When is week 51?
In 2026, week 51 runs from Monday, December 14, 2026 to Sunday, December 20, 2026.
It starts in 72 days.
Week 51 in other years
| Year | Starts | Ends |
|---|---|---|
| 2025 | Mon, Dec 15, 2025 | Sun, Dec 21, 2025 |
| 2026 | Mon, Dec 14, 2026 | Sun, Dec 20, 2026 |
| 2027 | Mon, Dec 20, 2027 | Sun, Dec 26, 2027 |
| 2028 | Mon, Dec 18, 2028 | Sun, Dec 24, 2028 |
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Questions & answers
What dates are in week 51?
In 2026, week 51 is December 14, 2026 to December 20, 2026.
How are week numbers counted?
We use ISO 8601 week numbers: weeks start on Monday, and week 1 is the week that contains the first Thursday of the year.