March 31 Holidays & Observances
1 holiday observed on March 31 in the 2026–2030 window.
Floating holidays on March 31
These observances only land on March 31 in certain years.
| Holiday | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|
| Earth Hour | — | — | — | Mar 31 · Sat | — |
View all March holidays
See every observance across March in one monthly calendar.
March calendar →March 31 — quick answers
- How many holidays fall on March 31?
- In the 2026–2030 window, 1 holiday and observance falls on March 31: Earth Hour.
- What is celebrated on March 31?
- March 31 is home to Earth Hour. Each one has its own page with history and a live countdown.
- Are any March 31 holidays public holidays?
- None of the observances on March 31 are US federal holidays; they are celebrated informally by people, brands and communities.