Connecticut planting zones & frost dates
USDA hardiness zones in Connecticut go from 6a to 7a. Pick your city for its average frost dates and a planting calendar, or search by ZIP code.
| City | Zone | Avg. last frost | Avg. first frost |
|---|---|---|---|
| Ansonia | 6b | Apr 25 | Oct 17 |
| Avon | 6b | Apr 25 | Oct 18 |
| Bloomfield | 6b | Apr 17 | Oct 26 |
| Branford | 7a | Apr 17 | Oct 27 |
| Bridgeport | 7a | Apr 5 | Nov 6 |
| Bristol | 6b | Apr 25 | Oct 18 |
| Cheshire | 6b | Apr 26 | Oct 16 |
| City of Milford (balance) | 7a | Apr 5 | Nov 6 |
| Cromwell | 6b | Apr 17 | Oct 26 |
| Danbury | 6b | Apr 20 | Oct 20 |
| Darien | 7a | Apr 17 | Oct 23 |
| Derby | 6b | Apr 25 | Oct 17 |
| East Hartford | 6b | Apr 17 | Oct 26 |
| East Haven | 7a | Apr 17 | Oct 27 |
| East Norwalk | 7a | Apr 17 | Oct 23 |
| Ellington | 6b | Apr 21 | Oct 16 |
| Enfield | 6b | Apr 21 | Oct 16 |
| Fairfield | 7a | Apr 5 | Nov 6 |
| Farmington | 6b | Apr 25 | Oct 18 |
| Glastonbury | 6b | Apr 17 | Oct 26 |
| Greenwich | 7a | Apr 12 | Oct 31 |
| Guilford | 7a | Apr 17 | Oct 27 |
| Hamden | 6b | Apr 18 | Oct 26 |
| Hartford | 6b | Apr 17 | Oct 26 |
| Killingly Center | 6b | Apr 25 | Oct 19 |
| Ledyard | 6b | Apr 8 | Nov 2 |
| Madison | 7a | Apr 17 | Oct 27 |
| Manchester | 6b | Apr 17 | Oct 26 |
| Mansfield City | 6b | Apr 19 | Oct 22 |
| Meriden | 6b | Apr 26 | Oct 16 |
| Middletown | 6b | Apr 26 | Oct 16 |
| Milford | 7a | Apr 5 | Nov 6 |
| Montville Center | 6b | Apr 14 | Oct 24 |
| Naugatuck | 6b | Apr 18 | Oct 26 |
| New Britain | 6b | Apr 17 | Oct 26 |
| New Canaan | 7a | Apr 17 | Oct 23 |
| New Fairfield | 6b | Apr 20 | Oct 20 |
| New Haven | 7a | Apr 17 | Oct 27 |
| New London | 7a | Apr 8 | Nov 2 |
| Newington | 6b | Apr 17 | Oct 26 |
| North Branford | 7a | Apr 17 | Oct 27 |
| North Haven | 6b | Apr 18 | Oct 26 |
| North Stamford | 7a | Apr 17 | Oct 23 |
| Norwalk | 7a | Apr 17 | Oct 23 |
| Norwich | 6b | Apr 14 | Oct 24 |
| Old Saybrook | 7a | Apr 6 | Nov 17 |
| Orange | 7a | Apr 25 | Oct 17 |
| Oxford | 6b | Apr 25 | Oct 17 |
| Plainfield | 6b | Apr 30 | Oct 15 |
| Plainville | 6b | Apr 25 | Oct 18 |
| Plymouth | 6a | Apr 25 | Oct 18 |
| Seymour | 6b | Apr 25 | Oct 17 |
| Shelton | 6b | Apr 25 | Oct 17 |
| South Windsor | 6b | Apr 17 | Oct 26 |
| Southbury | 6b | Apr 25 | Oct 17 |
| Southington | 6b | Apr 26 | Oct 16 |
| Stafford | 6a | May 7 | Oct 12 |
| Stamford | 7a | Apr 17 | Oct 23 |
| Storrs | 6b | Apr 19 | Oct 22 |
| Stratford | 7a | Apr 5 | Nov 6 |
| Tolland | 6b | Apr 19 | Oct 22 |
| Torrington | 6a | May 8 | Oct 5 |
| Trumbull | 7a | Apr 5 | Nov 6 |
| Wallingford | 6b | Apr 26 | Oct 16 |
| Wallingford Center | 6b | Apr 26 | Oct 16 |
| Waterbury | 6b | Apr 26 | Oct 16 |
| Waterford | 7a | Apr 16 | Oct 28 |
| West Hartford | 6b | Apr 17 | Oct 26 |
| West Haven | 7a | Apr 17 | Oct 27 |
| West Torrington | 6a | May 8 | Oct 5 |
| Westport | 7a | Apr 17 | Oct 23 |
| Wethersfield | 6b | Apr 17 | Oct 26 |
| Willimantic | 6b | Apr 28 | Oct 13 |
| Wilton | 7a | Apr 17 | Oct 23 |
| Winchester Center | 6a | May 3 | Oct 11 |
| Windham | 6b | Apr 28 | Oct 13 |
| Windsor | 6b | Apr 21 | Oct 16 |
| Windsor Locks | 6b | Apr 21 | Oct 16 |
| Wolcott | 6b | Apr 26 | Oct 16 |
Cities with 10,000+ residents. Data: USDA Plant Hardiness Zone Map 2023 and NOAA Climate Normals 1991–2020. Sources and method.