Westbrook, CT frost dates
Last spring frostApr 6median date
First fall frostNov 17median date
Growing season225 daysfrost-free
Hardiness zone7aZone 7a
How Westbrook compares
- In 8 years out of 10, the last spring frost in Westbrook falls between March 25 and May 2, a 38-day window. The first fall frost falls between October 31 and December 4.
- The median last frost is 15 days earlier than the Connecticut median of Apr 21.
- Its 225-day growing season is longer than 97% of the 267 Connecticut places with a regular frost season (state median 178 days).
- The last frost is 10 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 73 nights a year at or below 32°F.
- Compared with New Haven, CT, 39 km away, the last frost here is 11 days earlier than there and the growing season is 32 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 25 |
| 50% (median) | April 6 |
| 10% (safe for tender plants) | May 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 31 |
| 50% (median) | November 17 |
| 90% (late) | December 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 Westbrook, CT
Westbrook, CT frost dates — last frost Apr 6, first frost Nov 17, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 12 to Jan 26Transplant outside: Mar 9 to Mar 23
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Jan 26 to Feb 9Transplant outside: Apr 20 to May 4
Start indoors: Feb 9 to Feb 23Transplant outside: Apr 13 to Apr 27
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Sow outdoors: Mar 9 to Apr 13Plant for fall: Sep 22 to Oct 20
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 9 to Mar 23Sow outdoors: Mar 9 to Mar 23Plant for fall: Sep 8 to Sep 29
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Aug 11 to Sep 1
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 16 to Mar 30Plant for fall: Aug 11 to Sep 1
Start indoors: Feb 9 to Feb 23Transplant outside: Mar 23 to Apr 6Plant for fall: Aug 11 to Sep 1
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11
Start indoors: Feb 23 to Mar 9Transplant outside: Apr 13 to Apr 27
Sow outdoors: Feb 23 to Mar 16Plant for fall: Aug 25 to Sep 15
Sow outdoors: Feb 23 to Mar 16Plant for fall: Sep 22 to Oct 13
Sow outdoors: Mar 2 to Apr 13Plant for fall: Oct 6 to Oct 27
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to Apr 27Sow outdoors: Apr 13 to Apr 27Plant for fall: Sep 1 to Sep 15
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27Plant for fall: Sep 8 to Sep 22
Start indoors: Mar 9 to Mar 16Sow outdoors: Apr 13 to Apr 27
Start indoors: Mar 9 to Mar 16Transplant outside: Apr 20 to May 4
Sow outdoors: Mar 16 to Apr 13Plant for fall: Aug 25 to Sep 8
Sow outdoors: Mar 16 to Apr 13Plant for fall: Sep 8 to Sep 22
Sow outdoors: Mar 16 to Apr 6
Sow outdoors: Mar 23 to Apr 20Plant for fall: Sep 8 to Sep 22
Sow outdoors: Mar 23 to Apr 13Plant for fall: Sep 22 to Oct 13
Sow outdoors: Apr 13 to May 4Plant for fall: Sep 1 to Sep 15
Sow outdoors: Apr 13 to Apr 27
Transplant outside: Apr 20 to May 11
Plant for fall: Nov 3 to Dec 8
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Westbrook, CT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 12 – Jan 26 | Mar 9 – Mar 23 | — | — |
| Peppers | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Eggplant | Jan 26 – Feb 9 | Apr 20 – May 4 | — | — |
| Tomatoes | Feb 9 – Feb 23 | Apr 13 – Apr 27 | — | — |
| Lettuce | Feb 9 – Feb 23 | Mar 16 – Mar 30 | Mar 9 – Apr 13 | Sep 22 – Oct 20 |
| Kale | Feb 9 – Feb 23 | Mar 9 – Mar 23 | Mar 9 – Mar 23 | Sep 8 – Sep 29 |
| Broccoli | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Aug 11 – Sep 1 |
| Cabbage | Feb 9 – Feb 23 | Mar 16 – Mar 30 | — | Aug 11 – Sep 1 |
| Cauliflower | Feb 9 – Feb 23 | Mar 23 – Apr 6 | — | Aug 11 – Sep 1 |
| Okra | Feb 23 – Mar 9 | Apr 27 – May 11 | Apr 27 – May 11 | — |
| Basil | Feb 23 – Mar 9 | Apr 13 – Apr 27 | — | — |
| Peas | — | — | Feb 23 – Mar 16 | Aug 25 – Sep 15 |
| Spinach | — | — | Feb 23 – Mar 16 | Sep 22 – Oct 13 |
| Radishes | — | — | Mar 2 – Apr 13 | Oct 6 – Oct 27 |
| Cucumbers | Mar 9 – Mar 16 | Apr 20 – Apr 27 | Apr 13 – Apr 27 | Sep 1 – Sep 15 |
| Zucchini & Summer Squash | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | Sep 8 – Sep 22 |
| Winter Squash & Pumpkins | Mar 9 – Mar 16 | — | Apr 13 – Apr 27 | — |
| Melons & Watermelon | Mar 9 – Mar 16 | Apr 20 – May 4 | — | — |
| Carrots | — | — | Mar 16 – Apr 13 | Aug 25 – Sep 8 |
| Beets | — | — | Mar 16 – Apr 13 | Sep 8 – Sep 22 |
| Potatoes | — | — | Mar 16 – Apr 6 | — |
| Swiss Chard | — | — | Mar 23 – Apr 20 | Sep 8 – Sep 22 |
| Cilantro | — | — | Mar 23 – Apr 13 | Sep 22 – Oct 13 |
| Green Beans | — | — | Apr 13 – May 4 | Sep 1 – Sep 15 |
| Sweet Corn | — | — | Apr 13 – Apr 27 | — |
| Sweet Potatoes | — | Apr 20 – May 11 | — | — |
| Garlic | — | — | — | Nov 3 – Dec 8 |
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 Orient Pt Sp, NY weather station, 24 km away (elevation 3 ft (1 m)).
Frost dates near Westbrook
- Ivoryton Apr 6 · Nov 17
- Old Saybrook Apr 6 · Nov 17
- Clinton Apr 6 · Nov 17
- Centerbrook Apr 6 · Nov 17
- Essex Apr 6 · Nov 17
- Deep River Apr 6 · Nov 17
- Chester Apr 26 · Oct 16
- Killingworth Apr 26 · Oct 16
- Old Lyme Apr 16 · Oct 28
- Madison Apr 17 · Oct 27
Frequently asked questions
When is the last frost in Westbrook, CT?
The median last spring frost in Westbrook, CT is April 6. There is still about a 10% chance of frost after May 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Westbrook, CT?
The median first fall frost is November 17, with about a 10% chance of frost before October 31.
How long is the growing season in Westbrook, CT?
About 225 days between the median last spring frost and first fall frost.
What planting zone is Westbrook, CT?
Westbrook, CT is in USDA hardiness zone 7a.