When to plant Winter squash in Iowa
In fall, June 1 – July 1.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Altoona | — | June 1 – July 1 |
| Ames | — | June 1 – July 1 |
| Ankeny | — | June 1 – July 1 |
| Bettendorf | — | June 1 – July 1 |
| Boone | — | June 1 – July 1 |
| Burlington | — | June 1 – July 1 |
| Carroll | — | June 1 – July 1 |
| Cedar Falls | — | June 1 – July 1 |
| Cedar Rapids | — | June 1 – July 1 |
| Clinton | — | June 1 – July 1 |
| Clive | — | June 1 – July 1 |
| Coralville | — | June 1 – July 1 |
| Council Bluffs | — | June 1 – July 1 |
| Davenport | — | June 1 – July 1 |
| Des Moines | — | June 1 – July 1 |
| Dubuque | — | June 1 – July 1 |
| Fort Dodge | — | June 1 – July 1 |
| Grimes | — | June 1 – July 1 |
| Indianola | — | June 1 – July 1 |
| Iowa City | — | June 1 – July 1 |
| Johnston | — | June 1 – July 1 |
| Le Mars | — | June 1 – 15 |
| Marion | — | June 1 – July 1 |
| Marshalltown | — | June 1 – July 1 |
| Mason City | — | June 1 – July 1 |
| Muscatine | — | June 1 – July 1 |
| Newton | — | June 1 – July 1 |
| North Liberty | — | June 1 – July 1 |
| Norwalk | — | June 1 – July 1 |
| Oskaloosa | — | June 1 – July 1 |
| Ottumwa | — | June 1 – July 1 |
| Pella | — | June 1 – July 1 |
| Pleasant Hill | — | June 1 – July 1 |
| Sioux City | — | June 1 – July 1 |
| Spencer | — | June 1 – 15 |
| Storm Lake | — | June 1 – July 1 |
| Urbandale | — | June 1 – July 1 |
| Waterloo | — | June 1 – July 1 |
| Waukee | — | June 1 – July 1 |
| Waverly | — | June 1 – July 1 |
| West Des Moines | — | June 1 – July 1 |
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for winter squash.