Last frost date in Mason City, Iowa
April 29
Average last frost in spring. In an early year (1 in 10) it's over by April 14; in a late year (1 in 10) it comes after May 9.
October 7
Average first frost in fall. 1 year in 10 it comes by September 25.
Source: NOAA U.S. Climate Normals 1991–2020, station Mason City (USC00135230), 1.1 miles from Mason City, elevation 1,105 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 14 | Apr 29 | May 9 |
| First frost in fall | Sept 25 | Oct 7 | Oct 21 |
Frost-free days in an average year: 161
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 7 | Sept 30 |
| Frost (32°F) | Every year | Apr 29 | Oct 7 |
| Hard freeze (28°F) | Every year | Apr 18 | Oct 18 |
Nights at 32°F or colder in an average year: 161
What to plant now in Mason City
- Spring planting calendar for an average last frost around April 30 Mason City: April 29
- Fall planting calendar for an average first frost around October 10 Mason City: 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
- Waterloo 62 mi · last frost Apr 27
- Fort Dodge 66 mi · last frost Apr 28
- Marshalltown 78 mi · last frost Apr 28
- Ames 80 mi · last frost Apr 26
- Boone 83 mi · last frost Apr 28
Updated