When to plant Sweet corn in Montana
In spring, from May 10 – June 15 in Billings to May 20 – June 1 in Kalispell.
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 |
|---|---|---|
| Belgrade | May 20 – June 1 | June 1 – July 1 |
| Billings | May 10 – June 15 | June 1 – July 10 |
| Bozeman | May 20 – June 1 | June 1 – July 1 |
| Butte-Silver Bow (balance) | Not listed | Not listed |
| Great Falls | May 10 – June 1 | June 1 – July 1 |
| Helena | May 10 – June 1 | June 1 – July 1 |
| Kalispell | May 20 – June 1 | Not listed |
| Missoula | May 10 – June 1 | 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 sweet corn.