Frost dates for Billings, Montana
In a typical year, Billings’s last spring frost lands around May 10 and the first fall frost around Oct 1, a growing season of about 144 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 5a.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Apr 26 | Sep 19 |
| 50 percent | May 10 | Oct 1 |
| 90 percent | May 24 | Oct 15 |
A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.
Soil in Billings is typically around 71°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Billings
- Bok choy (Toy Choi)
- Arugula (Astro)
- Mustard greens (Red Giant)
- Tatsoi (Tatsoi)
- Dill (Bouquet)
- Cilantro (Santo)
- Sweet alyssum (Snow Crystals)
- Mâche (Vit)
Timing comes from the same temperature engine the app uses, run against Billings’s normals for today.
Nearby cities
- Bozeman, MT (around May 26 to Sep 22)
- Great Falls, MT (around May 6 to Oct 1)
- Gillette, WY (around May 15 to Oct 1)
- Casper, WY (around May 10 to Sep 29)
- Idaho Falls, ID (around May 9 to Oct 1)
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
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