Millstone, 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.
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 Millstone, 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 Millstone 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 Millstone — soil, climate, flood, and parcel records. How we handle your address.
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Millstone — the short answer
Millstone, New Jersey: USDA zone 7a, about 216 days between hard freezes, across 436 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~216
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 436 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 Millstone's average, not your lot's — a low corner or a tree line moves it. Against Millstone's 216-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Millstone
Each reading below is measured for Millstone itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMillstone runs about 216 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
MeasuredMillstone 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 Millstone is in
Millstone sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Millstone's own centroid rather than borrowed from Somerset County.
What Grows in Millstone
Every plant below cleared Millstone's own zone 7a and its 216-day season. Each card opens that plant's New Jersey profile. How we score.
Is it too late to plant in Millstone?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 5; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 4 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Millstone
Spotted lanternfly documented 3 miles from Millstone, first recorded 2019. What to watch for.
What's on the federal record near Millstone
Closest first, within ~10 miles of Millstone. Listing isn't leaking, and distance isn't exposure.
- MILLSTONE RD DEPT GARAGEUnderground Storage Tanks · 1900 ft
- MILLSTONE GETTYUnderground Storage Tanks · 2200 ft
- CONOCOUnderground Storage Tanks · 2200 ft
- D&R CANAL STATE PARKUnderground Storage Tanks · 0.6 mi
- MILLSTONE GARAGEUnderground Storage Tanks · 0.8 mi
- PHOENIX FARMSuperfund · 1.0 mi
- HILLSBOROUGH TECHNOLOGYUnderground Storage Tanks · 1.3 mi
- FRANK D VALCHECK INCUnderground Storage Tanks · 1.3 mi
- D&L CONTRACTING CO INCUnderground Storage Tanks · 1.5 mi
- CARRIAGE FARM LLCUnderground Storage Tanks · 1.7 mi
- LENAPE INDUSTRIES INCBrownfields · 1.8 mi
- LENAPE INDUSTRIES INCToxics Release Inventory · 1.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Millstone'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 Millstone.
Sources Checked
within ~10 miles of Millstone
Severity Distribution
within ~10 miles of Millstone
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Millstone, two things run higher than the national average within ~10 miles of Millstone — Superfund (65 sites) and Toxics Release Inventory (176 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 Millstone
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 Millstone average
Your land is one point inside Millstone
Everything above resolves to Millstone as a whole — one PHZM band and one 28°F frost record, read across 436 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 Millstone Average
Millstone Average
- ●USDA Zones 7a, averaged across Millstone
- ●One soil character for all of Millstone
- ●Frost dates read at Millstone's scale: Apr 2 to Nov 4
YOUR Parcel
- ✓Your exact zone, not Millstone's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Millstone
Pull a site-specific report for your exact address in Millstone, New Jersey — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Millstone averages can't show:
We read public map data around Millstone — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Millstone average
How we know this about Millstone
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 Millstone’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 Millstone
When does frost risk typically end in Millstone?
The last hard freeze (28°F) in Millstone typically lands around Apr 2, 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 23.
When is the first frost in Millstone?
The first hard freeze (28°F) in Millstone typically arrives around Nov 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 21, so the watching starts about Oct 5 — about 216 days after the spring freeze cleared.
How long is the growing season in Millstone?
Measured between 28°F hard freezes, Millstone sees about 216 frost-free days — roughly Apr 2 through Nov 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 23 to Oct 21, about 181 days.
Is the soil safe to grow vegetables in Millstone?
The federal record around Millstone runs heavier than most — 2,244 documented sites, mostly Underground Storage Tanks entries (1,170), the nearest Underground Storage Tanks record about 0.4 miles 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 Millstone?
From about Oct 5 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 4 (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 4. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Millstone's scale — its 7a band and its 216-day season. Your yard writes its own version of Millstone'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 Millstone’s own scale
7 of the readings below were taken at Millstone's own scale — its own ~216-day season between 28°F freezes, the 436 acres it covers and 2,244 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Millstone's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Millstone's own 28°F hard-freeze dates, about Apr 2 and Nov 4 and the ~216-day span between themNOAA 1991–2020 Climate Normals
- 2,244 documented contamination sites on the federal record near Millstone, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Millstone's boundary and the 436 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~216-day seasonGrowable Ground crop-matching engine
- The ecoregion at Millstone's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Millstonelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Millstone's 436 acres read through its county's SSURGO summaryfrom Somerset County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Somerset 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 Somerset County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Millstone's 436 acreswhy one lot differs from the next →
- Which side of Millstone you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 436 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Millstone-wide figureread your own land →
More in New Jersey
Wider growing context
What grows across New JerseyMillstone sits outside our named growing regions, so New Jersey as a whole is its closest context here.
Nearby growing guides