Frost dates in Armour, SD
The average last spring frost in Armour is around May 7 and the first fall frost is around September 30. That gives Armour an average growing season of about 146 days.
Last spring frost
| Early (10% chance after) | April 17 |
|---|---|
| Average (50%) | May 7 |
| Late (90%) | May 22 |
First fall frost
| Early (10%) | September 17 |
|---|---|
| Average (50%) | September 30 |
| Late (90% chance before) | October 14 |