When to plant Sweet potatoes in Montana
In spring, May 20 – June 10 in Billings.
In fall, May 20 – June 10 in Billings.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Belgrade | Not listed | Not listed |
| Billings | May 20 – June 10 | May 20 – June 10 |
| Bozeman | Not listed | Not listed |
| Butte-Silver Bow (balance) | Not listed | Not listed |
| Great Falls | Not listed | Not listed |
| Helena | Not listed | Not listed |
| Kalispell | Not listed | Not listed |
| Missoula | Not listed | Not listed |
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 potatoes.