Public holidays
1431, USA, Montana
| # | Date | Public holiday |
|---|---|---|
| 1 | Saturday, 1 January 1431 | New Year's Day |
| Friday, 11 February 1431 | Lincoln's Birthday (observance) | |
| 2 | Saturday, 12 February 1431 | Lincoln's Birthday |
| 3 | Tuesday, 22 February 1431 | Washington's Birthday/Mardi gras day |
| 4 | Monday, 30 May 1431 | Memorial Day |
| 5 | Monday, 4 July 1431 | Independence Day |
| 6 | Monday, 5 September 1431 | Labor Day |
| 7 | Tuesday, 8 November 1431 | Election Day |
| 8 | Sunday, 25 December 1431 | Christmas |
| Monday, 26 December 1431 | Christmas (observance) |