December 15 Holidays & Observances
1 holiday observed on December 15 in the 2026–2030 window.
Floating holidays on December 15
These observances only land on December 15 in certain years.
| Holiday | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|
| National Ugly Christmas Sweater Day | — | — | Dec 15 · Fri | — | — |
View all December holidays
See every observance across December in one monthly calendar.
December calendar →December 15 — quick answers
- How many holidays fall on December 15?
- In the 2026–2030 window, 1 holiday and observance falls on December 15: National Ugly Christmas Sweater Day.
- What is celebrated on December 15?
- December 15 is home to National Ugly Christmas Sweater Day. Each one has its own page with history and a live countdown.
- Are any December 15 holidays public holidays?
- None of the observances on December 15 are US federal holidays; they are celebrated informally by people, brands and communities.