Hammonton, New Jersey, sits in USDA hardiness zone 7a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Hammonton, 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 Hammonton 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 Hammonton — soil, climate, flood, and parcel records. How we handle your address.
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Hammonton — the short answer
Hammonton, New Jersey: USDA zone 7a, about 219 days between hard freezes, across 26K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~219
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 26K 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 Hammonton's average, not your lot's — a low corner or a tree line moves it. Against Hammonton's 219-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hammonton
Each reading below is measured for Hammonton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHammonton runs about 219 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
MeasuredHammonton 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 Hammonton is in
Hammonton sits in the Atlantic Coastal Pine Barrens — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Hammonton's own centroid rather than borrowed from Atlantic County.
What Grows in Hammonton
Every plant below cleared Hammonton's own zone 7a and its 219-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in Hammonton?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 6 — 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 Hammonton
Spotted lanternfly documented 3 miles from Hammonton, first recorded 2019. What to watch for.
What's on the federal record near Hammonton
Closest first, within ~10 miles of Hammonton. Listing isn't leaking, and distance isn't exposure.
- 010309-- Well 1ANitrate · 1100 ft
- 010325-- Irr 2ANitrate · 1200 ft
- COLUMBIA FRUIT FARMS INCUnderground Storage Tanks · 1300 ft
- 011404-- MW54Nitrate · 0.6 mi
- RED BARN INCUnderground Storage Tanks · 0.8 mi
- RF DEMARCO NURSERY INCORPORATEDUnderground Storage Tanks · 1.0 mi
- 134 MIDDLE ROADUnderground Storage Tanks · 1.1 mi
- F&M DIBONA CONSTRUCTION INCUnderground Storage Tanks · 1.1 mi
- 206 PROPERTIES LLCUnderground Storage Tanks · 1.1 mi
- 010331-- OW 50Nitrate · 1.1 mi
- 010349-- Mullica 2DNitrate · 1.2 mi
- 012299-- SUSCP02 ReplNitrate · 1.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hammonton'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 Hammonton.
Sources Checked
within ~10 miles of Hammonton
Severity Distribution
within ~10 miles of Hammonton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hammonton, two things run higher than the national average within ~10 miles of Hammonton — Nitrate (422 sites) and Superfund (15 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Hammonton
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 Hammonton average
Your land is one point inside Hammonton
Everything above resolves to Hammonton as a whole — one PHZM band and one 28°F frost record, read across 26K 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 Hammonton Average
Hammonton Average
- ●USDA Zones 7a, averaged across Hammonton
- ●One soil character for all of Hammonton
- ●Frost dates read at Hammonton's scale: Apr 1 to Nov 6
YOUR Parcel
- ✓Your exact zone, not Hammonton's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hammonton
Pull a site-specific report for your exact address in Hammonton, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hammonton averages can't show:
We read public map data around Hammonton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hammonton average
How we know this about Hammonton
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 Hammonton’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 Hammonton
When does frost risk typically end in Hammonton?
The last hard freeze (28°F) in Hammonton typically lands around Apr 1, 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 22.
When is the first frost in Hammonton?
The first hard freeze (28°F) in Hammonton typically arrives around Nov 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 23, so the watching starts about Oct 7 — about 219 days after the spring freeze cleared.
How long is the growing season in Hammonton?
Measured between 28°F hard freezes, Hammonton sees about 219 frost-free days — roughly Apr 1 through Nov 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Oct 23, about 184 days.
Is the soil safe to grow vegetables in Hammonton?
The federal record around Hammonton is a meaningful one — 763 documented sites, mostly Nitrate entries (422), the nearest Nitrate record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Hammonton?
From about Oct 7 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 6 (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 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Hammonton's scale — its 7a band and its 219-day season. Your yard writes its own version of Hammonton'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 Hammonton’s own scale
7 of the readings below were taken at Hammonton's own scale — its own ~219-day season between 28°F freezes, the 26,079 acres it covers and 763 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hammonton's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Hammonton's own 28°F hard-freeze dates, about Apr 1 and Nov 6 and the ~219-day span between themNOAA 1991–2020 Climate Normals
- 763 documented contamination sites on the federal record near Hammonton, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Hammonton's boundary and the 26,079 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~219-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hammonton's own centroid, the Atlantic Coastal Pine BarrensUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Hammontonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Hammonton's 26,079 acres read through its county's SSURGO summaryfrom Atlantic County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Atlantic 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 Atlantic County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hammonton's 26,079 acreswhy one lot differs from the next →
- Which side of Hammonton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 26,079 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.2 miles 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 Hammonton-wide figureread your own land →
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