Last frost date in Waterloo, Iowa
April 27
Average last frost in spring. In an early year (1 in 10) it's over by April 11; in a late year (1 in 10) it comes after May 10.
October 10
Average first frost in fall. 1 year in 10 it comes by September 26.
Source: NOAA U.S. Climate Normals 1991–2020, station Waterloo Muni AP (USW00094910), 5 miles from Waterloo, elevation 868 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Cedar Falls and Waverly, so their frost dates are the same as Waterloo's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 11 | Apr 27 | May 10 |
| First frost in fall | Sept 26 | Oct 10 | Oct 21 |
Frost-free days in an average year: 165
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 6 | Sept 30 |
| Frost (32°F) | Every year | Apr 27 | Oct 10 |
| Hard freeze (28°F) | Every year | Apr 16 | Oct 20 |
Nights at 32°F or colder in an average year: 151
What to plant now in Waterloo
- Spring planting calendar for an average last frost around April 30 Waterloo: April 27
- Fall planting calendar for an average first frost around October 10 Waterloo: October 10
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
- Marshalltown 42 mi · last frost Apr 28
- Marion 50 mi · last frost Apr 28
- Cedar Rapids 50 mi · last frost Apr 27
- Mason City 62 mi · last frost Apr 29
- Newton 65 mi · last frost Apr 22
Updated