Wilmington, MA frost dates
Last spring frostApr 25median date
First fall frostOct 17median date
Growing season175 daysfrost-free
Hardiness zone6bZone 6b
How Wilmington compares
- In 8 years out of 10, the last spring frost in Wilmington falls between April 13 and May 8, a 25-day window. The first fall frost falls between October 3 and November 1.
- The median last frost is 2 days earlier than the Massachusetts median of Apr 27.
- Its 175-day growing season is longer than 58% of the 510 Massachusetts places with a regular frost season (state median 169 days).
- The last frost is typical for zone 6b, where the median is Apr 22.
- The weather station records an average of 134 nights a year at or below 32°F.
- Compared with Lowell, MA, 15 km away, the last frost here is 5 days earlier than there and the growing season is 12 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 13 |
| 50% (median) | April 25 |
| 10% (safe for tender plants) | May 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 3 |
| 50% (median) | October 17 |
| 90% (late) | November 1 |
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 Wilmington, MA
Wilmington, MA frost dates — last frost Apr 25, first frost Oct 17, zone 6b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Jan 31 to Feb 14Transplant outside: Mar 28 to Apr 11
Start indoors: Feb 14 to Feb 28Transplant outside: May 9 to May 23
Start indoors: Feb 14 to Feb 28Transplant outside: May 9 to May 23
Start indoors: Feb 28 to Mar 14Transplant outside: May 2 to May 16
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 4 to Apr 18Sow outdoors: Mar 28 to May 2Plant for fall: Aug 22 to Sep 19
Start indoors: Feb 28 to Mar 14Transplant outside: Mar 28 to Apr 11Sow outdoors: Mar 28 to Apr 11Plant for fall: Aug 8 to Aug 29
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 11 to Aug 1
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 4 to Apr 18Plant for fall: Jul 11 to Aug 1
Start indoors: Feb 28 to Mar 14Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 11 to Aug 1
Start indoors: Mar 14 to Mar 28Transplant outside: May 16 to May 30Sow outdoors: May 16 to May 30
Start indoors: Mar 14 to Mar 28Transplant outside: May 2 to May 16
Sow outdoors: Mar 14 to Apr 4Plant for fall: Jul 25 to Aug 15
Sow outdoors: Mar 14 to Apr 4Plant for fall: Aug 22 to Sep 12
Sow outdoors: Mar 21 to May 2Plant for fall: Sep 5 to Sep 26
Start indoors: Mar 28 to Apr 4Transplant outside: May 9 to May 16Sow outdoors: May 2 to May 16Plant for fall: Aug 1 to Aug 15
Start indoors: Mar 28 to Apr 4Sow outdoors: May 2 to May 16Plant for fall: Aug 8 to Aug 22
Start indoors: Mar 28 to Apr 4Sow outdoors: May 2 to May 16
Start indoors: Mar 28 to Apr 4Transplant outside: May 9 to May 23
Sow outdoors: Apr 4 to May 2Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 4 to May 2Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 4 to Apr 25
Sow outdoors: Apr 11 to May 9Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 11 to May 2Plant for fall: Aug 22 to Sep 12
Sow outdoors: May 2 to May 23Plant for fall: Aug 1 to Aug 15
Sow outdoors: May 2 to May 16
Transplant outside: May 9 to May 30
Plant for fall: Oct 3 to Nov 7
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Wilmington, MA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 31 – Feb 14 | Mar 28 – Apr 11 | — | — |
| Peppers | Feb 14 – Feb 28 | May 9 – May 23 | — | — |
| Eggplant | Feb 14 – Feb 28 | May 9 – May 23 | — | — |
| Tomatoes | Feb 28 – Mar 14 | May 2 – May 16 | — | — |
| Lettuce | Feb 28 – Mar 14 | Apr 4 – Apr 18 | Mar 28 – May 2 | Aug 22 – Sep 19 |
| Kale | Feb 28 – Mar 14 | Mar 28 – Apr 11 | Mar 28 – Apr 11 | Aug 8 – Aug 29 |
| Broccoli | Feb 28 – Mar 14 | Apr 11 – Apr 25 | — | Jul 11 – Aug 1 |
| Cabbage | Feb 28 – Mar 14 | Apr 4 – Apr 18 | — | Jul 11 – Aug 1 |
| Cauliflower | Feb 28 – Mar 14 | Apr 11 – Apr 25 | — | Jul 11 – Aug 1 |
| Okra | Mar 14 – Mar 28 | May 16 – May 30 | May 16 – May 30 | — |
| Basil | Mar 14 – Mar 28 | May 2 – May 16 | — | — |
| Peas | — | — | Mar 14 – Apr 4 | Jul 25 – Aug 15 |
| Spinach | — | — | Mar 14 – Apr 4 | Aug 22 – Sep 12 |
| Radishes | — | — | Mar 21 – May 2 | Sep 5 – Sep 26 |
| Cucumbers | Mar 28 – Apr 4 | May 9 – May 16 | May 2 – May 16 | Aug 1 – Aug 15 |
| Zucchini & Summer Squash | Mar 28 – Apr 4 | — | May 2 – May 16 | Aug 8 – Aug 22 |
| Winter Squash & Pumpkins | Mar 28 – Apr 4 | — | May 2 – May 16 | — |
| Melons & Watermelon | Mar 28 – Apr 4 | May 9 – May 23 | — | — |
| Carrots | — | — | Apr 4 – May 2 | Jul 25 – Aug 8 |
| Beets | — | — | Apr 4 – May 2 | Aug 8 – Aug 22 |
| Potatoes | — | — | Apr 4 – Apr 25 | — |
| Swiss Chard | — | — | Apr 11 – May 9 | Aug 8 – Aug 22 |
| Cilantro | — | — | Apr 11 – May 2 | Aug 22 – Sep 12 |
| Green Beans | — | — | May 2 – May 23 | Aug 1 – Aug 15 |
| Sweet Corn | — | — | May 2 – May 16 | — |
| Sweet Potatoes | — | May 9 – May 30 | — | — |
| Garlic | — | — | — | Oct 3 – Nov 7 |
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 Reading, MA weather station, 5 km away (elevation 112 ft (34 m)).
Frost dates near Wilmington
- Pinehurst Apr 27 · Oct 13
- Burlington Apr 25 · Oct 17
- Reading Apr 25 · Oct 17
- Tewksbury Apr 13 · Oct 28
- North Reading Apr 25 · Oct 17
- Billerica Apr 27 · Oct 13
- Nutting Lake Apr 27 · Oct 13
- Woburn Apr 25 · Oct 17
- North Billerica Apr 30 · Oct 10
- Andover Apr 13 · Oct 28
Frequently asked questions
When is the last frost in Wilmington, MA?
The median last spring frost in Wilmington, MA is April 25. There is still about a 10% chance of frost after May 8, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Wilmington, MA?
The median first fall frost is October 17, with about a 10% chance of frost before October 3.
How long is the growing season in Wilmington, MA?
About 175 days between the median last spring frost and first fall frost.
What planting zone is Wilmington, MA?
Wilmington, MA is in USDA hardiness zone 6b.