Mardi Gras Dates 2025. 6 marking the start of carnival, that means the 2025 season will last 58 days,. Mardi gras in 2025 is on tuesday, the 4th of march (4/3/2025).
Mardi gras was declared a legal state holiday within louisiana in 1875. 6, and concludes on mardi gras, tuesday, march 4.