Thomaston, CT Weather & Growing Conditions
Overnight
49°F
Partly Cloudy
Partly cloudy, with a low around 49. North wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 66°F | Mostly Sunny | 1 to 5 mph NE | 0% |
| Saturday Night | 50°F | Mostly Cloudy | 1 mph SE | 1% |
| Sunday | 63°F | Rain Showers | 0 to 6 mph SE | 93% |
| Sunday Night | 53°F | Rain Showers | 2 to 9 mph NE | 93% |
| Monday | 63°F | Chance Rain Showers | 6 to 10 mph NE | 30% |
| Monday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 3 to 10 mph NE | 22% |
| Tuesday | 59°F | Slight Chance Rain Showers | 8 to 12 mph NE | 22% |
| Tuesday Night | 46°F | Mostly Cloudy | 8 to 14 mph NE | 8% |
| Wednesday | 60°F | Partly Sunny then Slight Chance Rain Showers | 10 to 15 mph NE | 15% |
| Wednesday Night | 46°F | Slight Chance Rain Showers | 10 to 15 mph NE | 24% |
| Thursday | 59°F | Chance Rain Showers | 10 to 15 mph NE | 30% |
| Thursday Night | 47°F | Chance Rain Showers | 9 to 14 mph NE | 34% |
| Friday | 63°F | Chance Rain Showers | 9 to 14 mph N | 33% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Thomaston, CT
Last spring frost
Apr 25
First fall frost
Oct 18
Growing season
172 days
Hardiness zone
6a
Explore more for Thomaston, CT: full frost dates · planting calendar · Connecticut frost dates
Climate data from the nearest NOAA station, Burlington, Ct (11.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.