Mill Plain, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mill Plain, a community in Fairfield County, Connecticut.
This Afternoon
71°F
Sunny
Sunny. High near 71, with temperatures falling to around 65 in the afternoon. South wind around 9 mph.
7-day forecast for Mill Plain
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Sunny | 9 mph S | 0% |
| Tonight | 57°F | Partly Cloudy | 6 mph SW | 3% |
| Thursday | 70°F | Chance Light Rain | 5 to 12 mph S | 40% |
| Thursday Night | 60°F | Light Rain Likely | 2 to 8 mph SW | 68% |
| Friday | 69°F | Light Rain Likely | 5 mph SW | 68% |
| Friday Night | 51°F | Light Rain Likely | 3 mph W | 65% |
| Saturday | 65°F | Mostly Sunny then Slight Chance Light Rain | 3 to 9 mph NW | 17% |
| Saturday Night | 43°F | Chance Light Rain | 8 to 12 mph NW | 30% |
| Sunday | 60°F | Chance Light Rain then Mostly Sunny | 10 to 14 mph NW | 30% |
| Sunday Night | 40°F | Partly Cloudy | 10 mph W | 0% |
| Monday | 58°F | Sunny | 12 to 15 mph W | 4% |
| Monday Night | 38°F | Mostly Clear | 7 to 10 mph W | 4% |
| Tuesday | 61°F | Sunny | 13 mph W | 1% |
| Tuesday Night | 39°F | Mostly Clear | 6 to 9 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Mill Plain (41.155, -73.268). Updated through the day.
Growing snapshot for Mill Plain
Last spring frost
Apr 5
First fall frost
Nov 6
Growing season
216 days
Hardiness zone
7a
More local growing data for Mill Plain: nearby ZIP 06890 weather · frost dates · planting calendar · Connecticut frost dates
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Coleytown
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Climate data from the nearest NOAA station, Bridgeport Sikorsky Mem Ap, Ct (8.3 mi from Mill Plain). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.