Public holidays
1580, USA, Montana
| # | Date | Public holiday |
|---|---|---|
| 1 | Tuesday, 1 January 1580 | New Year's Day |
| 2 | Monday, 21 January 1580 | Martin Luther King Day |
| 3 | Tuesday, 12 February 1580 | Lincoln's Birthday |
| 4 | Monday, 18 February 1580 | Washington's Birthday |
| 5 | Monday, 26 May 1580 | Memorial Day |
| 6 | Friday, 4 July 1580 | Independence Day |
| 7 | Monday, 1 September 1580 | Labor Day |
| 8 | Monday, 13 October 1580 | Columbus Day |
| 9 | Tuesday, 4 November 1580 | Election Day |
| 10 | Tuesday, 11 November 1580 | Veterans Day |
| 11 | Thursday, 27 November 1580 | Thanksgiving |
| 12 | Thursday, 25 December 1580 | Christmas |