Last frost date in Ottumwa, Iowa
April 23
Average last frost in spring. In an early year (1 in 10) it's over by April 9; in a late year (1 in 10) it comes after May 7.
October 14
Average first frost in fall. 1 year in 10 it comes by September 29.
Source: NOAA U.S. Climate Normals 1991–2020, station Ottumwa Industrial AP (USW00014950), 6 miles from Ottumwa, elevation 842 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 9 | Apr 23 | May 7 |
| First frost in fall | Sept 29 | Oct 14 | Oct 26 |
Frost-free days in an average year: 172
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 3 | Oct 3 |
| Frost (32°F) | Every year | Apr 23 | Oct 14 |
| Hard freeze (28°F) | Every year | Apr 13 | Oct 24 |
Nights at 32°F or colder in an average year: 131
What to plant now in Ottumwa
- Spring planting calendar for an average last frost around April 20 Ottumwa: April 23
- Fall planting calendar for an average first frost around October 10 Ottumwa: October 14
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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