To enter Portugal as an American, your passport must meet these requirements:

✅ Validity: Your passport must be valid for at least 3 months beyond your planned departure date from the Schengen Area. However, it's recommended to have at least 6 months of validity to avoid issues.

✅ Blank Pages: You should have at least one blank page for entry/exit stamps.

✅ Visa: No visa is required for stays up to 90 days within a 180-day period for tourism, business, or family visits