# Frost dates for Butte-Silver Bow, MT (59701)

**Do this (Safe, 2026-11-02):** Frost season started Aug 24. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | Jul 1 | Aug 24 | 54 |
| Median | Jun 13 | Sep 5 | 84 |
| Bold (9 in 10 years later) | May 27 | Sep 19 | 115 |

Frost = 32°F. Station: Butte Bert Mooney AP, MT, 9 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 31°F — Cover (tonight)
- 2026-11-02: 26°F — Cover
- 2026-11-03: 30°F — Cover
- 2026-11-04: 28°F — Cover
- 2026-11-05: 28°F — Cover
- 2026-11-06: 27°F — Cover
- 2026-11-07: 30°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 Butte Bert Mooney AP, MT (9 mi, 387 ft lower than you). Not endorsed by NOAA. Nights: National Weather Service.

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