Cedar Knolls, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cedar Knolls, a community in Morris County, New Jersey.
Tonight
58°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 5am. Mostly cloudy, with a low around 58. Southeast wind 0 to 5 mph. Chance of precipitation is 20%.
7-day forecast for Cedar Knolls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 21% |
| Sunday | 71°F | Rain Showers | 5 mph SE | 91% |
| Sunday Night | 56°F | Showers And Thunderstorms | 0 to 10 mph NW | 86% |
| Monday | 68°F | Slight Chance Rain Showers | 5 to 10 mph NE | 22% |
| Monday Night | 51°F | Chance Rain Showers | 5 to 10 mph NE | 30% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 30% |
| Tuesday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 30% |
| Wednesday | 63°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 18% |
| Wednesday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Thursday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Thursday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Friday | 65°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Friday Night | 51°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Saturday | 68°F | Chance Rain Showers | 10 to 15 mph N | 31% |
Forecast source: National Weather Service (api.weather.gov) for Cedar Knolls (40.819, -74.455). Updated through the day.
Growing snapshot for Cedar Knolls
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
7a
More local growing data for Cedar Knolls: nearby ZIP 07927 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
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Boonton
Brookside
Budd Lake
Chester
Dover
Flanders
Florham Park
Gillette
Green Village
Hibernia
Kenvil
Kinnelon
Lake Hiawatha
Lake Hopatcong
Lake Telemark
Landing
Ledgewood
Lincoln Park
Long Valley
Lower Berkshire Valley
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Madison
Mendham
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Morris Plains
Morristown
Mount Arlington
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Mount Tabor
Climate data from the nearest NOAA station, Boonton 1 Se, Nj (5.6 mi from Cedar Knolls). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.