Frost Dates for Bangor, ME
In Bangor, ME, the average last spring frost is around May 4 and the average first fall frost around Oct 4, for a growing season of about 152 days. For frost-tender plants, wait until May 17, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Bangor Intl. Airport, ME weather station, 3 miles away, elevation 148 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | May 17 | Sep 23 |
| 20% | May 13 | Sep 27 |
| 30% | May 9 | Sep 30 |
| 40% | May 7 | Oct 2 |
| 50% | May 4 | Oct 4 |
| 60% | May 2 | Oct 7 |
| 70% | Apr 30 | Oct 10 |
| 80% | Apr 27 | Oct 14 |
| 90% | Apr 24 | Oct 21 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | May 17 | Sep 25 |
| Frost / freeze (32°F) | May 4 | Oct 4 |
| Hard freeze (28°F) | Apr 23 | Oct 17 |
Planting calendar for Bangor
Transplant May 11 – May 25
Transplant May 18 – Jun 1
Transplant May 18 – Jun 1
Transplant May 11 – May 25
Sow or transplant May 11 – May 25
Sow or transplant May 11 – May 25
Sow or transplant May 18 – Jun 1
Sow or transplant Apr 6 – Apr 20
Fall sowing Aug 9 – Sep 6
Fall sowing Aug 9 – Aug 30
Fall sowing Jul 26 – Aug 9
Sow or transplant Apr 6 – Apr 20
Fall sowing Jul 26 – Aug 23
Transplant Apr 20 – May 4
Fall sowing Jul 12 – Jul 26
Transplant Apr 13 – Apr 27
Fall sowing Jul 12 – Jul 26
Fall sowing Jul 12 – Jul 26
Fall sowing Aug 23 – Sep 13
Fall sowing Jul 26 – Aug 9
Plant Apr 6 – Apr 20
Based on the average last frost (May 4) and first frost (Oct 4). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.