Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 07033 — Kenilworth, NJ

ZIP code 07033 (Kenilworth, Union County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 11 and the first fall frost October 31.

Where ZIP 07033 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 11
First frostOct 31
2012 zone7a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Kenilworth, NJ…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Kenilworth, NJ

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 11median — 50% chance of a later frost
Safe for tender plantsApril 28only 10% chance of frost after
First fall frostOctober 31median — 10% chance by Oct 14
Growing season202 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 30 and returns around November 12.

From the NOAA station Cranford, NJ — 2 miles away, elevation 79 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 07033

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 28 – Mar 14
SpinachSow outdoors · Feb 28 – Mar 21
Broccoli, cabbageStart indoors · Jan 31 – Feb 14
Broccoli, cabbageTransplant · Mar 21 – Apr 4
Onion setsPlant outdoors · Mar 14 – Mar 28
PotatoesPlant outdoors · Mar 21 – Apr 4
LettuceSow outdoors · Mar 14 – Mar 28
Carrots, beetsSow outdoors · Mar 21 – Apr 4
TomatoesStart indoors · Feb 14 – Feb 28
TomatoesTransplant · Apr 18 – May 2
Peppers, eggplantStart indoors · Jan 31 – Feb 14
Peppers, eggplantTransplant · Apr 25 – May 9
BeansSow outdoors · Apr 18 – May 2
Sweet cornSow outdoors · Apr 18 – May 2
Cucumbers, squashSow outdoors · Apr 18 – May 2
Fall lettuce, spinachSow outdoors · Sep 5 – Sep 19
GarlicPlant cloves · Oct 17 – Nov 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 11) and first fall frost (Oct 31) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 07033 came on Mar 22 — about the same time as the 1991–2020 average (Mar 22).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Kenilworth, NJ

The soil mapped at the center of ZIP 07033 is Haledon — loam, somewhat poorly drained.

TextureLoama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Haledon-Urban land-Hasbrouck complex, 0 to 8 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 07033; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Kenilworth, NJ

Summer high86 °Faverage high, July
Winter low25 °Faverage low, January
Hot days28days a year at 90 °F or more
Freezing nights111nights a year at 32 °F or less
Growing degree days3,648base 50 °F — the season’s usable heat
Longest day15 h 05 mindaylight on June 21
Shortest day9 h 15 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation50.4 inper year, rain and melted snow
Snowfall26 inper year; 31 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 40 °F, low 25 °F 40°25° JanFebruary: average high 43 °F, low 27 °F 43°27° FebMarch: average high 51 °F, low 33 °F 51°33° MarApril: average high 63 °F, low 43 °F 63°43° AprMay: average high 72 °F, low 53 °F 72°53° MayJune: average high 81 °F, low 62 °F 81°62° JunJuly: average high 86 °F, low 68 °F 86°68° JulAugust: average high 84 °F, low 66 °F 84°66° AugSeptember: average high 77 °F, low 59 °F 77°59° SepOctober: average high 66 °F, low 47 °F 66°47° OctNovember: average high 55 °F, low 38 °F 55°38° NovDecember: average high 45 °F, low 31 °F 45°31° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.73 in precipitation, 7 in snowfall 3.7❄7 JanFebruary: 3.26 in precipitation, 8.2 in snowfall 3.3❄8 FebMarch: 4.39 in precipitation, 5 in snowfall 4.4❄5 MarApril: 4.05 in precipitation, 0.3 in snowfall 4.0 AprMay: 4.20 in precipitation 4.2 MayJune: 4.54 in precipitation 4.5 JunJuly: 5.32 in precipitation 5.3 JulAugust: 4.14 in precipitation 4.1 AugSeptember: 4.25 in precipitation 4.3 SepOctober: 4.40 in precipitation 4.4 OctNovember: 3.63 in precipitation, 0.1 in snowfall 3.6 NovDecember: 4.48 in precipitation, 5.7 in snowfall 4.5❄6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Cranford, NJ (2 mi away); precipitation: Cranford, NJ (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

2 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

070617a
Plainfield, NJ · 1 mi
070917a
Westfield, NJ · 1 mi
072047b
Roselle Park, NJ · 1 mi
070837a
Union, NJ · 2 mi
070167a
Cranford, NJ · 2 mi
072037b
Roselle, NJ · 2 mi
070277a
Garwood, NJ · 3 mi
070817a
Springfield, NJ · 3 mi

New Jersey planting zones →

Questions about 07033

What planting zone is ZIP code 07033?

ZIP code 07033 (Kenilworth, NJ) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Kenilworth, NJ?

The median last spring frost (32 °F) near 07033 is April 11; after April 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cranford station.

When is the first frost in Kenilworth, NJ?

The median first fall frost near 07033 is October 31, giving a median frost-free growing season of 202 days.

When should I plant tomatoes in 07033?

Start tomato seeds indoors around Feb 14 – Feb 28 and set transplants outside around Apr 18 – May 2, one to three weeks after the median last frost.

How much rain and snow does 07033 get?

About 50.4 inches of precipitation a year and 26 inches of snowfall (NOAA 1991–2020 normals, Cranford station).

How hot do summers get in Kenilworth, NJ?

The average high peaks at 86 °F in July, with about 28 days a year at 90 °F or more.

What kind of soil does 07033 have?

The USDA soil survey maps Haledon at the center of ZIP 07033: loam, somewhat poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Kenilworth, NJ in 2026?

Spring leaf-out near 07033 came on Mar 22 in 2026, about the same as the 1991–2020 average (Mar 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Kenilworth, NJ?

Long-day onions: the longest day near 07033 is 15 h 05 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).