# Frost dates for Flagstaff, AZ (86001)

**Do this (Safe, 2026-11-02):** Frost season started Sep 16. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | Jun 19 | Sep 16 | 89 |
| Median | Jun 4 | Sep 28 | 116 |
| Bold (9 in 10 years later) | May 21 | Oct 9 | 141 |

Frost = 32°F. Station: Flagstaff Pulliam AP, AZ, 4 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 30°F — Cover (tonight)
- 2026-11-02: 27°F — Cover
- 2026-11-03: 30°F — Cover
- 2026-11-04: 28°F — Cover
- 2026-11-05: 29°F — Cover
- 2026-11-06: 30°F — Cover
- 2026-11-07: 29°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 Flagstaff Pulliam AP, AZ (4 mi, 56 ft higher than you). Not endorsed by NOAA. Nights: National Weather Service.

Page: https://frostdatecalculator.com/p/az/flagstaff · JSON: https://frostdatecalculator.com/p/az/flagstaff?format=json