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