As Costa Rica is a tropical climate there are mosquitoes year round. However, they are more prevalent between the months of May through October. There are not many mosquitoes in high altitude destinations such as Poas Volcano, Monteverde, San Gerardo de Dota, and other mountain destinations due to cool overnight temperatures. Mosquitoes are more common in beach areas.
Mosquitoes are most active around dusk and dawn. Prevent your risk of being bit by closing doors and unscreened windows between 4 PM and 8 AM. Use insect repellent with 30 - 50% DEET. You can also reduce your risk of exposure to mosquitoes by wearing long pants, a long sleeve shirt, hat and socks and shoes.
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