What validity do I need on my Irish passport for overseas travel?
This depends on where you're travelling to:
Your Irish Passport must be valid up to your date of entry. You will, of course, need a valid passport if you are planning to leave Ireland again.
Your Irish Passport must be valid up to your return date.
Your Irish Passport must be valid up to your return date. As of March 15, 2016, travellers will need an Electronic Travel Authorization (eTA) before they board a flight to Canada. See Citizenship and Immigration Canada for further details.
Your Irish Passport must be valid up to your return date. You must also get an Electronic System for Travel Authorisation (ESTA) under the Visa Waiver Programme, or a visa, for entry into the United States. You can find more information on the US Embassy in Ireland's website.
The passport validity required varies greatly so contact your travel agent or the embassy of the country you are travelling to for the most up-to-date requirements.