Green Knoll, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Green Knoll, a community in Somerset County, New Jersey.
This Afternoon
73°F
Mostly Sunny
Mostly sunny, with a high near 73. East wind around 5 mph.
7-day forecast for Green Knoll
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Sunny | 5 mph E | 1% |
| Tonight | 56°F | Mostly Cloudy | 0 to 5 mph SE | 9% |
| Sunday | 72°F | Rain Showers | 5 mph SE | 92% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely | 0 to 5 mph NW | 68% |
| Monday | 68°F | Chance Rain Showers then Partly Sunny | 5 to 10 mph NE | 30% |
| Monday Night | 50°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph NE | 26% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 31% |
| Tuesday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 27% |
| Wednesday | 64°F | Slight Chance Rain Showers | 10 to 15 mph NE | 23% |
| Wednesday Night | 49°F | Chance Rain Showers | 10 mph NE | 32% |
| Thursday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Thursday Night | 48°F | Chance Rain Showers | 5 to 10 mph N | 34% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 31% |
| Friday Night | 49°F | Chance Rain Showers | 5 to 10 mph N | 29% |
Forecast source: National Weather Service (api.weather.gov) for Green Knoll (40.605, -74.615). Updated through the day.
Growing snapshot for Green Knoll
Last spring frost
Apr 30
First fall frost
Oct 20
Growing season
172 days
Hardiness zone
7a
More local growing data for Green Knoll: nearby ZIP 08807 weather · frost dates · planting calendar · New Jersey frost dates
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Climate data from the nearest NOAA station, Somerville 4 Nw, Nj (2.4 mi from Green Knoll). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.