Frost dates in Mapleton, IA
The average last spring frost in Mapleton is around May 2 and the first fall frost is around October 3. That gives Mapleton an average growing season of about 154 days.
Last spring frost
| Early (10% chance after) | April 16 |
|---|---|
| Average (50%) | May 2 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | September 20 |
|---|---|
| Average (50%) | October 3 |
| Late (90% chance before) | October 22 |