Lúghnasadh is also known as Lughnasa (Modern Irish), Lugnasad (Old Irish), Lúnasa (Reformed Modern Irish), Lúnasdain, Lúnasdal, Lunasduinn (Scots Gaelic) and Laa Luanisdyn or Laa Luanys (in Manx), Lammas Day, Garland Day, Domnash Chrom Dubh, Crom Dubh Sunday, Billberry Sunday (Domthnach na bhFraochóga in Ireland), and Fraugham Sunday.

It marks the end of summer and beginning of fall, and was was traditionally up to a month long, held between July 15 and August 15. Nowadays, it is usually celebrated on or near August 1. (based on material from "The Wheel of the Year at Muin Mound Grove, ADF" by Rev. Skip Ellison).