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Costa Rica’s “green season” (roughly May to November on the Pacific side) brings lush landscapes, fewer tourists and lower prices. It also brings afternoon downpours that transform roads. Here’s how to drive it safely.
Quick answer: Drive in the morning, be off the road by mid-afternoon, avoid gravel mountain roads and river crossings in September–October, and check for closures on Route 32 (Braulio Carrillo) and mountain passes before leaving.
When is the rainy season?
- Pacific side and Central Valley: about May–November. Mornings are often sunny; heavy rain usually arrives in the afternoon. September and October are the wettest.
- Caribbean side: its own pattern — rain can come any time, with drier spells often in September–October and February–April.
What changes on the road
- Visibility. Tropical downpours can cut visibility to a few meters. Slow down, turn on low beams and hazards if you stop, and never stop in a curve.
- Landslides (derrumbes). Mountain roads such as Route 32 through Braulio Carrillo and the passes to Arenal and Monteverde can close temporarily.
- Potholes. Water hides potholes; a puddle may be much deeper than it looks.
- Gravel turns to mud. Roads like Tilarán–Monteverde and the approaches to Nosara become slippery; a 4×4 makes a real difference.
- Rivers rise fast. Coastal routes on the Nicoya Peninsula can become impassable within an hour of rain upstream.
Never cross a flooded road or river you can’t see the bottom of. Rental insurance doesn’t cover water damage, and cars are swept away every year. Read our river crossing guide.
How to plan your days
- Leave early — ideally by 8 am — and aim to arrive by 2 pm.
- Check Waze for reported closures and ask your hotel about local roads.
- Keep the tank above half and carry water and snacks in case of delays.
- Build a buffer day before your flight home.
Which car for the green season?
Paved routes are fine in any car. If your itinerary includes gravel, upgrade: an SUV instead of a sedan, or a 4×4 instead of an SUV. Our route checker shows which roads are gravel.
Bottom line
The rainy season is a great time to visit — just shift your driving to the mornings, respect rivers, and give yourself buffer time.
Frequently asked questions
Is it safe to drive in Costa Rica during the rainy season?
Yes, with precautions: drive in the morning, avoid gravel mountain roads and rivers in September–October, and check for closures.
What are the worst months to drive in Costa Rica?
September and October on the Pacific side, when rain is heaviest.
Keep reading
River Crossings in Costa Rica: When (Not) to Drive Through Water
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