Califon, New Jersey, sits in USDA hardiness zone 6b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
A short list that earns its place here — cabbage, blackberry, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Califon, 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 Califon 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 Califon — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Califon — the short answer
Califon, New Jersey: USDA zone 6b, about 195 days between hard freezes, across 614 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~195
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 614 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 6b is Califon's average, not your lot's — a low corner or a tree line moves it. Against Califon's 195-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Califon
Each reading below is measured for Califon itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCalifon runs about 195 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredCalifon sits in USDA hardiness zone 6b.
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 Califon is in
Califon sits in the Northeastern Highlands — EPA Level III, inside the wider Northern Forests. That is read at Califon's own centroid, and it is not what its county reads: Hunterdon County is mostly Northern Piedmont. The wider page above you is answering a different question about different ground.
What Grows in Califon
Every plant below cleared Califon's own zone 6b and its 195-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in Califon?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 13 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 25 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
Documented around Califon
Spotted lanternfly documented 1 miles from Califon, first recorded 2019. What to watch for.
What's on the federal record near Califon
Closest first, within ~10 miles of Califon. Listing isn't leaking, and distance isn't exposure.
- KEEFES CORNER INCORPORATEDUnderground Storage Tanks · 200 ft
- CALIFON FIRE COUnderground Storage Tanks · 400 ft
- PEAPACK-GLADSTONE BANKUnderground Storage Tanks · 450 ft
- DONALD A WRIGHT JRUnderground Storage Tanks · 500 ft
- COLEMANS GARAGE INCUnderground Storage Tanks · 750 ft
- 190254-- Dom-1980Nitrate · 1100 ft
- 190245-- PW 2Nitrate · 1600 ft
- GILMARTIN CAFEUnderground Storage Tanks · 2300 ft
- WALGREENS 19633Brownfields · 0.6 mi
- CALIFON EXXON INCUnderground Storage Tanks · 0.6 mi
- 190237-- Dom-1984Nitrate · 0.7 mi
- RAWCO INCUnderground Storage Tanks · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Califon'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 Califon.
Sources Checked
within ~10 miles of Califon
Severity Distribution
within ~10 miles of Califon
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Califon, two things run higher than the national average within ~10 miles of Califon — Superfund (22 sites) and PFAS (8 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.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Califon
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 Califon average
Your land is one point inside Califon
Everything above resolves to Califon as a whole — one PHZM band and one 28°F frost record, read across 614 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 Califon Average
Califon Average
- ●USDA Zones 6b, averaged across Califon
- ●One soil character for all of Califon
- ●Frost dates read at Califon's scale: Apr 13 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Califon's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Califon
Pull a site-specific report for your exact address in Califon, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Califon averages can't show:
We read public map data around Califon — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Califon average
How we know this about Califon
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 Califon’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 Califon
When does frost risk typically end in Califon?
The last hard freeze (28°F) in Califon typically lands around Apr 13, 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 May 4.
When is the first frost in Califon?
The first hard freeze (28°F) in Califon typically arrives around Oct 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 11, so the watching starts about Sep 25 — about 195 days after the spring freeze cleared.
How long is the growing season in Califon?
Measured between 28°F hard freezes, Califon sees about 195 frost-free days — roughly Apr 13 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 4 to Oct 11, about 160 days.
Is the soil safe to grow vegetables in Califon?
The federal record around Califon runs heavier than most — 753 documented sites, mostly Underground Storage Tanks entries (431), 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 Califon?
From about Sep 25 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 Oct 25 (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 Oct 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Califon's scale — its 6b band and its 195-day season. Your yard writes its own version of Califon'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 Califon’s own scale
7 of the readings below were taken at Califon's own scale — its own ~195-day season between 28°F freezes, the 614 acres it covers and 753 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Califon's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Califon's own 28°F hard-freeze dates, about Apr 13 and Oct 25 and the ~195-day span between themNOAA 1991–2020 Climate Normals
- 753 documented contamination sites on the federal record near Califon, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Califon's boundary and the 614 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~195-day seasonGrowable Ground crop-matching engine
- Califon sits in the Northeastern Highlands — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Califonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Califon's 614 acres read through its county's SSURGO summaryfrom Hunterdon County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Hunterdon 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 Hunterdon County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Califon's 614 acreswhy one lot differs from the next →
- Which side of Califon you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 614 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 Califon-wide figureread your own land →
More in New Jersey
Wider growing context
What grows across New JerseyCalifon sits outside our named growing regions, so New Jersey as a whole is its closest context here.
Nearby growing guides