Last frost date in Sioux City, Iowa
April 29
Average last frost in spring. In an early year (1 in 10) it's over by April 15; 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 24.
Source: NOAA U.S. Climate Normals 1991–2020, station Sioux City Ang (USC00137702), 6.9 miles from Sioux City, elevation 1,100 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 15 | Apr 29 | May 11 |
| First frost in fall | Sept 24 | 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 29 |
| Frost (32°F) | Every year | Apr 29 | Oct 7 |
| Hard freeze (28°F) | Every year | Apr 19 | Oct 18 |
Nights at 32°F or colder in an average year: 160
What to plant now in Sioux City
- Spring planting calendar for an average last frost around April 30 Sioux City: April 29
- Fall planting calendar for an average first frost around October 10 Sioux 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
- Le Mars 23 mi · last frost Apr 30
- Storm Lake 62 mi · last frost Apr 25
- Spencer 77 mi · last frost May 1
- Carroll 83 mi · last frost Apr 27
- Council Bluffs 91 mi · last frost Apr 18
Updated