Marksboro, New Jersey, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Well-matched crops include cabbage, hazelnut, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Marksboro, 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 Marksboro 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 Marksboro — soil, climate, flood, and parcel records. How we handle your address.
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Marksboro — the short answer
Marksboro, New Jersey: USDA zone 6b, about 202 days between hard freezes, across 1K acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~202
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 Marksboro's average, not your lot's — a low corner or a tree line moves it. Against Marksboro's 202-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Marksboro
Each reading below is measured for Marksboro itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMarksboro runs about 202 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
MeasuredMarksboro 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 Marksboro is in
Marksboro sits in the Ridge and Valley — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Marksboro's own centroid rather than borrowed from Warren County.
What Grows in Marksboro
Every plant below cleared Marksboro's own zone 6b and its 202-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in Marksboro?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 12; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 9 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 28 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Marksboro
Spotted lanternfly documented 2 miles from Marksboro, first recorded 2021. What to watch for.
What's on the federal record near Marksboro
Closest first, within ~10 miles of Marksboro. Listing isn't leaking, and distance isn't exposure.
- 410277-- DomNitrate · 2300 ft
- HG RYDELL LLCUnderground Storage Tanks · 0.6 mi
- ABANDONED HOUSEUnderground Storage Tanks · 0.7 mi
- JAMES ALEXANDER CORPToxics Release Inventory · 1.3 mi
- JAMES ALEXANDER CORPBrownfields · 1.3 mi
- KURT AUTO REPAIRUnderground Storage Tanks · 1.6 mi
- CHRUSZ'S GENERAL STOREUnderground Storage Tanks · 1.7 mi
- TOWN HALL & TOWN GARAGEUnderground Storage Tanks · 1.7 mi
- DELAWARE VALLEY TRANSPORTATION(FORMER)Underground Storage Tanks · 1.9 mi
- JERSEY GYPSUMUnderground Storage Tanks · 1.9 mi
- ZENOCK'S SPORTS SHOPUnderground Storage Tanks · 1.9 mi
- 410233-- SchNitrate · 1.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Marksboro'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 Marksboro.
Total Sites
470
within ~10 miles of Marksboro
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Marksboro
Severity Distribution
within ~10 miles of Marksboro
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Marksboro, two things run higher than the national average within ~10 miles of Marksboro — PFAS (6 sites) and Nitrate (156 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Marksboro
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 Marksboro average
Your land is one point inside Marksboro
Everything above resolves to Marksboro as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Marksboro Average
Marksboro Average
- ●USDA Zones 6b, averaged across Marksboro
- ●One soil character for all of Marksboro
- ●Frost dates read at Marksboro's scale: Apr 9 to Oct 28
YOUR Parcel
- ✓Your exact zone, not Marksboro's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Marksboro
Pull a site-specific report for your exact address in Marksboro, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Marksboro averages can't show:
We read public map data around Marksboro — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Marksboro average
How we know this about Marksboro
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 Marksboro’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 Marksboro
When does frost risk typically end in Marksboro?
The last hard freeze (28°F) in Marksboro typically lands around Apr 9, 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 30.
When is the first frost in Marksboro?
The first hard freeze (28°F) in Marksboro typically arrives around Oct 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 14, so the watching starts about Sep 28 — about 202 days after the spring freeze cleared.
How long is the growing season in Marksboro?
Measured between 28°F hard freezes, Marksboro sees about 202 frost-free days — roughly Apr 9 through Oct 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 30 to Oct 14, about 167 days.
Is the soil safe to grow vegetables in Marksboro?
The federal record around Marksboro is a meaningful one — 470 documented sites, mostly Underground Storage Tanks entries (245), the nearest Nitrate record about 0.4 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 Marksboro?
From about Sep 28 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 28 (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 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Marksboro's scale — its 6b band and its 202-day season. Your yard writes its own version of Marksboro'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 Marksboro’s own scale
7 of the readings below were taken at Marksboro's own scale — its own ~202-day season between 28°F freezes, the 1,377 acres it covers and 470 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Marksboro's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Marksboro's own 28°F hard-freeze dates, about Apr 9 and Oct 28 and the ~202-day span between themNOAA 1991–2020 Climate Normals
- 470 documented contamination sites on the federal record near Marksboro, the closest Nitrate record about 0.4 miles out from the town centreFederal environmental registers
- Marksboro's boundary and the 1,377 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~202-day seasonGrowable Ground crop-matching engine
- The ecoregion at Marksboro's own centroid, the Ridge and ValleyUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Marksborolydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Marksboro's 1,377 acres read through its county's SSURGO summaryfrom Warren County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Warren 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 Warren County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Marksboro's 1,377 acreswhy one lot differs from the next →
- Which side of Marksboro you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,377 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.4 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 Marksboro-wide figureread your own land →