Passport

U.S. citizens need only a passport to enter Costa Rica and a return plane ticket home or to another country for stays of up to 90 days. Make sure it's up to date. We've received much conflicting information, even within officialdom, about how long your passport must be valid—the official answer is "for the duration of your trip," but government officials, passport officers, and airline check-in agents frequently interpret the rules differently. To be on the safe side, make sure your passport is valid for at least six months.