Do I need a passport or visa to enter?
Switzerland extends visa-free entry to U.S. citizens staying in Switzerland for up to 90 days (consecutive or combined, within a six-month period) for tourist or business purposes. The passport should be valid for at least three months beyond the period of stay. Switzerland is a party to the Schengen Agreement, which allows for free travel within a multi-country zone of Europe. Switzerland does not have a bilateral agreement with the United States which would allow a U.S. citizen to stay longer than 90 days within the Schengen area in any 180 day period. Thus, when you travel to Switzerland, you should make sure that you have not yet exhausted the 90 days within a 180 day period of legal stay in the Schengen area since your first entry into the Schengen area, regardless of any bilateral agreement. This applies also to Schengen departures via Swiss airports. If you exceed the 90 day stay, you risk being fined or even banned from entering the Schengen area again for some time.
We advise you to obtain more information online at the Embassy of Switzerland or in person at 2900Cathedral Avenue, N.W., Washington, D.C. 20008, telephone (202) 745-7900, or a Swiss Consulate General in Atlanta, Chicago, Los Angeles, New York, or San Francisco prior to your travel if you plan to exceed the 90-day limit within 180 days in the Schengen area.