You must have a valid passport to enter Ireland. U.S. citizens can enter visa-free for tourism or business stays of up to 90 days. There is no minimum passport validity requirement for U.S. citizens entering Ireland.
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Irish citizens require an ESTA or visa to enter the US. In advance of travel, an ESTA (Electronic System for Travel Authorisation) application can be made to determine the eligibility of visitors to travel to the US under the Visa Waiver Program (VWP). A valid passport is required for travel to the US.
While you're in Ireland: ensure that your belongings, including your passport, are secure at all times. don't keep your passport and other types of ID in the same place and carry a photocopy rather than the original when you are out. avoid showing signs of affluence or wearing expensive jewellery.
The best time to visit Ireland is during the shoulder season (May, September and October). During these months, you'll find less crowds along with cheaper flight and accommodation prices. These months experience mild temperatures, plenty of dry spells and there's a packed festival calendar.
Ireland - Level 1: Exercise Normal PrecautionsExercise normal precautions in Ireland. Read the country information page for additional information on travel to Ireland.