Connecticut Frost Dates
Connecticut has a moderate growing season, with coastal influence softening conditions compared with the colder inland hills and uplands. Gardeners near Long Island Sound often plant earlier, while interior valleys and elevated towns stay alert for stubborn late frosts in spring.
Look up your exact frost dates
Frost timing shifts across Connecticut with elevation and distance from water. Enter your ZIP code for dates from your nearest weather station.
Connecticut locations
| ZIP | Area | Hardiness zone |
|---|---|---|
| 06057 | New Hartford Center | 6a |
| 06063 | Pleasant Valley | 6a |
| 06076 | Stafford Springs | 6b |
| 06096 | Windsor Locks | 6b |
| 06114 | Hartford | 6b |
| 06247 | Mansfield Center | 6b |
| 06250 | Mansfield Center | 6b |
| 06256 | Willimantic | 6b |
| 06268 | Storrs | 6b |
| 06269 | Storrs | 6b |
| 06340 | Long Hill | 7a |
| 06360 | Norwich | 6b |
| 06401 | Ansonia | 6b |
| 06418 | Derby | 6b |
| 06512 | East Haven | 7a |
| 06518 | Quinnipiac University | 6b |
| 06615 | Lordship | 7a |
| 06810 | Danbury | 6b |
| 06903 | Stamford | 7a |
| 06907 | Stamford | 7a |
| 06001 | Collinsville | 6b |
| 06002 | Blue Hills | 6b |
| 06010 | Bristol | 6b |
| 06013 | Bristol | 6a |
| 06016 | Broad Brook | 6b |
| 06018 | Canaan | 6a |
| 06019 | Canton Valley | 6a |
| 06020 | Canton Valley | 6a |
| 06021 | Riverton | 6a |
| 06022 | New Hartford Center | 6a |
| 06023 | Middletown | 6b |
| 06024 | Canaan | 6a |
| 06026 | Tariffville | 6b |
| 06027 | North Granby | 6a |
| 06029 | Crystal Lake | 6b |
| 06031 | Falls Village | 6a |
| 06032 | Bristol | 6b |
| 06033 | Glastonbury Center | 6b |
| 06035 | Salmon Brook | 6b |
| 06037 | Kensington | 6b |
| 06039 | Lakeville | 6a |
| 06040 | Manchester | 6b |
| 06042 | Manchester | 6b |
| 06043 | Manchester | 6b |
| 06051 | New Britain | 6b |
| 06052 | New Britain | 6b |
| 06053 | New Britain | 6b |
| 06058 | Norfolk | 6a |
| 06059 | West Simsbury | 6a |
| 06060 | North Granby | 6a |
| 06061 | New Hartford Center | 6a |
| 06062 | Bristol | 6b |
| 06065 | Riverton | 6a |
| 06066 | Rockville | 6b |
| 06067 | Wethersfield | 6b |
| 06068 | Lakeville | 6a |
| 06069 | Sharon | 6a |
| 06070 | Simsbury Center | 6b |
| 06071 | Somers | 6b |
| 06072 | Hazardville | 6b |
Source: NOAA 1991–2020 U.S. Climate Normals (public domain) and USDA 2023 Plant Hardiness Zone Map. Page updated Aug 4, 2026.