Frost dates in Spencer, IA
The average last spring frost in Spencer is around May 4 and the first fall frost is around September 29. That gives Spencer an average growing season of about 148 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 4 |
| Late (90%) | May 18 |
First fall frost
| Early (10%) | September 18 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 16 |