When to plant Broccoli and brussels sprouts in Montana
In spring, from Apr 1 – May 1 in Billings to May 20 – June 10 in Butte-Silver Bow (balance).
In fall, from May 1 – June 15 in Belgrade to June 15 – July 15 in Billings.
USDA gives brussels sprouts the same planting dates as broccoli.
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 10 | May 1 – June 15 |
| Billings | Apr 1 – May 1 | June 15 – July 15 |
| Bozeman | May 10 – June 10 | May 1 – June 15 |
| Butte-Silver Bow (balance) | May 20 – June 10 | May 1 – June 1 |
| Great Falls | Apr 15 – June 1 | June 1 – 30 |
| Helena | Apr 15 – June 1 | June 1 – 30 |
| Kalispell | May 10 – June 10 | May 1 – June 1 |
| Missoula | Apr 15 – June 1 | June 1 – 30 |
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. The full USDA table for broccoli.