Thomaston, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thomaston, a community in Litchfield County, Connecticut.
Tonight
49°F
Partly Cloudy then Patchy Fog
Patchy fog after 3am. Partly cloudy, with a low around 49. Southwest wind around 2 mph.
7-day forecast for Thomaston
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Partly Cloudy then Patchy Fog | 2 mph SW | 5% |
| Wednesday | 71°F | Patchy Fog then Sunny | 2 to 10 mph SW | 3% |
| Wednesday Night | 54°F | Mostly Cloudy | 2 to 7 mph SW | 4% |
| Thursday | 67°F | Chance Rain Showers | 6 to 10 mph SW | 49% |
| Thursday Night | 59°F | Rain Showers | 1 to 6 mph SW | 79% |
| Friday | 67°F | Rain Showers then Rain | 0 to 5 mph S | 80% |
| Friday Night | 53°F | Rain | 3 mph N | 80% |
| Saturday | 63°F | Chance Light Rain | 7 mph NW | 52% |
| Saturday Night | 41°F | Chance Light Rain | 7 mph NW | 25% |
| Sunday | 58°F | Slight Chance Light Rain then Mostly Sunny | 5 to 8 mph W | 22% |
| Sunday Night | 36°F | Partly Cloudy then Slight Chance Light Rain | 3 to 7 mph W | 15% |
| Monday | 56°F | Chance Light Rain | 7 to 13 mph NW | 27% |
| Monday Night | 35°F | Chance Light Rain | 9 mph W | 27% |
| Tuesday | 57°F | Slight Chance Light Rain then Mostly Sunny | 9 to 13 mph W | 24% |
Forecast source: National Weather Service (api.weather.gov) for Thomaston (41.677, -73.083). Updated through the day.
Growing snapshot for Thomaston
Last spring frost
Apr 25
First fall frost
Oct 18
Growing season
172 days
Hardiness zone
6a
More local growing data for Thomaston: nearby ZIP 06787 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Bantam
Bethlehem Village
Bridgewater
Canaan
Cornwall
Cornwall Bridge
Falls Village
Gaylordsville
Lakeville
Litchfield
New Hartford Center
New Milford
New Preston
Norfolk
Northwest Harwinton
Oakville
Pleasant Valley
Sharon
Terryville
Torrington
Watertown
West Cornwall
Winsted
Woodbury Center
Climate data from the nearest NOAA station, Burlington, Ct (11.6 mi from Thomaston). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.