Kenilworth, New Jersey, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with cabbage, hazelnut, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Kenilworth, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Kenilworth lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Kenilworth — soil, climate, flood, and parcel records. How we handle your address.
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Kenilworth — the short answer
Kenilworth, New Jersey: USDA zone 7a, about 237 days between hard freezes, across 1K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~237
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 7a is Kenilworth's average, not your lot's — a low corner or a tree line moves it. Against Kenilworth's 237-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Kenilworth
Each reading below is measured for Kenilworth itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredKenilworth runs about 237 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredKenilworth sits in USDA hardiness zone 7a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Kenilworth is in
Kenilworth sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Kenilworth's own centroid rather than borrowed from Union County.
What Grows in Kenilworth
Every plant below cleared Kenilworth's own zone 7a and its 237-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in Kenilworth?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 18 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Kenilworth
Spotted lanternfly documented 4 miles from Kenilworth, first recorded 2019. What to watch for.
What's on the federal record near Kenilworth
Closest first, within ~10 miles of Kenilworth. Listing isn't leaking, and distance isn't exposure.
- UNITED CRANE & SHOVEL SERVICE COMPANYUnderground Storage Tanks · 350 ft
- THS INDUSTRIESUnderground Storage Tanks · 450 ft
- SUNOCO 0006-9864Underground Storage Tanks · 500 ft
- GULFUnderground Storage Tanks · 500 ft
- RUESCH MACHINE CO INCBrownfields · 500 ft
- PRESCISION ELEVATORBrownfields · 600 ft
- CHEMICOTE PAINT COMPANY INCORPORATED FORMERUnderground Storage Tanks · 600 ft
- POLICE DEPARTMENTUnderground Storage Tanks · 750 ft
- SYNRAY CORPORATIONBrownfields · 1000 ft
- SYNRAY CORPORATIONToxics Release Inventory · 1000 ft
- ACME #1096Brownfields · 1300 ft
- FORMER C&D SERVICE CENTERUnderground Storage Tanks · 1500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Kenilworth's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Kenilworth.
Sources Checked
within ~10 miles of Kenilworth
Severity Distribution
within ~10 miles of Kenilworth
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Kenilworth, two things run higher than the national average within ~10 miles of Kenilworth — Superfund (153 sites) and Underground Storage Tanks (3,997 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Kenilworth
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Kenilworth average
Your land is one point inside Kenilworth
Everything above resolves to Kenilworth as a whole — one PHZM band and one 28°F frost record, read across 1K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Kenilworth Average
Kenilworth Average
- ●USDA Zones 7a, averaged across Kenilworth
- ●One soil character for all of Kenilworth
- ●Frost dates read at Kenilworth's scale: Mar 26 to Nov 18
YOUR Parcel
- ✓Your exact zone, not Kenilworth's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Kenilworth
Pull a site-specific report for your exact address in Kenilworth, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Kenilworth averages can't show:
We read public map data around Kenilworth — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Kenilworth average
How we know this about Kenilworth
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Kenilworth’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Kenilworth
When does frost risk typically end in Kenilworth?
The last hard freeze (28°F) in Kenilworth typically lands around Mar 26, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Apr 16.
When is the first frost in Kenilworth?
The first hard freeze (28°F) in Kenilworth typically arrives around Nov 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 4, so the watching starts about Oct 19 — about 237 days after the spring freeze cleared.
How long is the growing season in Kenilworth?
Measured between 28°F hard freezes, Kenilworth sees about 237 frost-free days — roughly Mar 26 through Nov 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 16 to Nov 4, about 202 days.
Is the soil safe to grow vegetables in Kenilworth?
The federal record around Kenilworth runs heavier than most — 6,316 documented sites, mostly Underground Storage Tanks entries (3,997), the nearest Underground Storage Tanks record under a tenth of a mile out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Kenilworth?
From about Oct 19 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Nov 18 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Nov 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Kenilworth's scale — its 7a band and its 237-day season. Your yard writes its own version of Kenilworth's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Kenilworth’s own scale
7 of the readings below were taken at Kenilworth's own scale — its own ~237-day season between 28°F freezes, the 1,374 acres it covers and 6,316 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Kenilworth's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Kenilworth's own 28°F hard-freeze dates, about Mar 26 and Nov 18 and the ~237-day span between themNOAA 1991–2020 Climate Normals
- 6,316 documented contamination sites on the federal record near Kenilworth, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Kenilworth's boundary and the 1,374 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~237-day seasonGrowable Ground crop-matching engine
- The ecoregion at Kenilworth's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Kenilworthlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Kenilworth's 1,374 acres read through its county's SSURGO summaryfrom Union County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Union County
- The growing challenges every New Jersey grower plans around — written at state scale, so they stay on the state guidefrom New Jersey
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Union County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Kenilworth's 1,374 acreswhy one lot differs from the next →
- Which side of Kenilworth you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,374 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Kenilworth-wide figureread your own land →