Old Greenwich, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Old Greenwich, a community in Fairfield County, Connecticut.
Today
72°F
Sunny
Sunny. High near 72, with temperatures falling to around 67 in the afternoon. South wind 5 to 8 mph.
7-day forecast for Old Greenwich
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Sunny | 5 to 8 mph S | 0% |
| Tonight | 59°F | Partly Cloudy | 2 to 7 mph S | 0% |
| Thursday | 71°F | Mostly Cloudy | 6 to 12 mph S | 13% |
| Thursday Night | 61°F | Rain Showers Likely | 5 to 9 mph S | 69% |
| Friday | 69°F | Rain Showers | 5 mph S | 89% |
| Friday Night | 54°F | Rain Showers Likely | 5 mph NE | 74% |
| Saturday | 65°F | Mostly Sunny then Slight Chance Rain Showers | 6 to 10 mph NW | 16% |
| Saturday Night | 47°F | Slight Chance Light Rain | 10 to 14 mph W | 24% |
| Sunday | 59°F | Slight Chance Light Rain then Mostly Sunny | 13 mph W | 15% |
| Sunday Night | 44°F | Partly Cloudy | 13 mph W | 3% |
| Monday | 58°F | Sunny then Slight Chance Light Rain | 13 to 16 mph W | 15% |
| Monday Night | 43°F | Slight Chance Light Rain then Mostly Clear | 14 mph W | 15% |
| Tuesday | 61°F | Sunny | 15 mph SW | 4% |
| Tuesday Night | 43°F | Mostly Clear | 14 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Old Greenwich (41.020, -73.568). Updated through the day.
Growing snapshot for Old Greenwich
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
188 days
Hardiness zone
7b
More local growing data for Old Greenwich: nearby ZIP 06870 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Ball Pond
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Bigelow Corners
Bogus Hill
Botsford
Branchville
Bridgeport
Brookfield Center
Candlewood Isle
Candlewood Knolls
Candlewood Lake Club
Candlewood Orchards
Candlewood Shores
Cannondale
Chimney Point
Coleytown
Compo
Cos Cob
Danbury
Daniels Farm
Darien Downtown
Dodgingtown
East Village
Fairfield University
Georgetown
Greens Farms
Greenwich
Hawleyville
Indian Field
Inglenook
Climate data from the nearest NOAA station, Stamford 5 N, Ct (7 mi from Old Greenwich). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.