Frost Dates & Planting Calendars in Connecticut
Typical last spring frost, first fall frost, and growing-season length for 86 cities in Connecticut, based on NOAA 1991–2020 climate normals. Click a city for its full frost-date summary, monthly temperature chart, and 42-crop planting calendar.
| City | Last Spring Frost (typical) | First Fall Frost (typical) | Growing Season | USDA Zone |
|---|---|---|---|---|
| Bridgeport | April 5 | November 6 | 216 days | 7a |
| New Haven | April 17 | October 27 | 193 days | 7a |
| Stamford | April 17 | October 23 | 188 days | 7a |
| North Stamford | April 17 | October 23 | 188 days | 7a |
| Hartford | April 17 | October 26 | 191 days | 6b |
| Waterbury | April 26 | October 16 | 175 days | 6b |
| Norwalk | April 17 | October 23 | 188 days | 7a |
| Danbury | April 20 | October 20 | 181 days | 6b |
| East Norwalk | April 17 | October 23 | 188 days | 7b |
| New Britain | April 17 | October 26 | 191 days | 6b |
| West Hartford | April 17 | October 26 | 191 days | 6b |
| Bristol | April 25 | October 18 | 172 days | 6b |
| Meriden | April 26 | October 16 | 175 days | 6b |
| Hamden | April 18 | October 26 | 191 days | 6b |
| Fairfield | April 5 | November 6 | 216 days | 7a |
| West Haven | April 17 | October 27 | 193 days | 7a |
| Milford | April 5 | November 6 | 216 days | 7a |
| Stratford | April 5 | November 6 | 216 days | 7a |
| City of Milford (balance) | April 5 | November 6 | 216 days | 7a |
| East Hartford | April 17 | October 26 | 191 days | 6b |
| Middletown | April 26 | October 16 | 175 days | 6b |
| Enfield | April 21 | October 16 | 177 days | 6b |
| Southington | April 26 | October 16 | 175 days | 6b |
| Shelton | April 25 | October 17 | 175 days | 6b |
| Norwich | April 14 | October 24 | 192 days | 6b |
| Trumbull | April 5 | November 6 | 216 days | 7a |
| West Torrington | May 8 | October 5 | 151 days | 6a |
| Torrington | May 8 | October 5 | 151 days | 6a |
| Glastonbury | April 17 | October 26 | 191 days | 6b |
| Naugatuck | April 18 | October 26 | 191 days | 6b |
| Manchester | April 17 | October 26 | 191 days | 6b |
| Newington | April 17 | October 26 | 191 days | 6b |
| Cheshire | April 26 | October 16 | 175 days | 6b |
| Branford | April 17 | October 27 | 193 days | 7a |
| East Haven | April 17 | October 27 | 193 days | 7a |
| Windsor | April 21 | October 16 | 177 days | 6b |
| New London | April 8 | November 2 | 207 days | 7a |
| Wethersfield | April 17 | October 26 | 191 days | 6b |
| Mansfield City | April 19 | October 22 | 186 days | 6b |
| Westport | April 17 | October 23 | 188 days | 7a |
| Farmington | April 25 | October 18 | 172 days | 6b |
| South Windsor | April 17 | October 26 | 191 days | 6b |
| North Haven | April 18 | October 26 | 191 days | 6b |
| Windham | April 28 | October 13 | 167 days | 6b |
| Guilford | April 17 | October 27 | 193 days | 7a |
| Bloomfield | April 17 | October 26 | 191 days | 6b |
| Darien | April 17 | October 23 | 188 days | 7a |
| Montville Center | April 14 | October 24 | 192 days | 6b |
| Southbury | April 25 | October 17 | 175 days | 6b |
| New Canaan | April 17 | October 23 | 188 days | 7a |
| Waterford | April 16 | October 28 | 194 days | 7a |
| Madison | April 17 | October 27 | 193 days | 7a |
| Avon | April 25 | October 18 | 172 days | 6b |
| Ansonia | April 25 | October 17 | 175 days | 6b |
| Wallingford Center | April 26 | October 16 | 175 days | 6b |
| Wilton | April 17 | October 23 | 188 days | 7a |
| Willimantic | April 28 | October 13 | 167 days | 6b |
| Wallingford | April 26 | October 16 | 175 days | 6b |
| Plainville | April 25 | October 18 | 172 days | 6b |
| Killingly Center | April 25 | October 19 | 176 days | 6b |
| Wolcott | April 26 | October 16 | 175 days | 6b |
| Seymour | April 25 | October 17 | 175 days | 6b |
| Plainfield | April 30 | October 15 | 167 days | 6b |
| Storrs | April 19 | October 22 | 186 days | 6b |
| Ledyard | April 8 | November 2 | 207 days | 6b |
| Tolland | April 19 | October 22 | 186 days | 6b |
| Ellington | April 21 | October 16 | 177 days | 6b |
| North Branford | April 17 | October 27 | 193 days | 7a |
| New Fairfield | April 20 | October 20 | 181 days | 6b |
| Orange | April 25 | October 17 | 175 days | 7a |
| Cromwell | April 17 | October 26 | 191 days | 6b |
| Greenwich | April 12 | October 31 | 200 days | 7a |
| Derby | April 25 | October 17 | 175 days | 6b |
| Windsor Locks | April 21 | October 16 | 177 days | 6b |
| Plymouth | April 25 | October 18 | 172 days | 6a |
| Stafford | May 7 | October 12 | 159 days | 6b |
| Oxford | April 25 | October 17 | 175 days | 6b |
| Winchester Center | May 3 | October 11 | 161 days | 6a |
| Old Saybrook | April 6 | November 17 | 221 days | 7a |
| Woodbury | April 25 | October 17 | 175 days | 6b |
| Bethel | April 20 | October 20 | 181 days | 6b |
| Prospect | April 18 | October 26 | 191 days | 6b |
| Thompson | May 1 | October 9 | 161 days | 6b |
| Woodbridge | April 25 | October 17 | 175 days | 6b |
| Hebron | April 28 | October 13 | 167 days | 6b |
| Groton | April 8 | November 2 | 207 days | 7a |