# Frost dates for Casper, WY (82601)

**Do this (Safe, 2026-11-02):** Frost season started Sep 14. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | May 24 | Sep 14 | 113 |
| Median | May 10 | Sep 29 | 142 |
| Bold (9 in 10 years later) | Apr 30 | Oct 12 | 165 |

Frost = 32°F. Station: Casper Wwtp, WY, 2 mi away.

## Next nights (NWS overnight low)

- 2026-11-02: 29°F — Cover (tonight)
- 2026-11-03: 28°F — Cover
- 2026-11-04: 28°F — Cover
- 2026-11-05: 30°F — Cover
- 2026-11-06: 30°F — Cover
- 2026-11-07: 29°F — Cover
- 2026-11-08: 36°F — Cover

Go above 40°F · Wait 37–40°F · Cover 36°F or less · Freeze 28°F or less.

Source: Frost dates: NOAA NCEI U.S. Climate Normals 1991–2020, station Casper Wwtp, WY (2 mi, 52 ft lower than you). Not endorsed by NOAA. Nights: National Weather Service.

Page: https://frostdatecalculator.com/p/wy/casper · JSON: https://frostdatecalculator.com/p/wy/casper?format=json