Frost dates for Trenton State College, New Jersey
Half of years have their last spring frost by April 17, but 1 year in 10 still frosts after May 6.
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
- May 6
- 1 year in 5
- April 30
- 3 years in 10
- April 25
- 2 years in 5
- April 20
- Half of years (the median)
- April 17
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 11
- 1 year in 5
- October 16
- 3 years in 10
- October 21
- 2 years in 5
- October 24
- Half of years (the median)
- October 28
- Growing season
- about 192 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 °C40 °F · low ~-5 °C23 °F · rain ~92 mm3.6 in
- February
- high ~6 °C43 °F · low ~-5 °C24 °F · rain ~70 mm2.7 in
- March
- high ~11 °C51 °F · low ~-1 °C31 °F · rain ~112 mm4.4 in
- April
- high ~17 °C63 °F · low ~5 °C40 °F · rain ~92 mm3.6 in
- May
- high ~23 °C73 °F · low ~10 °C50 °F · rain ~90 mm3.5 in
- June
- high ~28 °C82 °F · low ~15 °C59 °F · rain ~118 mm4.6 in
- July
- high ~30 °C87 °F · low ~18 °C65 °F · rain ~122 mm4.8 in
- August
- high ~29 °C84 °F · low ~17 °C63 °F · rain ~108 mm4.3 in
- September
- high ~25 °C78 °F · low ~13 °C56 °F · rain ~105 mm4.1 in
- October
- high ~19 °C66 °F · low ~7 °C44 °F · rain ~101 mm4 in
- November
- high ~13 °C55 °F · low ~1 °C35 °F · rain ~80 mm3.2 in
- December
- high ~7 °C44 °F · low ~-3 °C26 °F · rain ~110 mm4.3 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Trenton State College station (listed by NOAA as Trenton State College, USC00288880), at 40.27, -74.79. 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
08501, 08512, 08520, 08525, 08528, 08530, 08534, 08536, 08540, 08542, 08550, 08551…
+26 moreShow fewer
08553, 08558, 08560, 08561, 08608, 08609, 08610, 08611, 08618, 08619, 08620, 08628, 08629, 08638, 08648, 08690, 08691, 08852, 18940, 18977, 19030, 19047, 19054, 19055, 19056, 19067.
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Willow Grove Naval Air Station, PA, last frost by April 11
- Somerville Somerset Airport, NJ, last frost by April 26
- Freehold-Marlboro, NJ, last frost by April 17
- Phila Franklin Inst, PA, last frost by March 30
- Plainfield, NJ, last frost by April 11
- Indian Mills 2 W, NJ, last frost by April 28
Other stations in New Jersey.
- Phillipsburg-Easton Brg, NJ, last frost by April 18
- Long Branch-Oakhurst, NJ, last frost by April 9
- Harrison, NJ, last frost by April 4
- Boonton 1 SE, NJ, last frost by April 17
- Teterboro Airport, NJ, last frost by April 3
- Wanaque Raymond Dam, NJ, last frost by April 19
- Millville Municipal Airport, NJ, last frost by April 24
- Sussex 3 WNW, NJ, last frost by April 30
When do I plant? · Where the dates come from
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