Last frost date in Marshalltown, Iowa
April 28
Average last frost in spring. In an early year (1 in 10) it's over by April 13; in a late year (1 in 10) it comes after May 11.
October 7
Average first frost in fall. 1 year in 10 it comes by September 22.
Source: NOAA U.S. Climate Normals 1991–2020, station Marshalltown (USC00135198), 2.3 miles from Marshalltown, elevation 870 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 13 | Apr 28 | May 11 |
| First frost in fall | Sept 22 | Oct 7 | Oct 21 |
Frost-free days in an average year: 162
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 7 | Sept 28 |
| Frost (32°F) | Every year | Apr 28 | Oct 7 |
| Hard freeze (28°F) | Every year | Apr 17 | Oct 18 |
Nights at 32°F or colder in an average year: 152
What to plant now in Marshalltown
- Spring planting calendar for an average last frost around April 30 Marshalltown: April 28
- Fall planting calendar for an average first frost around October 10 Marshalltown: October 7
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Iowa
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