Thomaston, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thomaston, a community in Litchfield County, Connecticut.
Today
81°F
Sunny
Sunny, with a high near 81. West wind 0 to 3 mph.
7-day forecast for Thomaston
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Sunny | 0 to 3 mph W | 0% |
| Tonight | 60°F | Partly Cloudy then Patchy Fog | 2 mph SW | 2% |
| Wednesday | 80°F | Patchy Fog then Partly Sunny | 0 to 5 mph SW | 8% |
| Wednesday Night | 66°F | Slight Chance Rain Showers | 0 to 3 mph S | 20% |
| Thursday | 84°F | Chance Showers And Thunderstorms | 0 to 7 mph SW | 64% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms then Isolated Showers And Thunderstorms | 1 to 5 mph SW | 64% |
| Friday | 85°F | Mostly Sunny then Scattered Showers And Thunderstorms | 1 to 6 mph SW | 49% |
| Friday Night | 67°F | Scattered Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 mph W | 49% |
| Saturday | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph W | 40% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 3 mph W | 40% |
| Sunday | 85°F | Mostly Sunny | 2 to 7 mph W | 12% |
| Sunday Night | 67°F | Mostly Clear | 5 mph SW | 12% |
| Monday | 86°F | Sunny then Slight Chance Showers And Thunderstorms | 2 to 9 mph W | 19% |
| Monday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph W | 19% |
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 Aug 4, 2026.