# Frost dates for Duluth, MN (55811)

**Do this (Safe, 2026-11-02):** Frost season started Sep 25. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | Jun 1 | Sep 25 | 116 |
| Median | May 14 | Oct 12 | 151 |
| Bold (9 in 10 years later) | Apr 24 | Oct 26 | 185 |

Frost = 32°F. Station: Duluth Harbor Stn, MN, 2 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 50°F — Go (tonight)
- 2026-11-02: 52°F — Go
- 2026-11-03: 47°F — Go
- 2026-11-04: 43°F — Go
- 2026-11-05: 37°F — Wait
- 2026-11-06: 34°F — Cover
- 2026-11-07: 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 Duluth Harbor Stn, MN (2 mi, 295 ft lower than you). Not endorsed by NOAA. Nights: National Weather Service.

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