When to plant Spinach in Montana
In spring, from Mar 20 – Apr 20 in Billings to May 1 – June 15 in Butte-Silver Bow (balance).
In fall, from June 1 – Aug 1 in Belgrade to Aug 1 – Sept 1 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 | Apr 20 – June 15 | June 1 – Aug 1 |
| Billings | Mar 20 – Apr 20 | Aug 1 – Sept 1 |
| Bozeman | Apr 20 – June 15 | June 1 – Aug 1 |
| Butte-Silver Bow (balance) | May 1 – June 15 | June 1 – July 15 |
| Great Falls | Apr 1 – June 15 | July 1 – Aug 15 |
| Helena | Apr 1 – June 15 | July 1 – Aug 15 |
| Kalispell | Apr 20 – June 15 | June 1 – July 15 |
| Missoula | Apr 1 – June 15 | July 1 – Aug 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 spinach.