Collinsville, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Collinsville, a community in Hartford County, Connecticut.
Today
67°F
Mostly Sunny
Mostly sunny, with a high near 67. Northeast wind around 5 mph.
7-day forecast for Collinsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 67°F | Mostly Sunny | 5 mph NE | 0% |
| Tonight | 49°F | Mostly Cloudy | 2 mph SE | 1% |
| Sunday | 62°F | Rain Showers | 1 to 6 mph SE | 87% |
| Sunday Night | 50°F | Rain Showers | 3 to 10 mph NE | 76% |
| Monday | 65°F | Partly Sunny | 6 to 10 mph N | 7% |
| Monday Night | 45°F | Mostly Cloudy | 3 to 8 mph NE | 3% |
| Tuesday | 61°F | Mostly Cloudy | 9 mph NE | 5% |
| Tuesday Night | 44°F | Mostly Cloudy | 6 to 10 mph NE | 4% |
| Wednesday | 63°F | Partly Sunny | 14 mph NE | 5% |
| Wednesday Night | 44°F | Mostly Cloudy then Slight Chance Rain Showers | 9 to 14 mph NE | 24% |
| Thursday | 61°F | Chance Rain Showers | 13 to 16 mph NE | 31% |
| Thursday Night | 46°F | Chance Rain Showers | 13 to 16 mph N | 36% |
| Friday | 63°F | Chance Rain Showers | 13 to 16 mph N | 33% |
| Friday Night | 47°F | Chance Rain Showers | 12 to 15 mph N | 34% |
Forecast source: National Weather Service (api.weather.gov) for Collinsville (41.822, -72.924). Updated through the day.
Growing snapshot for Collinsville
Last spring frost
Apr 25
First fall frost
Oct 18
Growing season
172 days
Hardiness zone
6a
More local growing data for Collinsville: nearby ZIP 06019 weather · frost dates · planting calendar · Connecticut frost dates
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Climate data from the nearest NOAA station, Burlington, Ct (4.6 mi from Collinsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.