Cornwall, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cornwall, a community in Litchfield County, Connecticut.
Tonight
49°F
Partly Cloudy
Partly cloudy, with a low around 49. South wind around 2 mph.
7-day forecast for Cornwall
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Partly Cloudy | 2 mph S | 5% |
| Wednesday | 72°F | Sunny | 2 to 9 mph SW | 4% |
| Wednesday Night | 55°F | Mostly Cloudy | 2 to 6 mph S | 2% |
| Thursday | 68°F | Rain Showers Likely | 5 to 8 mph S | 65% |
| Thursday Night | 59°F | Rain Showers Likely | 0 to 5 mph SW | 70% |
| Friday | 67°F | Rain Showers Likely then Rain Likely | 0 to 3 mph SW | 74% |
| Friday Night | 51°F | Rain Likely | 1 mph N | 74% |
| Saturday | 62°F | Chance Light Rain | 5 mph NW | 54% |
| Saturday Night | 39°F | Chance Light Rain | 3 mph NW | 32% |
| Sunday | 57°F | Slight Chance Light Rain then Mostly Sunny | 6 mph NW | 24% |
| Sunday Night | 34°F | Partly Cloudy then Slight Chance Light Rain | 3 mph W | 15% |
| Monday | 56°F | Chance Light Rain | 5 to 9 mph NW | 29% |
| Monday Night | 33°F | Chance Light Rain | 6 mph W | 29% |
| Tuesday | 57°F | Chance Light Rain then Mostly Sunny | 6 to 9 mph W | 25% |
Forecast source: National Weather Service (api.weather.gov) for Cornwall (41.844, -73.333). Updated through the day.
Growing snapshot for Cornwall
Last spring frost
May 11
First fall frost
Oct 4
Growing season
146 days
Hardiness zone
6a
More local growing data for Cornwall: nearby ZIP 06753 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Bantam
Bethlehem Village
Bridgewater
Canaan
Cornwall Bridge
Falls Village
Gaylordsville
Lakeville
Litchfield
New Hartford Center
New Milford
New Preston
Norfolk
Northwest Harwinton
Oakville
Pleasant Valley
Sharon
Terryville
Thomaston
Torrington
Watertown
West Cornwall
Winsted
Woodbury Center
Climate data from the nearest NOAA station, Falls Village, Ct (8.7 mi from Cornwall). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.