Flagtown, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Flagtown, a community in Somerset County, New Jersey.
This Afternoon
74°F
Mostly Sunny
Mostly sunny, with a high near 74. East wind around 5 mph.
7-day forecast for Flagtown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Sunny | 5 mph E | 1% |
| Tonight | 56°F | Mostly Cloudy | 0 to 5 mph E | 9% |
| Sunday | 72°F | Rain Showers | 5 mph SE | 91% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 67% |
| Monday | 68°F | Chance Rain Showers then Partly Sunny | 5 to 10 mph NE | 32% |
| Monday Night | 49°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph NE | 27% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 32% |
| Tuesday Night | 48°F | Chance Rain Showers | 10 mph NE | 29% |
| Wednesday | 64°F | Slight Chance Rain Showers | 10 to 15 mph NE | 23% |
| Wednesday Night | 48°F | Chance Rain Showers | 10 mph NE | 32% |
| Thursday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Thursday Night | 48°F | Chance Rain Showers | 10 mph N | 33% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 31% |
| Friday Night | 48°F | Chance Rain Showers | 10 mph N | 29% |
Forecast source: National Weather Service (api.weather.gov) for Flagtown (40.523, -74.691). Updated through the day.
Growing snapshot for Flagtown
Last spring frost
Apr 16
First fall frost
Oct 27
Growing season
192 days
More local growing data for Flagtown: nearby ZIP 08821 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Basking Ridge
Bedminster
Belle Mead
Bernardsville
Blackwells Mills
Blawenburg
Bound Brook
Bradley Gardens
Bridgewater Center
Clyde
Dunellen
East Millstone
East Rocky Hill
Far Hills
Finderne
Franklin Center
Franklin Park
Green Knoll
Griggstown
Harlingen
Hillsborough
Kingston
Lamington
Liberty Corner
Lyons
Manville
Martinsville
Middlebush
Millstone
Neshanic
Climate data from the nearest NOAA station, Wertsville 4 Ne, Nj (6.7 mi from Flagtown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.