Frost dates for Casper, Wyoming
In a typical year, Casper’s last spring frost lands around May 10 and the first fall frost around Sep 29, a growing season of about 142 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 30 | Sep 14 |
| 50 percent | May 10 | Sep 29 |
| 90 percent | May 24 | Oct 12 |
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 Casper is typically around 72°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Casper
- 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 Casper’s normals for today.
Nearby cities
- Gillette, WY (around May 15 to Oct 1)
- Laramie, WY (around Jun 7 to Sep 4)
- Cheyenne, WY (around May 14 to Oct 1)
- Fort Collins, CO (around May 2 to Oct 7)
- Rapid City, SD (around May 10 to Oct 5)
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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