Westfield, New Jersey, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
The conditions favor cabbage, hazelnut, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Westfield, 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 Westfield 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 Westfield — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Westfield — the short answer
Westfield, New Jersey: USDA zone 7a, about 232 days between hard freezes, across 4K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~232
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 4K 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 Westfield's average, not your lot's — a low corner or a tree line moves it. Against Westfield's 232-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Westfield
Each reading below is measured for Westfield itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWestfield runs about 232 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
MeasuredWestfield 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 Westfield is in
Westfield sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Westfield's own centroid rather than borrowed from Union County.
What Grows in Westfield
Every plant below cleared Westfield's own zone 7a and its 232-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in Westfield?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 14 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Westfield
Spotted lanternfly documented 2 miles from Westfield, first recorded 2019. What to watch for.
What's on the federal record near Westfield
Closest first, within ~10 miles of Westfield. Listing isn't leaking, and distance isn't exposure.
- 236 ELMER STREETUnderground Storage Tanks · 250 ft
- UNION CNTY PROSECUTORS FORENSIC LABBrownfields · 450 ft
- VENNERI COMPLEXUnderground Storage Tanks · 450 ft
- SIRRON INCUnderground Storage Tanks · 700 ft
- SHELL SERVICE STATION 8970 1101Underground Storage Tanks · 700 ft
- WATTERSON CIRCLEUnderground Storage Tanks · 800 ft
- DELTAUnderground Storage Tanks · 800 ft
- SUNOCO 0006-9104Underground Storage Tanks · 900 ft
- WESTFIELD STATION FIDELCO, LPBrownfields · 900 ft
- RACEWAY WESTFIELDUnderground Storage Tanks · 950 ft
- JD & SONS AUTO & TRUCK REPAIRUnderground Storage Tanks · 1000 ft
- WESTFIELD MART RPC 26Underground Storage Tanks · 1100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Westfield'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 Westfield.
Sources Checked
within ~10 miles of Westfield
Severity Distribution
within ~10 miles of Westfield
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Westfield, two things run higher than the national average within ~10 miles of Westfield — Superfund (122 sites) and Toxics Release Inventory (371 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Westfield
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 Westfield average
Your land is one point inside Westfield
Everything above resolves to Westfield as a whole — one PHZM band and one 28°F frost record, read across 4K 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 Westfield Average
Westfield Average
- ●USDA Zones 7a, averaged across Westfield
- ●One soil character for all of Westfield
- ●Frost dates read at Westfield's scale: Mar 27 to Nov 14
YOUR Parcel
- ✓Your exact zone, not Westfield's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Westfield
Pull a site-specific report for your exact address in Westfield, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Westfield averages can't show:
We read public map data around Westfield — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Westfield average
How we know this about Westfield
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 Westfield’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 Westfield
When does frost risk typically end in Westfield?
The last hard freeze (28°F) in Westfield typically lands around Mar 27, 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 17.
When is the first frost in Westfield?
The first hard freeze (28°F) in Westfield typically arrives around Nov 14, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 31, so the watching starts about Oct 15 — about 232 days after the spring freeze cleared.
How long is the growing season in Westfield?
Measured between 28°F hard freezes, Westfield sees about 232 frost-free days — roughly Mar 27 through Nov 14, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 17 to Oct 31, about 197 days.
Is the soil safe to grow vegetables in Westfield?
The federal record around Westfield runs heavier than most — 5,310 documented sites, mostly Underground Storage Tanks entries (3,306), 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 Westfield?
From about Oct 15 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 14 (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 14. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Westfield's scale — its 7a band and its 232-day season. Your yard writes its own version of Westfield'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 Westfield’s own scale
7 of the readings below were taken at Westfield's own scale — its own ~232-day season between 28°F freezes, the 4,303 acres it covers and 5,310 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Westfield's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Westfield's own 28°F hard-freeze dates, about Mar 27 and Nov 14 and the ~232-day span between themNOAA 1991–2020 Climate Normals
- 5,310 documented contamination sites on the federal record near Westfield, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Westfield's boundary and the 4,303 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~232-day seasonGrowable Ground crop-matching engine
- The ecoregion at Westfield's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Westfieldlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Westfield's 4,303 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 Westfield's 4,303 acreswhy one lot differs from the next →
- Which side of Westfield you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,303 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 Westfield-wide figureread your own land →