Checking current alerts… View NWS forecast and alerts.
Will it freeze in Bangor in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Mon, Nov 9: 32°F (Mon, Nov 9, 6:00 PM EST to Tue, Nov 10, 6:00 AM EST).
Tonight: forecast low 56°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 56°F Above 36°F · Slight Chance Light Rain then Areas Of Fog
- Fri, Nov 6 47°F Above 36°F · Light Rain
- Sat, Nov 7 41°F Above 36°F · Light Rain
- Sun, Nov 8 35°F Frost possible · Chance Light Rain
- Mon, Nov 9 32°F Freeze · Partly Cloudy
- Tue, Nov 10 33°F Frost possible · Partly Cloudy
- Wed, Nov 11 27°F Hard freeze · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Bangor
The median first fall hard-freeze date (28°F) is October 17, from NOAA’s 1991–2020 Climate Normals at Bangor Intl Airport. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | May 5 · May 17 · May 31 | Sep 13 · Sep 25 · Oct 7 | 129 days |
| 32°F freeze | Apr 24 · May 4 · May 17 | Sep 23 · Oct 4 · Oct 21 | 152 days |
| 28°F hard freeze | Apr 11 · Apr 23 · May 4 | Oct 1 · Oct 17 · Nov 2 | 175 days |
Average high temperature by month
1991–2020 normals at Bangor Intl Airport
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Bangor, ME come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Bangor Intl Airport (station USW00014606, elevation 148 ft), 2.6 mi from Bangor. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Bangor
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Brewer, ME | 4.3 mi | May 4 | Oct 4 |
| Old Town, ME | 8.7 mi | May 13 | Sep 28 |
| Ellsworth, ME | 23 mi | May 8 | Oct 9 |
| Belfast, ME | 30 mi | May 7 | Oct 5 |
| Waterville, ME | 47 mi | May 2 | Oct 10 |
| Rockland, ME | 52 mi | Apr 27 | Oct 19 |
| Augusta, ME | 58 mi | Apr 27 | Oct 16 |
| Gardiner, ME | 66 mi | May 1 | Oct 11 |
| Bath, ME | 81 mi | May 10 | Oct 6 |
| Lewiston, ME | 85 mi | Apr 25 | Oct 19 |
Frequently asked questions
When is the last frost in Bangor?
On average, the last spring frost (32°F) in Bangor is around May 4. In about 1 year in 10 it comes after May 17, and in 9 years in 10 it comes after April 24.
When is the first frost in Bangor?
The first fall frost (32°F) usually arrives around October 4. There’s a 10% chance of a freeze by September 23 and a 90% chance by October 21.
Can it frost in Bangor after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 17.
What growing zone is Bangor?
Bangor is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 04401. See growing zones in Maine.
More: all Maine frost dates · Maine growing zones · UV index today in Bangor · frost vs. freeze