Bangor, ME planting zone & frost dates
Bangor is in USDA hardiness zone 5a. The last spring frost usually comes around May 4 and the first fall frost around October 4, for a growing season of about 152 days.
Planting calendar for Bangor
Dates are counted from the average last spring frost (May 4) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Mar 9 – Mar 23 Transplant outdoors: May 11 – May 18 |
| Peppers | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: May 18 – May 25 |
| Eggplant | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: May 18 – May 25 |
| Broccoli | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: Apr 6 – Apr 20 |
| Cabbage | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: Apr 6 – Apr 20 |
| Onions (sets) | Plant outdoors: Apr 6 – Apr 20 |
| Peas | Sow outdoors: Mar 23 – Apr 6 |
| Spinach | Sow outdoors: Mar 23 – Apr 6 |
| Lettuce | Sow outdoors: Apr 6 – Apr 20 |
| Carrots | Sow outdoors: Apr 6 – Apr 20 |
| Potatoes | Plant outdoors: Apr 6 – Apr 20 |
| Beans | Sow outdoors: May 11 – May 18 |
| Sweet corn | Sow outdoors: May 11 – May 18 |
| Cucumbers | Sow outdoors: May 11 – May 18 |
| Squash & zucchini | Sow outdoors: May 11 – May 18 |
| Basil | Start seeds indoors: Mar 23 – Apr 6 Transplant outdoors: May 11 – May 18 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 9 (8 weeks before the average first fall frost on Oct 4).
Useful for zone 5a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 24 | May 4 | May 17 |
| First 32°F frost in fall is before | Oct 21 | Oct 4 | Sep 23 |
How to read it: in spring there is a 10% chance of a frost after May 17, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 23. A hard freeze (28°F) usually ends around April 23.
Hardiness zone by ZIP code in Bangor
- 04401 zone 5a
- 04402 zone 5a
Nearby cities
- Waterville zone 5b, last frost May 2
- Augusta zone 5b, last frost Apr 27
- Brunswick zone 5b, last frost May 2
- Lewiston zone 5b, last frost Apr 25
- Auburn zone 5b, last frost Apr 25
- South Portland zone 6a, last frost Apr 26
- Portland zone 6a, last frost Apr 26
- South Portland Gardens zone 6a, last frost Apr 26
Questions
What growing zone is Bangor, ME?
Bangor is in USDA Plant Hardiness Zone 5a (average extreme winter low -20°F to -15°F), according to the USDA 2023 map.
When is the last frost in Bangor?
The average last spring frost (32°F) in Bangor is May 4. There is still a 10% chance of frost until May 17.
When can I plant tomatoes in Bangor?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 11 – May 18. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Bangor Intl Ap, ME (USW00014606), 3.6 km (2.2 mi) from the city center, elevation 45 m, based on 28 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.