September 11 Holidays & Observances
1 holiday observed on September 11 in the 2026–2030 window.
Floating holidays on September 11
These observances only land on September 11 in certain years.
| Holiday | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|
| Rosh Hashanah | Sep 11 · Fri | — | — | — | — |
View all September holidays
See every observance across September in one monthly calendar.
September calendar →September 11 — quick answers
- How many holidays fall on September 11?
- In the 2026–2030 window, 1 holiday and observance falls on September 11: Rosh Hashanah.
- What is celebrated on September 11?
- September 11 is home to Rosh Hashanah. Each one has its own page with history and a live countdown.
- Are any September 11 holidays public holidays?
- None of the observances on September 11 are US federal holidays; they are celebrated informally by people, brands and communities.