When to plant Radishes in Montana
In spring, from Mar 20 – May 10 in Billings to May 15 – June 1 in Butte-Silver Bow (balance).
In fall, from May 1 – Aug 1 in Butte-Silver Bow (balance) to July 15 – Sept 15 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 | May 1 – June 15 | June 1 – Aug 15 |
| Billings | Mar 20 – May 10 | July 15 – Sept 15 |
| Bozeman | May 1 – June 15 | June 1 – Aug 15 |
| Butte-Silver Bow (balance) | May 15 – June 1 | May 1 – Aug 1 |
| Great Falls | Apr 1 – June 1 | July 1 – Sept 1 |
| Helena | Apr 1 – June 1 | July 1 – Sept 1 |
| Kalispell | May 1 – June 15 | May 1 – Aug 1 |
| Missoula | Apr 1 – June 1 | July 1 – Sept 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 radishes.