South Plainfield, 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.
These conditions suit cabbage, hazelnut, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in South Plainfield, 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 South Plainfield 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 South Plainfield — soil, climate, flood, and parcel records. How we handle your address.
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South Plainfield — the short answer
South Plainfield, New Jersey: USDA zone 7a, about 228 days between hard freezes, across 5K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 12
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~228
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 5K 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 South Plainfield's average, not your lot's — a low corner or a tree line moves it. Against South Plainfield's 228-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in South Plainfield
Each reading below is measured for South Plainfield itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSouth Plainfield runs about 228 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
MeasuredSouth Plainfield 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 South Plainfield is in
South Plainfield sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at South Plainfield's own centroid, and it is not what its county reads: Middlesex County is mostly Atlantic Coastal Pine Barrens. The wider page above you is answering a different question about different ground.
What Grows in South Plainfield
Every plant below cleared South Plainfield's own zone 7a and its 228-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in South Plainfield?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 12 — 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 South Plainfield
Spotted lanternfly documented 4 miles from South Plainfield, first recorded 2019. What to watch for.
What's on the federal record near South Plainfield
Closest first, within ~10 miles of South Plainfield. Listing isn't leaking, and distance isn't exposure.
- TETLP-M&R 70057 PISCATAWAYBrownfields · 100 ft
- JERSEY OILUnderground Storage Tanks · 350 ft
- JOE NICASTRO'S GARAGEUnderground Storage Tanks · 500 ft
- CUSTOM CLEANERS & TAILORSSuperfund · 500 ft
- CORNELL DUBILIER ELECTRONICS INC.Superfund · 750 ft
- SUPERIOR HEAT TREATING @ 333 HAMILTON BLVD IND PKBrownfields · 950 ft
- SOUTH PLAINFIELD EMPIREUnderground Storage Tanks · 1200 ft
- NATIONAL WASTE CLEAN INC.Brownfields · 1600 ft
- BORO OF SOUTH PLAINFIELDUnderground Storage Tanks · 1700 ft
- ITRAN RUBBER CORPUnderground Storage Tanks · 1800 ft
- ROAD DEPT GARAGEUnderground Storage Tanks · 1800 ft
- NISCHWITZ & COUnderground Storage Tanks · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from South Plainfield'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 South Plainfield.
Total Sites
4,519
within ~10 miles of South Plainfield
Risk Level
High
Highest-severity
112 Superfund sites
Sources Checked
within ~10 miles of South Plainfield
Severity Distribution
within ~10 miles of South Plainfield
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around South Plainfield, two things run higher than the national average within ~10 miles of South Plainfield — Superfund (112 sites) and Toxics Release Inventory (345 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 South Plainfield
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 South Plainfield average
Your land is one point inside South Plainfield
Everything above resolves to South Plainfield as a whole — one PHZM band and one 28°F frost record, read across 5K 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 South Plainfield Average
South Plainfield Average
- ●USDA Zones 7a, averaged across South Plainfield
- ●One soil character for all of South Plainfield
- ●Frost dates read at South Plainfield's scale: Mar 29 to Nov 12
YOUR Parcel
- ✓Your exact zone, not South Plainfield's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in South Plainfield
Pull a site-specific report for your exact address in South Plainfield, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that South Plainfield averages can't show:
We read public map data around South Plainfield — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the South Plainfield average
How we know this about South Plainfield
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 South Plainfield’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 South Plainfield
When does frost risk typically end in South Plainfield?
The last hard freeze (28°F) in South Plainfield typically lands around Mar 29, 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 19.
When is the first frost in South Plainfield?
The first hard freeze (28°F) in South Plainfield typically arrives around Nov 12, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 29, so the watching starts about Oct 13 — about 228 days after the spring freeze cleared.
How long is the growing season in South Plainfield?
Measured between 28°F hard freezes, South Plainfield sees about 228 frost-free days — roughly Mar 29 through Nov 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 29, about 193 days.
Is the soil safe to grow vegetables in South Plainfield?
The federal record around South Plainfield runs heavier than most — 4,519 documented sites, mostly Underground Storage Tanks entries (2,609), the nearest Brownfields 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 South Plainfield?
From about Oct 13 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 12 (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 12. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at South Plainfield's scale — its 7a band and its 228-day season. Your yard writes its own version of South Plainfield'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 South Plainfield’s own scale
7 of the readings below were taken at South Plainfield's own scale — its own ~228-day season between 28°F freezes, the 5,309 acres it covers and 4,519 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- South Plainfield's own USDA hardiness band, zones 7aUSDA PHZM 2023
- South Plainfield's own 28°F hard-freeze dates, about Mar 29 and Nov 12 and the ~228-day span between themNOAA 1991–2020 Climate Normals
- 4,519 documented contamination sites on the federal record near South Plainfield, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- South Plainfield's boundary and the 5,309 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~228-day seasonGrowable Ground crop-matching engine
- South Plainfield sits in the Northern Piedmont — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of South Plainfieldlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so South Plainfield's 5,309 acres read through its county's SSURGO summaryfrom Middlesex County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Middlesex 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 Middlesex County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among South Plainfield's 5,309 acreswhy one lot differs from the next →
- Which side of South Plainfield you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,309 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 South Plainfield-wide figureread your own land →
More in New Jersey
Wider growing context
What grows across New JerseySouth Plainfield sits outside our named growing regions, so New Jersey as a whole is its closest context here.
Nearby growing guides