When to plant Garlic in Montana
In spring, from Mar 15 – Apr 15 in Billings to May 15 – June 1 in Butte-Silver Bow (balance).
In fall: USDA's 1967 table lists garlic as generally spring-planted in every place here. Newer advice from your state's extension service may differ.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring |
|---|---|
| Belgrade | May 1 – 30 |
| Billings | Mar 15 – Apr 15 |
| Bozeman | May 1 – 30 |
| Butte-Silver Bow (balance) | May 15 – June 1 |
| Great Falls | Apr 1 – May 1 |
| Helena | Apr 1 – May 1 |
| Kalispell | May 1 – 30 |
| Missoula | Apr 1 – May 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 garlic.