New Harbor, ME frost dates
Last spring frostApr 28median date
First fall frostOct 21median date
Growing season176 daysfrost-free
Hardiness zone6aZone 6a
How New Harbor compares
- In 8 years out of 10, the last spring frost in New Harbor falls between April 16 and May 9, a 23-day window. The first fall frost falls between October 5 and November 4.
- The median last frost is 8 days earlier than the Maine median of May 6.
- Its 176-day growing season is longer than 87% of the 457 Maine places with a regular frost season (state median 154 days).
- The last frost is typical for zone 6a, where the median is Apr 29.
- The weather station records an average of 148 nights a year at or below 32°F.
- Compared with Portland, ME, 64 km away, the last frost here is 2 days later than there and the growing season is 4 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 16 |
| 50% (median) | April 28 |
| 10% (safe for tender plants) | May 9 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 5 |
| 50% (median) | October 21 |
| 90% (late) | November 4 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for New Harbor, ME
New Harbor, ME frost dates — last frost Apr 28, first frost Oct 21, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 3 to Feb 17Transplant outside: Mar 31 to Apr 14
Start indoors: Feb 17 to Mar 3Transplant outside: May 12 to May 26
Start indoors: Feb 17 to Mar 3Transplant outside: May 12 to May 26
Start indoors: Mar 3 to Mar 17Transplant outside: May 5 to May 19
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 7 to Apr 21Sow outdoors: Mar 31 to May 5Plant for fall: Aug 26 to Sep 23
Start indoors: Mar 3 to Mar 17Transplant outside: Mar 31 to Apr 14Sow outdoors: Mar 31 to Apr 14Plant for fall: Aug 12 to Sep 2
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 14 to Apr 28Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 7 to Apr 21Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 3 to Mar 17Transplant outside: Apr 14 to Apr 28Plant for fall: Jul 15 to Aug 5
Start indoors: Mar 17 to Mar 31Transplant outside: May 19 to Jun 2Sow outdoors: May 19 to Jun 2
Start indoors: Mar 17 to Mar 31Transplant outside: May 5 to May 19
Sow outdoors: Mar 17 to Apr 7Plant for fall: Jul 29 to Aug 19
Sow outdoors: Mar 17 to Apr 7Plant for fall: Aug 26 to Sep 16
Sow outdoors: Mar 24 to May 5Plant for fall: Sep 9 to Sep 30
Start indoors: Mar 31 to Apr 7Transplant outside: May 12 to May 19Sow outdoors: May 5 to May 19Plant for fall: Aug 5 to Aug 19
Start indoors: Mar 31 to Apr 7Sow outdoors: May 5 to May 19Plant for fall: Aug 12 to Aug 26
Start indoors: Mar 31 to Apr 7Sow outdoors: May 5 to May 19
Start indoors: Mar 31 to Apr 7Transplant outside: May 12 to May 26
Sow outdoors: Apr 7 to May 5Plant for fall: Jul 29 to Aug 12
Sow outdoors: Apr 7 to May 5Plant for fall: Aug 12 to Aug 26
Sow outdoors: Apr 7 to Apr 28
Sow outdoors: Apr 14 to May 12Plant for fall: Aug 12 to Aug 26
Sow outdoors: Apr 14 to May 5Plant for fall: Aug 26 to Sep 16
Sow outdoors: May 5 to May 26Plant for fall: Aug 5 to Aug 19
Sow outdoors: May 5 to May 19
Transplant outside: May 12 to Jun 2
Plant for fall: Oct 7 to Nov 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in New Harbor, ME
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 3 – Feb 17 | Mar 31 – Apr 14 | — | — |
| Peppers | Feb 17 – Mar 3 | May 12 – May 26 | — | — |
| Eggplant | Feb 17 – Mar 3 | May 12 – May 26 | — | — |
| Tomatoes | Mar 3 – Mar 17 | May 5 – May 19 | — | — |
| Lettuce | Mar 3 – Mar 17 | Apr 7 – Apr 21 | Mar 31 – May 5 | Aug 26 – Sep 23 |
| Kale | Mar 3 – Mar 17 | Mar 31 – Apr 14 | Mar 31 – Apr 14 | Aug 12 – Sep 2 |
| Broccoli | Mar 3 – Mar 17 | Apr 14 – Apr 28 | — | Jul 15 – Aug 5 |
| Cabbage | Mar 3 – Mar 17 | Apr 7 – Apr 21 | — | Jul 15 – Aug 5 |
| Cauliflower | Mar 3 – Mar 17 | Apr 14 – Apr 28 | — | Jul 15 – Aug 5 |
| Okra | Mar 17 – Mar 31 | May 19 – Jun 2 | May 19 – Jun 2 | — |
| Basil | Mar 17 – Mar 31 | May 5 – May 19 | — | — |
| Peas | — | — | Mar 17 – Apr 7 | Jul 29 – Aug 19 |
| Spinach | — | — | Mar 17 – Apr 7 | Aug 26 – Sep 16 |
| Radishes | — | — | Mar 24 – May 5 | Sep 9 – Sep 30 |
| Cucumbers | Mar 31 – Apr 7 | May 12 – May 19 | May 5 – May 19 | Aug 5 – Aug 19 |
| Zucchini & Summer Squash | Mar 31 – Apr 7 | — | May 5 – May 19 | Aug 12 – Aug 26 |
| Winter Squash & Pumpkins | Mar 31 – Apr 7 | — | May 5 – May 19 | — |
| Melons & Watermelon | Mar 31 – Apr 7 | May 12 – May 26 | — | — |
| Carrots | — | — | Apr 7 – May 5 | Jul 29 – Aug 12 |
| Beets | — | — | Apr 7 – May 5 | Aug 12 – Aug 26 |
| Potatoes | — | — | Apr 7 – Apr 28 | — |
| Swiss Chard | — | — | Apr 14 – May 12 | Aug 12 – Aug 26 |
| Cilantro | — | — | Apr 14 – May 5 | Aug 26 – Sep 16 |
| Green Beans | — | — | May 5 – May 26 | Aug 5 – Aug 19 |
| Sweet Corn | — | — | May 5 – May 19 | — |
| Sweet Potatoes | — | May 12 – Jun 2 | — | — |
| Garlic | — | — | — | Oct 7 – Nov 11 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Westport Island, ME weather station, 16 km away (elevation 89 ft (27 m)).
Frost dates near New Harbor
- Chamberlain Apr 27 · Oct 18
- Pemaquid Apr 28 · Oct 21
- South Bristol Apr 28 · Oct 21
- Round Pond Apr 27 · Oct 18
- East Boothbay Apr 28 · Oct 21
- Boothbay Harbor Apr 28 · Oct 21
- Walpole Apr 27 · Oct 18
- Bristol Apr 27 · Oct 18
- Boothbay Apr 28 · Oct 21
- West Boothbay Harbor Apr 28 · Oct 21
Frequently asked questions
When is the last frost in New Harbor, ME?
The median last spring frost in New Harbor, ME is April 28. There is still about a 10% chance of frost after May 9, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in New Harbor, ME?
The median first fall frost is October 21, with about a 10% chance of frost before October 5.
How long is the growing season in New Harbor, ME?
About 176 days between the median last spring frost and first fall frost.
What planting zone is New Harbor, ME?
New Harbor, ME is in USDA hardiness zone 6a.