Public holidays
1640, USA, Colorado
| # | Date | Public holiday |
|---|---|---|
| 1 | Sunday, January 1, 1640 | New Year's Day |
| Monday, January 2, 1640 | New Year's Day (observance) | |
| 2 | Wednesday, February 22, 1640 | Washington's Birthday |
| Friday, March 30, 1640 | César Chávez Day (observance) | |
| 3 | Saturday, March 31, 1640 | César Chávez Day |
| 4 | Wednesday, May 30, 1640 | Memorial Day |
| 5 | Wednesday, July 4, 1640 | Independence Day |
| 6 | Monday, September 3, 1640 | Labor Day |
| 7 | Tuesday, December 25, 1640 | Christmas |