Frost dates in Connecticut
Across Connecticut, the typical last spring frost is around Apr 21 and the first fall frost around Oct 20. Your own dates depend on where you are in the state; find your county below.
Most of the state's last spring frosts fall between Apr 12 and May 3, and its first fall frosts between Oct 9 and Oct 31.
These are the dates with a 50% chance of a 32°F frost on or after (spring) or on or before (fall), so plan tender crops a week or two after the spring date and keep row cover handy. For dates at your exact ZIP code, use the zone and frost date lookup; for what to plant when, see the planting guide by frost date.
Hardiness zones in Connecticut: zone 6a, zone 6b, zone 7a, zone 7b
Frost dates by county in Connecticut
| County | Last spring frost | First fall frost | Growing season |
|---|---|---|---|
| Fairfield | Apr 17 | Oct 23 | About 189 days |
| Hartford | Apr 21 | Oct 18 | About 180 days |
| Litchfield | May 4 | Oct 7 | About 156 days |
| Middlesex | Apr 17 | Oct 26 | About 192 days |
| New Haven | Apr 18 | Oct 26 | About 191 days |
| New London | Apr 14 | Oct 24 | About 193 days |
| Tolland | Apr 19 | Oct 22 | About 186 days |
| Windham | Apr 30 | Oct 15 | About 168 days |
Source: NOAA NCEI U.S. Climate Normals 1991–2020, 50% probability of 32°F, from the weather station nearest each ZIP code; each county shows the middle value across its ZIP codes. Hills, valleys and cities can run a week or more earlier or later.