There are only a handful of vineyards on Ireland– its very hard to make consistently good wine year-to-year, and the yields are low. However, with the influences of global warming, thing could tip in the winemakers favor. (Ireland is predicted to have less rain, and higher summer temperatures in the coming years).

Desmond Castle, In Kinsale contains a museum of winemaking. (Looks like this attraction hasn’t been open since 2017.)

In the 1970s, Longueville House owner Michael O’Callahan planted grapes, but at some point they gave up–they moved onto cider at some point, which they sell commercially.

James McWalter, author of the essay “The Feasibility of Ireland Becoming a Wine Producing Country due to Climate Change” (2016) spots Wexford and Waterford as most amenable. He observes that “Ireland currently does not have sufficient GDDs [Growing Degree Days] for viticulture”. For comparison–the Finger Lakes wine region has 2,500 growing degree days (the sum total of degrees above 50 F between April 1 and October 30), the region has a growing environment slightly warmer than France’s Loire Valley or California’s central coast, even though winter temperatures are much colder. (GDD for wine is generally calculated using a base temp of 50 degrees F/10 degrees F, below which, it has been determined that no vine growth takes place. (Link to Cornell Cooperative Extension GDD Calculator.) You can calculate Growing Degree Days in Ireland using this online calculator. The nearest weather station that works with it is at Cork Airport– it’s symbol is EICK. Results from this station are: 203 for 2020; 273 for 2021.

The Past, Present and Future of Winemaking in Ireland provides a general overview (ca 2017).