The New Jersey Skylands (Northwest Highlands) spans USDA hardiness zone 6b — a zone band wide enough that plant choice, not possibility, is the interesting question.
The only corner of New Jersey a full USDA zone colder than the rest of the state: Sussex, Warren, and Morris sit in zone 6b while the coast and metro run 7a–7b. The Kittatinny ridge and the Highlands hold the frost-free season to roughly 196–206 days county-wide — mountain towns like High Point and Vernon shorter still — against 220–254 on the coastal plain. Cold-air drainage in the valleys pushes last frost weeks later and first frost weeks earlier, so any statewide 7a average would hand a grower here a warm-season window that isn't actually there. Plant to zone 6b and the tighter season, not to the state map. Among the crops suited to this profile: tomato, sweet corn, blueberry, and peach. The site-level story — soil, sun, drainage — decides the rest.
The New Jersey Skylands (Northwest Highlands) spans New Jersey.
Your yard isn't all of the New Jersey Skylands (Northwest Highlands).
The New Jersey Skylands (Northwest Highlands) spans USDA zones 6b, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 New Jersey Skylands (Northwest Highlands) — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
The New Jersey Skylands (Northwest Highlands) — the short answer
The New Jersey Skylands (Northwest Highlands): USDA zones 6b, 196–206 frost-free days, in New Jersey.
- USDA zones
- 6b
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 196–206 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 3
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. Where a region publishes no measured season, no season figure is shown.
Hardiness Zone Range
What Grows in the New Jersey Skylands (Northwest Highlands)
Plants matched to the New Jersey Skylands (Northwest Highlands)'s USDA zones 6b, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of the New Jersey Skylands (Northwest Highlands)
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the New Jersey Skylands (Northwest Highlands)’s USDA zones 6b — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across the New Jersey Skylands (Northwest Highlands)
The USDA soil survey maps this ground county by county. These are those records weighted by land area across three member counties — this region’s own profile, not a state figure.
The ground is predominantly Inceptisols, at 54% of mapped acres, followed by Ultisols (24%), Alfisols (16%) and Histosols (3%). Five soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Rockaway, Nassau, and Parker.
46% of those acres are well drained, and another 20% somewhat excessively drained, 8% moderately well drained. Topsoil pH runs 4.8–5.8 between the lowest and the highest county on record. 16% of the footprint is classed prime farmland.
Soil order
Inceptisols
Drainage
Well drained
Topsoil pH
4.8–5.8
Hydric soils
12%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Morris County holds the most wetland ground here, at 20% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the New Jersey Skylands (Northwest Highlands)
The soil survey reads this ground county by county, and the readings above are those records summed across the New Jersey Skylands (Northwest Highlands). Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records46% of the mapped acres across the New Jersey Skylands (Northwest Highlands) are well drained — ground that drains quickly. That is area-weighted across all three of its mapped counties.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across the New Jersey Skylands (Northwest Highlands) runs pH 4.8–5.8 — acidic in all three of them.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Safe to Grow Here?
What the federal record shows across the New Jersey Skylands (Northwest Highlands) — and how to grow with it.
Across the New Jersey Skylands (Northwest Highlands)'s 3 counties the federal record holds 4,529 documented sites, mostly Underground Storage Tanks (2,364), Nitrate (1,124) and Brownfields (726). The heaviest single county is Morris County, with 3,005.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to the New Jersey Skylands (Northwest Highlands) to see which records sit where you actually grow.
Sources Checked
Summed across the 3 counties in the New Jersey Skylands (Northwest Highlands)
A note from Gnorman
What an experienced grower watches for around here
In and around the New Jersey Skylands (Northwest Highlands), two things run higher than the national average across the 3 counties in the New Jersey Skylands (Northwest Highlands) — Superfund (94 sites) and PFAS (50 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.
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.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the New Jersey Skylands (Northwest Highlands)
Everything above resolves to the New Jersey Skylands (Northwest Highlands) as a whole — a footprint spanning USDA zones 6b. Your parcel sits in exactly one of them. 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 region 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 regional average.
Your Lot vs the New Jersey Skylands (Northwest Highlands) Average
New Jersey Skylands (Northwest Highlands) Average
- ●USDA Zones 6b, averaged across New Jersey Skylands (Northwest Highlands)
- ●One soil character for all of New Jersey Skylands (Northwest Highlands)
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not New Jersey Skylands (Northwest Highlands)'s 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the New Jersey Skylands (Northwest Highlands)
Pull a site-specific report for your exact address in the New Jersey Skylands (Northwest Highlands) — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that New Jersey Skylands (Northwest Highlands) averages can't show:
We read public map data around The New Jersey Skylands (Northwest Highlands) — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the New Jersey Skylands (Northwest Highlands) average
How we know this about the New Jersey Skylands (Northwest Highlands)
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about the New Jersey Skylands (Northwest Highlands)
What hardiness zone is the New Jersey Skylands (Northwest Highlands)?
The New Jersey Skylands (Northwest Highlands) spans USDA hardiness zones 6b, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in the New Jersey Skylands (Northwest Highlands)?
Measured between 28°F hard freezes, the New Jersey Skylands (Northwest Highlands)'s counties mostly run 197 to 202 frost-free days, median 198 (NOAA Regional Climate Centers ACIS, 1991–2020, over 3 member counties). That 5-day spread is the honest read — no single season describes 3 counties, and each county guide below carries its own.
When does frost risk end in the New Jersey Skylands (Northwest Highlands)?
Across the New Jersey Skylands (Northwest Highlands), the middle half of member counties see their last 28°F hard freeze between Apr 10 and Apr 11 (median Apr 11), and their first fall freeze between Oct 25 and Oct 29. Those are hard freezes, not the last light frost: tender transplants wait for about May 2, and elevation decides which end of a 1-day spread you garden in.
What grows well in the New Jersey Skylands (Northwest Highlands)?
The New Jersey Skylands (Northwest Highlands)'s conditions suit plants such as Tomato, Sweet Corn, Blueberry, Peach, Cranberry. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is the New Jersey Skylands (Northwest Highlands) defined?
The New Jersey Skylands (Northwest Highlands) is defined here as a curated cluster of 3 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does the New Jersey Skylands (Northwest Highlands) cover?
The New Jersey Skylands (Northwest Highlands) spans New Jersey. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Pine Barrens, North Jersey (Gateway / NYC-Metro Urban Corridor), and Delaware Bayshore share at least one state with the New Jersey Skylands (Northwest Highlands). Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at the New Jersey Skylands (Northwest Highlands)’s own scale
6 of the readings below were taken at the New Jersey Skylands (Northwest Highlands)'s own scale — the zone 6b band across its footprint, a median 198-day season across its 3 counties and 4,529 documented federal contamination records across its 3 counties, 3,005 of them in Morris County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 6b aggregated across all 3 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 3 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 3 counties run 197 to 202 frost-free days, median 198NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 4,529 documented federal contamination records across its 3 counties, 3,005 of them in Morris County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 54% Inceptisols, topsoil pH 4.8–5.8, area-weighted across its 3 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 6bfrom New Jersey
What this page can’t tell you
- Which end of the 5-day range your ground sits at — 197 days at one extreme, 202 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore the New Jersey Skylands (Northwest Highlands)
State growing guides
Counties in this region
Other growing regions across New Jersey
The vast eastern mountain region of steep hollows, thin acidic soils, and short upland seasons — apples, brambles, ramps, and forest crops on hard-won ground. (Union of the core Appalachian ecoregions.)
New Jersey's acidic, sandy Pinelands — nutrient-poor soils that nonetheless yield blueberries and cranberries at a commercial scale.
North Jersey's dense urban core — Jersey City, Hoboken, Newark, Fort Lee, Edgewater along the Hudson palisades — grows on a materially longer clock than the rest of the state. A strong urban heat island plus Hudson River and harbor moderation push Hudson County to 254 frost-free days at zone 7b — the highest of any New Jersey county and roughly 55 more than the northwest highlands (Sussex 196, Morris 198) — so an urban grower here can hold tender crops later into fall than the statewide 7a average implies. The growing reality here is also distinct from the farm-belt siblings: rooftop, balcony, and community-plot horticulture rather than open acreage.
Where New Jersey's farmland runs down to the tidal marshes of Delaware Bay — a warmer, produce-growing coastal plain that reads nothing like the acidic Pinelands just to the east. Salem and Cumberland counties are the heart of the state's truck-farming country, the ground where the Jersey tomato and the Seabrook Farms vegetable belt took root, and the bay's marine moderation stretches Salem County's frost-free window to 244 days — the longest of any farm county in New Jersey (county_data.json). All three bayshore counties sit in a uniform 7b band, so every parcel here is scored on its own bay-moderated season rather than a regional average that would blend in the colder, sandier pine interior.