All 52 Weeks of 2021
| Week | Starts (Mon) | Ends (Sun) | Federal holidays |
|---|---|---|---|
| 1 | Jan 4, 2021 | Jan 10, 2021 | — |
| 2 | Jan 11, 2021 | Jan 17, 2021 | — |
| 3 | Jan 18, 2021 | Jan 24, 2021 | MLK Day |
| 4 | Jan 25, 2021 | Jan 31, 2021 | — |
| 5 | Feb 1, 2021 | Feb 7, 2021 | — |
| 6 | Feb 8, 2021 | Feb 14, 2021 | — |
| 7 | Feb 15, 2021 | Feb 21, 2021 | Presidents' Day |
| 8 | Feb 22, 2021 | Feb 28, 2021 | — |
| 9 | Mar 1, 2021 | Mar 7, 2021 | — |
| 10 | Mar 8, 2021 | Mar 14, 2021 | — |
| 11 | Mar 15, 2021 | Mar 21, 2021 | — |
| 12 | Mar 22, 2021 | Mar 28, 2021 | — |
| 13 | Mar 29, 2021 | Apr 4, 2021 | — |
| 14 | Apr 5, 2021 | Apr 11, 2021 | — |
| 15 | Apr 12, 2021 | Apr 18, 2021 | — |
| 16 | Apr 19, 2021 | Apr 25, 2021 | — |
| 17 | Apr 26, 2021 | May 2, 2021 | — |
| 18 | May 3, 2021 | May 9, 2021 | — |
| 19 | May 10, 2021 | May 16, 2021 | — |
| 20 | May 17, 2021 | May 23, 2021 | — |
| 21 | May 24, 2021 | May 30, 2021 | — |
| 22 | May 31, 2021 | Jun 6, 2021 | Memorial Day |
| 23 | Jun 7, 2021 | Jun 13, 2021 | — |
| 24 | Jun 14, 2021 | Jun 20, 2021 | Juneteenth |
| 25 | Jun 21, 2021 | Jun 27, 2021 | — |
| 26 | Jun 28, 2021 | Jul 4, 2021 | Independence Day |
| 27 | Jul 5, 2021 | Jul 11, 2021 | — |
| 28 | Jul 12, 2021 | Jul 18, 2021 | — |
| 29 | Jul 19, 2021 | Jul 25, 2021 | — |
| 30 | Jul 26, 2021 | Aug 1, 2021 | — |
| 31 | Aug 2, 2021 | Aug 8, 2021 | — |
| 32 | Aug 9, 2021 | Aug 15, 2021 | — |
| 33 | Aug 16, 2021 | Aug 22, 2021 | — |
| 34 | Aug 23, 2021 | Aug 29, 2021 | — |
| 35 | Aug 30, 2021 | Sep 5, 2021 | — |
| 36 | Sep 6, 2021 | Sep 12, 2021 | Labor Day |
| 37 | Sep 13, 2021 | Sep 19, 2021 | — |
| 38 | Sep 20, 2021 | Sep 26, 2021 | — |
| 39 | Sep 27, 2021 | Oct 3, 2021 | — |
| 40 | Oct 4, 2021 | Oct 10, 2021 | — |
| 41 | Oct 11, 2021 | Oct 17, 2021 | Columbus Day |
| 42 | Oct 18, 2021 | Oct 24, 2021 | — |
| 43 | Oct 25, 2021 | Oct 31, 2021 | — |
| 44 | Nov 1, 2021 | Nov 7, 2021 | — |
| 45 | Nov 8, 2021 | Nov 14, 2021 | Veterans Day |
| 46 | Nov 15, 2021 | Nov 21, 2021 | — |
| 47 | Nov 22, 2021 | Nov 28, 2021 | Thanksgiving |
| 48 | Nov 29, 2021 | Dec 5, 2021 | — |
| 49 | Dec 6, 2021 | Dec 12, 2021 | — |
| 50 | Dec 13, 2021 | Dec 19, 2021 | — |
| 51 | Dec 20, 2021 | Dec 26, 2021 | Christmas Day |
| 52 | Dec 27, 2021 | Jan 2, 2022 | New Year's Day |
2021 Week Numbers FAQ
How many weeks are in 2021?
2021 has 52 ISO weeks. Week 1 runs from Monday, January 4, 2021 to Sunday, January 10, 2021, and week 52 ends on Sunday, January 2, 2022.
What week number is January 1, 2021?
January 1, 2021 is a Friday, so it belongs to week 53 of 2020. Week 1 of 2021 starts on Monday, January 4, 2021.
How are ISO week numbers counted?
ISO 8601 weeks start on Monday. Week 1 is the week that contains the first Thursday of the year, which is the same as the week that contains January 4. A year has 52 weeks, or 53 when it starts on a Thursday (or on a Wednesday in a leap year).
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