When to plant Collard greens in Montana
In spring, from Apr 1 – June 1 in Billings to May 20 – June 1 in Butte-Silver Bow (balance).
In fall, from May 15 – June 15 in Belgrade to July 1 – Aug 1 in Billings.
Dates are for setting out plants. USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Belgrade | May 10 – June 1 | May 15 – June 15 |
| Billings | Apr 1 – June 1 | July 1 – Aug 1 |
| Bozeman | May 10 – June 1 | May 15 – June 15 |
| Butte-Silver Bow (balance) | May 20 – June 1 | May 15 – June 15 |
| Great Falls | Apr 15 – June 1 | June 15 – July 15 |
| Helena | Apr 15 – June 1 | June 15 – July 15 |
| Kalispell | May 10 – June 1 | May 15 – June 15 |
| Missoula | Apr 15 – June 1 | June 15 – July 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 collards.