Westminster, MA frost dates
Last spring frostMay 2median date
First fall frostOct 13median date
Growing season164 daysfrost-free
Hardiness zone6aZone 6a
How Westminster compares
- In 8 years out of 10, the last spring frost in Westminster falls between April 19 and May 16, a 27-day window. The first fall frost falls between October 1 and October 30.
- The median last frost is 5 days later than the Massachusetts median of Apr 27.
- Its 164-day growing season is longer than 38% of the 510 Massachusetts places with a regular frost season (state median 169 days).
- The last frost is typical for zone 6a, where the median is Apr 29.
- The weather station records an average of 152 nights a year at or below 32°F.
- Compared with Worcester, MA, 31 km away, the last frost here is 9 days later than there and the growing season is 17 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 19 |
| 50% (median) | May 2 |
| 10% (safe for tender plants) | May 16 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 1 |
| 50% (median) | October 13 |
| 90% (late) | October 30 |
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 Westminster, MA
Westminster, MA frost dates — last frost May 2, first frost Oct 13, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 7 to Feb 21Transplant outside: Apr 4 to Apr 18
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Feb 21 to Mar 7Transplant outside: May 16 to May 30
Start indoors: Mar 7 to Mar 21Transplant outside: May 9 to May 23
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Sow outdoors: Apr 4 to May 9Plant for fall: Aug 18 to Sep 15
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 4 to Apr 18Sow outdoors: Apr 4 to Apr 18Plant for fall: Aug 4 to Aug 25
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 11 to Apr 25Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 7 to Mar 21Transplant outside: Apr 18 to May 2Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 21 to Apr 4Transplant outside: May 23 to Jun 6Sow outdoors: May 23 to Jun 6
Start indoors: Mar 21 to Apr 4Transplant outside: May 9 to May 23
Sow outdoors: Mar 21 to Apr 11Plant for fall: Jul 21 to Aug 11
Sow outdoors: Mar 21 to Apr 11Plant for fall: Aug 18 to Sep 8
Sow outdoors: Mar 28 to May 9Plant for fall: Sep 1 to Sep 22
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 23Sow outdoors: May 9 to May 23Plant for fall: Jul 28 to Aug 11
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23Plant for fall: Aug 4 to Aug 18
Start indoors: Apr 4 to Apr 11Sow outdoors: May 9 to May 23
Start indoors: Apr 4 to Apr 11Transplant outside: May 16 to May 30
Sow outdoors: Apr 11 to May 9Plant for fall: Jul 21 to Aug 4
Sow outdoors: Apr 11 to May 9Plant for fall: Aug 4 to Aug 18
Sow outdoors: Apr 11 to May 2
Sow outdoors: Apr 18 to May 16Plant for fall: Aug 4 to Aug 18
Sow outdoors: Apr 18 to May 9Plant for fall: Aug 18 to Sep 8
Sow outdoors: May 9 to May 30Plant for fall: Jul 28 to Aug 11
Sow outdoors: May 9 to May 23
Transplant outside: May 16 to Jun 6
Plant for fall: Sep 29 to Nov 3
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Westminster, MA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 7 – Feb 21 | Apr 4 – Apr 18 | — | — |
| Peppers | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Eggplant | Feb 21 – Mar 7 | May 16 – May 30 | — | — |
| Tomatoes | Mar 7 – Mar 21 | May 9 – May 23 | — | — |
| Lettuce | Mar 7 – Mar 21 | Apr 11 – Apr 25 | Apr 4 – May 9 | Aug 18 – Sep 15 |
| Kale | Mar 7 – Mar 21 | Apr 4 – Apr 18 | Apr 4 – Apr 18 | Aug 4 – Aug 25 |
| Broccoli | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jul 7 – Jul 28 |
| Cabbage | Mar 7 – Mar 21 | Apr 11 – Apr 25 | — | Jul 7 – Jul 28 |
| Cauliflower | Mar 7 – Mar 21 | Apr 18 – May 2 | — | Jul 7 – Jul 28 |
| Okra | Mar 21 – Apr 4 | May 23 – Jun 6 | May 23 – Jun 6 | — |
| Basil | Mar 21 – Apr 4 | May 9 – May 23 | — | — |
| Peas | — | — | Mar 21 – Apr 11 | Jul 21 – Aug 11 |
| Spinach | — | — | Mar 21 – Apr 11 | Aug 18 – Sep 8 |
| Radishes | — | — | Mar 28 – May 9 | Sep 1 – Sep 22 |
| Cucumbers | Apr 4 – Apr 11 | May 16 – May 23 | May 9 – May 23 | Jul 28 – Aug 11 |
| Zucchini & Summer Squash | Apr 4 – Apr 11 | — | May 9 – May 23 | Aug 4 – Aug 18 |
| Winter Squash & Pumpkins | Apr 4 – Apr 11 | — | May 9 – May 23 | — |
| Melons & Watermelon | Apr 4 – Apr 11 | May 16 – May 30 | — | — |
| Carrots | — | — | Apr 11 – May 9 | Jul 21 – Aug 4 |
| Beets | — | — | Apr 11 – May 9 | Aug 4 – Aug 18 |
| Potatoes | — | — | Apr 11 – May 2 | — |
| Swiss Chard | — | — | Apr 18 – May 16 | Aug 4 – Aug 18 |
| Cilantro | — | — | Apr 18 – May 9 | Aug 18 – Sep 8 |
| Green Beans | — | — | May 9 – May 30 | Jul 28 – Aug 11 |
| Sweet Corn | — | — | May 9 – May 23 | — |
| Sweet Potatoes | — | May 16 – Jun 6 | — | — |
| Garlic | — | — | — | Sep 29 – Nov 3 |
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 Ashburnham, MA weather station, 8 km away (elevation 1,109 ft (338 m)).
ZIP codes in Westminster: 01441 01473
Frost dates near Westminster
- Gardner May 2 · Oct 13
- Fitchburg May 1 · Oct 9
- Hubbardston May 12 · Oct 1
- East Templeton May 6 · Oct 1
- Princeton May 12 · Oct 1
- Ashburnham May 5 · Oct 7
- Templeton May 6 · Oct 1
- Leominster Apr 29 · Oct 11
- Baldwinville May 6 · Oct 1
- Lunenburg Apr 29 · Oct 11
Frequently asked questions
When is the last frost in Westminster, MA?
The median last spring frost in Westminster, MA is May 2. There is still about a 10% chance of frost after May 16, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Westminster, MA?
The median first fall frost is October 13, with about a 10% chance of frost before October 1.
How long is the growing season in Westminster, MA?
About 164 days between the median last spring frost and first fall frost.
What planting zone is Westminster, MA?
Westminster, MA is in USDA hardiness zone 6a.