# Frost dates for Ann Arbor, MI (48103)

**Do this (Safe, 2026-11-02):** Frost season started Sep 28. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | May 20 | Sep 28 | 131 |
| Median | May 5 | Oct 10 | 158 |
| Bold (9 in 10 years later) | Apr 21 | Oct 24 | 186 |

Frost = 32°F. Station: Ann Arbor SE, MI, 3 mi away.

## Next nights (NWS overnight low)

- 2026-11-02: 56°F — Go (tonight)
- 2026-11-03: 61°F — Go
- 2026-11-04: 51°F — Go
- 2026-11-05: 46°F — Go
- 2026-11-06: 40°F — Wait
- 2026-11-07: 37°F — Wait
- 2026-11-08: 37°F — Wait

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 Ann Arbor SE, MI (3 mi, about your height). Not endorsed by NOAA. Nights: National Weather Service.

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