails
• Boat crossings: swells can be larger in September–October — take sea sickness precautions
• Book ahead: rainy-season whale dates are popular among experienced wildlife travellers

August, September, and November — Deep Rainy Season

August through September is the wettest period on the Osa Peninsula — rainfall can be continuous for days at a time, and the Pacific can develop heavy swells. Tours operate unless conditions make the crossing unsafe, but the risk of a partial-rain day is highest here.

November is the transition back to dry season — the second whale window closes by late November, but the forest remains lush and crowds stay low. Trails begin to dry and firm up through the month, and December's crisp dry conditions feel dramatically different from the preceding wet months.

• August–September: heaviest rainfall of the year — prepare for wet trail conditions throughout the hike
• Tour operations: tours run in rain but may be cancelled if Pacific crossings are unsafe
• Trail conditions: muddiest months — rubber boots strongly recommended over hiking shoes
• November: transition month — drying out fast, good shoulder option

What to Expect Each Month

Use this reference to match your travel dates to conditions, whale seasons, and crowd levels: