The CDC recommends an insect repellent that contains at least 20% DEET. You can buy repellent at most grocery and convenience stores in Costa Rica, but unfortunately they mostly carry ones that have 15% DEET. This may work for a short amount of time but a higher concentration will last longer.

Yes, bug spray is an absolute necessity for any traveler heading to Costa Rica in 2026. Because of the country's incredible biodiversity and its tropical climate—consisting of both rainforests and cloud forests—mosquitoes and other biting insects are prevalent year-round. Beyond the annoyance of itchy bites, mosquitoes in the region can carry tropical diseases such as Dengue fever and Zika, making prevention a matter of health. It is highly recommended to use a repellent containing at least 20–30% DEET or Picaridin, especially during the "green season" when rain increases. For those visiting more remote eco-lodges or hiking in national parks like Corcovado or Manuel Antonio, applying repellent over your clothes or wearing permethrin-treated gear is also a smart strategy. While high-end resorts may provide some protection, you will certainly need your own supply for any outdoor activities or evening dining.