Cornwall, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cornwall, a community in Litchfield County, Connecticut.
Overnight
47°F
Mostly Cloudy
Mostly cloudy, with a low around 47. North wind around 2 mph.
7-day forecast for Cornwall
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Mostly Cloudy | 2 mph N | 0% |
| Saturday | 68°F | Mostly Sunny | 2 mph E | 0% |
| Saturday Night | 50°F | Mostly Cloudy | 1 mph SE | 2% |
| Sunday | 63°F | Rain Showers | 1 to 6 mph SE | 95% |
| Sunday Night | 52°F | Rain Showers | 1 to 6 mph E | 95% |
| Monday | 65°F | Slight Chance Rain Showers | 7 mph N | 24% |
| Monday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 2 to 7 mph NE | 20% |
| Tuesday | 60°F | Slight Chance Rain Showers | 8 mph NE | 21% |
| Tuesday Night | 45°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| Wednesday | 61°F | Partly Sunny then Slight Chance Rain Showers | 8 to 12 mph NE | 15% |
| Wednesday Night | 45°F | Chance Rain Showers | 7 to 10 mph NE | 25% |
| Thursday | 61°F | Chance Rain Showers | 7 to 10 mph NE | 29% |
| Thursday Night | 47°F | Chance Rain Showers | 5 to 8 mph NE | 35% |
| Friday | 66°F | Chance Rain Showers | 8 mph N | 32% |
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 Sep 19, 2026.