Northborough, Massachusetts, 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.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
You’re in Central Massachusetts
The inland heart of the state — rolling upland, cooler nights, and a shorter season than the coast. Stony glacial soils that reward the gardener who feeds and drains them.
Even in Northborough, 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 Northborough 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 Northborough — soil, climate, flood, and parcel records. How we handle your address.
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Northborough — the short answer
Northborough, Massachusetts: USDA zone 6b, about 199 days between hard freezes, across 2K 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 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~199
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 Northborough's average, not your lot's — a low corner or a tree line moves it. Against Northborough's 199-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Northborough
Each reading below is measured for Northborough itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNorthborough runs about 199 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
MeasuredNorthborough 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 Northborough is in
Northborough sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Northborough's own centroid rather than borrowed from Worcester County.
What Grows in Northborough
Every plant below cleared Northborough's own zone 6b and its 199-day season. Each card opens that plant's Massachusetts profile. How we score.
Is it too late to plant in Northborough?
Almost never — the real question is what to plant next. 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 25 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
Documented around Northborough
Spotted lanternfly documented 2 miles from Northborough, first recorded 2020. What to watch for.
What's on the federal record near Northborough
Closest first, within ~10 miles of Northborough. Listing isn't leaking, and distance isn't exposure.
- SARGENT RESIDENCEBrownfields · 1300 ft
- NORTHBORO OIL CO INCUnderground Storage Tanks · 2200 ft
- NORTHBORO MIDDLE SCHOOLUnderground Storage Tanks · 2300 ft
- CHOICE CLEANERSBrownfields · 2300 ft
- LINCOLN STREET SCHOOLUnderground Storage Tanks · 2600 ft
- NORTHBORO OIL COMPANYBrownfields · 2600 ft
- PEIRCE OIL & GAS INCUnderground Storage Tanks · 0.5 mi
- SUBRAHMANYAM KOTA IRREV TRUSTBrownfields · 0.6 mi
- Top EnergyUnderground Storage Tanks · 0.6 mi
- W C D GARAGE INCBrownfields · 0.6 mi
- FAY SCHOOL - FACILITIES DEPARTMENT GARAGEBrownfields · 0.6 mi
- SANDZ-E, LLC #MA0062Underground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Northborough'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 Northborough.
Sources Checked
within ~10 miles of Northborough
Severity Distribution
within ~10 miles of Northborough
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Northborough, two things run higher than the national average within ~10 miles of Northborough — Brownfields (1,605 sites) and Toxics Release Inventory (152 sites). That's not a problem with your land — it's information about it.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Northborough
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 Northborough average
Your land is one point inside Northborough
Everything above resolves to Northborough as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Northborough Average
Northborough Average
- ●USDA Zones 6b, averaged across Northborough
- ●One soil character for all of Northborough
- ●Frost dates read at Northborough's scale: Apr 9 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Northborough's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Northborough
Pull a site-specific report for your exact address in Northborough, Massachusetts — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Northborough averages can't show:
We read public map data around Northborough — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Northborough average
How we know this about Northborough
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 Northborough’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 Northborough
When does frost risk typically end in Northborough?
The last hard freeze (28°F) in Northborough 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 Northborough?
The first hard freeze (28°F) in Northborough 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 199 days after the spring freeze cleared.
How long is the growing season in Northborough?
Measured between 28°F hard freezes, Northborough sees about 199 frost-free days — roughly Apr 9 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 30 to Oct 11, about 164 days.
Is the soil safe to grow vegetables in Northborough?
The federal record around Northborough runs heavier than most — 2,473 documented sites, mostly Brownfields entries (1,605), the nearest Brownfields record about 0.3 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 Northborough?
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 Northborough's scale — its 6b band and its 199-day season. Your yard writes its own version of Northborough'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 Northborough’s own scale
7 of the readings below were taken at Northborough's own scale — its own ~199-day season between 28°F freezes, the 2,102 acres it covers and 2,473 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Northborough's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Northborough's own 28°F hard-freeze dates, about Apr 9 and Oct 25 and the ~199-day span between themNOAA 1991–2020 Climate Normals
- 2,473 documented contamination sites on the federal record near Northborough, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Northborough's boundary and the 2,102 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~199-day seasonGrowable Ground crop-matching engine
- The ecoregion at Northborough's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Northboroughlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Northborough's 2,102 acres read through its county's SSURGO summaryfrom Worcester County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Worcester County
- The growing challenges every Massachusetts grower plans around — written at state scale, so they stay on the state guidefrom Massachusetts
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Worcester County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Northborough's 2,102 acreswhy one lot differs from the next →
- Which side of Northborough you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,102 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.3 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 Northborough-wide figureread your own land →
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