Frost dates in Marshalltown, IA
The average last spring frost in Marshalltown is around April 6 and the first fall frost is around October 21. That gives Marshalltown an average growing season of about 198 days.
Last spring frost
| Early (10% chance after) | April 1 |
|---|---|
| Average (50%) | April 6 |
| Late (90%) | April 11 |
First fall frost
| Early (10%) | October 7 |
|---|---|
| Average (50%) | October 21 |
| Late (90% chance before) | November 4 |