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Connecticut frost dates
Across the 8Connecticut weather stations below, the average last spring frost ranges from Apr 5 in Bridgeport Sikorsky to May 1 in Danbury. The statewide middle is about Apr 19 for the last spring frost and Oct 21 for the first fall frost. Bridgeport Sikorsky has the longest growing season, about 215 days. Hardiness zones in these places: 6b, 7a.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Bridgeport Sikorsky | 7a | Apr 5 | Apr 17 | Nov 6 | 215 |
| Groton New London | 7a | Apr 16 | Apr 30 | Oct 28 | 195 |
| Hartford Brainard | 6b | Apr 17 | May 1 | Oct 26 | 192 |
| New Haven Tweed | 7a | Apr 17 | May 1 | Oct 27 | 193 |
| Hartford Bradley | 6b | Apr 21 | May 6 | Oct 16 | 178 |
| Meriden Markham | 6b | Apr 26 | May 9 | Oct 16 | 173 |
| Willimantic Windham | 6b | Apr 28 | May 11 | Oct 13 | 168 |
| Danbury | 6b | May 1 | May 16 | Oct 14 | 166 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Connecticut
Using the statewide middle dates (last frost Apr 19, first frost Oct 21). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Connecticut |
|---|---|
| Tomatoes | Apr 26 – May 10 |
| Peas | Mar 8 – Mar 29; fall: Jul 29 – Aug 19 |
| Potatoes | Mar 22 – Apr 12 |
| Green beans | Apr 26 – May 10; fall: Aug 5 – Aug 19 |
| Garlic | Oct 21 – Nov 18 |
| Tulips | Oct 7 – Nov 18 |