Frost dates for Harrison, New Jersey
Half of years have their last spring frost by April 4, but 1 year in 10 still frosts after April 16.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- April 16
- 1 year in 5
- April 11
- 3 years in 10
- April 8
- 2 years in 5
- April 6
- Half of years (the median)
- April 4
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 25
- 1 year in 5
- October 30
- 3 years in 10
- November 1
- 2 years in 5
- November 4
- Half of years (the median)
- November 6
- Growing season
- about 216 days
- Hardiness zones nearby
- 7a, 7b
- Summer days
- a usual high of about 29 °C84 °F
- Lettuce and spinach run to seed
- June to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~4 °C39 °F · low ~-4 °C25 °F · rain ~93 mm3.7 in
- February
- high ~6 °C42 °F · low ~-3 °C26 °F · rain ~83 mm3.3 in
- March
- high ~10 °C50 °F · low ~0 °C33 °F · rain ~109 mm4.3 in
- April
- high ~17 °C62 °F · low ~6 °C43 °F · rain ~103 mm4.1 in
- May
- high ~22 °C72 °F · low ~12 °C53 °F · rain ~111 mm4.4 in
- June
- high ~28 °C82 °F · low ~17 °C63 °F · rain ~124 mm4.9 in
- July
- high ~30 °C87 °F · low ~20 °C69 °F · rain ~122 mm4.8 in
- August
- high ~29 °C85 °F · low ~19 °C67 °F · rain ~111 mm4.4 in
- September
- high ~25 °C78 °F · low ~16 °C60 °F · rain ~110 mm4.3 in
- October
- high ~19 °C66 °F · low ~9 °C48 °F · rain ~105 mm4.1 in
- November
- high ~12 °C54 °F · low ~3 °C38 °F · rain ~93 mm3.6 in
- December
- high ~7 °C44 °F · low ~-1 °C31 °F · rain ~116 mm4.6 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Harrison station (listed by NOAA as Harrison, USC00283704), at 40.75, -74.15. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
07002, 07003, 07017, 07018, 07028, 07029, 07031, 07032, 07050, 07071, 07094, 07102…
+33 moreShow fewer
07103, 07104, 07105, 07106, 07107, 07108, 07109, 07110, 07111, 07112, 07114, 07201, 07202, 07205, 07206, 07208, 07302, 07304, 07305, 07306, 07307, 10301, 10302, 10303, 10304, 10305, 10306, 10308, 10310, 10311, 10314, 11209, 11425.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Teterboro Airport, NJ, last frost by April 3
- New York Cntrl Pk Twr, NY, last frost by March 30
- New York Laguardia Airport, NY, last frost by March 26
- Boonton 1 SE, NJ, last frost by April 17
- Plainfield, NJ, last frost by April 11
- Bronx, NY, last frost by April 1
Other stations in New Jersey.
- Wanaque Raymond Dam, NJ, last frost by April 19
- Somerville Somerset Airport, NJ, last frost by April 26
- Freehold-Marlboro, NJ, last frost by April 17
- Long Branch-Oakhurst, NJ, last frost by April 9
- Sussex 3 WNW, NJ, last frost by April 30
- Trenton State College, NJ, last frost by April 17
- Phillipsburg-Easton Brg, NJ, last frost by April 18
- Indian Mills 2 W, NJ, last frost by April 28
When do I plant? · Where the dates come from
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