Day Date Month Holiday Wednesday 1 Jan New Year's Day Wednesday 12 Feb Makha Bucha Day Monday 7 Apr Substitution for Chakri Memorial Day (Sunday 6 Apr 2025) Monday 14 Apr Songkran Festival Tuesday 15 Apr Songkran Festival Monday 5 May Substitution for Coronation Day (Sunday 4 May 2025) Friday 9 May Royal Ploughing Ceremony Day Monday 12 May Substitution for Visakha Bucha Day (Sunday 11 May 2025) Tuesday 3 Jun H.M. Queen Suthida Bajrasudhabimalalakshana's Birthday Thursday 10 Jul Asarnha Bucha Day Friday 11 Jul Buddhist Lent Day Monday 28 Jul H.M. King Maha Vajiralongkorn Phra Vajiraklaochaoyuhua?s Birthday Tuesday 12 Aug H.M. Queen Sirikit The Queen Mother's Birthday / Mother's Day Monday 13 Oct H.M. King Bhumibol Adulyadej the Great Memorial Day Thursday 23 Oct H.M. King Chulalongkorn the Great Memorial Day Friday 5 Dec H.M. King Bhumibol Adulyadej The Great's Birthday / National Day / Father's Day Wednesday 10 Dec Constitution Day Wednesday 31 Dec New Year's Eve Remark: *Subject to Change According to the Cabinet.