Connecticut planting calendars
Planting calendars, USDA hardiness zones, and average frost dates for 28 Connecticut locations (Bethlehem, CT, Bristol, CT, Bristol, CT, Canaan, CT, Danbury, CT, Deep River Center, CT, Lakeville, CT, Manchester, CT, Mashantucket, CT, Middletown, CT, Milford, CT, Naugatuck, CT, and 16 more). Pick a location to see its zone, average last and first frost dates, growing-season length, and a printable per-crop planting calendar, all from public NOAA and USDA data.
Locations in Connecticut
| Location | USDA zone | Last frost | First frost | Season (days) |
|---|---|---|---|---|
| Bethlehem | 6a −10 to −5 °F | Apr 20 | Oct 20 | 181 |
| Bristol | 6a −10 to −5 °F | Apr 25 | Oct 18 | 172 |
| Bristol | 6b −5 to 0 °F | Apr 25 | Oct 18 | 172 |
| Canaan | 5b −15 to −10 °F | May 3 | Oct 11 | 161 |
| Danbury | 6b −5 to 0 °F | Apr 20 | Oct 20 | 181 |
| Deep River Center | 7a 0 to 5 °F | Apr 26 | Oct 16 | 175 |
| Lakeville | 6a −10 to −5 °F | May 11 | Oct 4 | 146 |
| Manchester | 6b −5 to 0 °F | Apr 19 | Oct 22 | 186 |
| Mashantucket | 6b −5 to 0 °F | Apr 8 | Nov 2 | 207 |
| Middletown | 6b −5 to 0 °F | Apr 26 | Oct 16 | 175 |
| Milford | 7a 0 to 5 °F | Apr 5 | Nov 6 | 216 |
| Naugatuck | 6b −5 to 0 °F | Apr 25 | Oct 17 | 175 |
| New Haven | 7a 0 to 5 °F | Apr 17 | Oct 27 | 193 |
| New London | 7a 0 to 5 °F | Apr 8 | Nov 2 | 207 |
| North Granby | 6a −10 to −5 °F | Apr 21 | Oct 16 | 177 |
| North Haven | 6b −5 to 0 °F | Apr 17 | Oct 27 | 193 |
| Norwalk | 7b 5 to 10 °F | Apr 17 | Oct 23 | 188 |
| Norwich | 6b −5 to 0 °F | Apr 14 | Oct 24 | 192 |
| Quinebaug | 6a −10 to −5 °F | May 1 | Oct 9 | 161 |
| Shelton | 6b −5 to 0 °F | Apr 5 | Nov 6 | 216 |
| Stafford Springs | 6b −5 to 0 °F | May 7 | Oct 12 | 159 |
| Stamford | 7a 0 to 5 °F | Apr 17 | Oct 23 | 188 |
| Stamford | 7a 0 to 5 °F | Apr 12 | Oct 31 | 200 |
| Torrington | 6a −10 to −5 °F | May 8 | Oct 5 | 151 |
| West Hartford | 6b −5 to 0 °F | Apr 17 | Oct 26 | 191 |
| Weston | 7a 0 to 5 °F | May 1 | Oct 14 | 166 |
| Willimantic | 6b −5 to 0 °F | Apr 28 | Oct 13 | 167 |
| Winsted | 6a −10 to −5 °F | May 3 | Oct 11 | 161 |
Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.
More ways to explore
Browse by USDA hardiness zone, see when to plant common crops, or read the methodology behind every figure. This site lists 28 Connecticut locations, mapping every ZIP in the state to its nearest weather station with a full 30-year record.