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