When is the last frost in Bangor, ME?

The average (50% probability) last spring frost in Bangor is May 4, based on NOAA 1991–2020 normals. A 1-in-10 risk remains until May 17.

When is the first frost in Bangor?

The average first fall frost in Bangor is October 4, with a growing season of about 152 days.

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Bangor, Maine frost dates

Average last spring frost: May 4. Average first fall frost: October 4. That gives a growing season of about 152 days. For frost-tender plants, a safer planting date is May 17, after which a freeze happens in only 1 year in 10.

Last frost (50%)

May 4

1-in-10 risk after May 17

First frost (50%)

Oct 4

1-in-10 risk before Sep 23

Growing season

152 days

median frost-free days

Hard freeze (28°F)

Apr 23

median last 28°F in spring

Frost risk by date

Chance of frost	Spring: frost after	Fall: frost before
90%	April 24	October 21
70%	April 30	October 10
50%	May 4	October 4
30%	May 9	September 30
10%	May 17	September 23

Read the spring column like this: there is a 10% chance of a 32°F freeze after May 17. These are NOAA probabilities for the Bangor International Airport weather station (USW00014606, elevation 45 m), 1991–2020.

Bangor vegetable planting calendar

Dates count from the 50% last-frost date (May 4). For tomatoes, peppers and other frost-tender crops, waiting until the 10% date (May 17) is the cautious choice.

Crop	Start seeds indoors	Plant out
Beans	Apr 13	May 11 (usually sown directly in the garden)
Broccoli	Feb 23	Apr 6
Brussels sprouts	Feb 23	Apr 6
Cabbage	Feb 16	Mar 30
Cauliflower	Mar 9	Apr 20
Sweet corn	Apr 6	May 4 (usually sown directly in the garden)
Cucumbers	Apr 20	May 11
Kale	Feb 16	Mar 30
Leeks	Jan 19	Mar 30
Lettuce	Mar 16	Apr 20
Melons	Apr 27	May 18
Onions	Jan 12	Mar 23 (from seed; sets and transplants go out at the same time)
Peas	Mar 9	Apr 6 (usually sown directly in the garden)
Peppers	Mar 23	May 18
Squash	Apr 27	May 18
Tomatoes	Mar 9	May 4

Offsets from Oregon State University Extension's seed-starting table. "Plant out" means transplant, or sow directly for crops usually grown from seed.

Fall frost and season extension

The first fall freeze usually arrives around October 4. There's a 1-in-10 chance it comes before September 23. Harvest tender crops such as basil, tomatoes, peppers and squash before then, or cover them on cold nights. Cool-season crops like kale, cabbage and Brussels sprouts handle light frost, and often taste sweeter after it. A hard freeze (28°F) typically comes around October 17.

Nearby cities

City	Last frost (50%)	First frost (50%)	Distance
Portland, ME	Apr 26	Oct 15	~173 km
Manchester, NH	Apr 21	Oct 19	~292 km
Boston, MA	Apr 4	Nov 9	~321 km
Burlington, VT	Apr 29	Oct 15	~343 km
Worcester, MA	Apr 23	Oct 21	~370 km
Providence, RI	Apr 11	Oct 30	~399 km

More: all Maine frost dates