What Day Is Mardi Gras 2025 Usa. The official start of carnival season is marked by twelfth night, which is jan. Mardi gras day is more popularly known as fat tuesday and that falls on march 4, 2025.

With 12th night on jan. Mardi gras day is celebrated with a public holiday in alabama and louisiana the day before the christian season of lent begins, and its festive.