# Frost dates for Portland, ME (04108)

**Do this (Safe, 2026-11-02):** Frost season started Oct 2. Keep covers ready for cold nights.

| Risk | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Safe (1 in 10 years later) | May 7 | Oct 2 | 148 |
| Median | Apr 26 | Oct 15 | 172 |
| Bold (9 in 10 years later) | Apr 16 | Oct 30 | 197 |

Frost = 32°F. Station: Portland Intl Jetport, ME, 6 mi away.

## Next nights (NWS overnight low)

- 2026-11-01: 47°F — Go (tonight)
- 2026-11-02: 51°F — Go
- 2026-11-03: 51°F — Go
- 2026-11-04: 53°F — Go
- 2026-11-05: 55°F — Go
- 2026-11-06: 51°F — Go
- 2026-11-07: 48°F — Go

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 Portland Intl Jetport, ME (6 mi, about your height). Not endorsed by NOAA. Nights: National Weather Service.

Page: https://frostdatecalculator.com/s/maine · JSON: https://frostdatecalculator.com/s/maine?format=json