Harwich Center, Massachusetts, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
These conditions suit cabbage, prickly pear, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
You’re in Cape Cod & the Islands
A sandy, sea-wrapped peninsula and islands with the state's warmest, longest season — and its most maritime one. Acidic soils long worked for cranberries and beach plums; wind and salt are the constant neighbors of every garden.
Even in Harwich Center, 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 Harwich Center 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 Harwich Center — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Harwich Center — the short answer
Harwich Center, Massachusetts: USDA zone 7b, about 237 days between hard freezes, across 1K acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~237
- 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 7b is Harwich Center's average, not your lot's — a low corner or a tree line moves it. Against Harwich Center's 237-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Harwich Center
Each reading below is measured for Harwich Center itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHarwich Center runs about 237 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
MeasuredHarwich Center sits in USDA hardiness zone 7b.
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 Harwich Center is in
Harwich Center sits in the Atlantic Coastal Pine Barrens — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Harwich Center's own centroid rather than borrowed from Barnstable County.
What Grows in Harwich Center
Every plant below cleared Harwich Center's own zone 7b and its 237-day season. Each card opens that plant's Massachusetts profile. How we score.
Is it too late to plant in Harwich Center?
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 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 22 — 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 Harwich Center
Spotted lanternfly documented 16 miles from Harwich Center, first recorded 2022. What to watch for.
What's on the federal record near Harwich Center
Closest first, within ~10 miles of Harwich Center. Listing isn't leaking, and distance isn't exposure.
- CRANBERRY VALLEY GOLF COURSEUnderground Storage Tanks · 2400 ft
- CAPE COD REG TECH HIGH SCHOOLUnderground Storage Tanks · 2400 ft
- HARWICH MOBILUnderground Storage Tanks · 0.5 mi
- Harwich Gas & PropaneUnderground Storage Tanks · 0.5 mi
- BOURNE PETROLEUM DBA HARWICH PUBLIC MARKETBrownfields · 0.6 mi
- VERIZON MASSACHUSETTS #531507Underground Storage Tanks · 0.6 mi
- GETTY #30615Underground Storage Tanks · 0.6 mi
- HARWICH WATER DEPARTMENTPFAS · 0.7 mi
- PEREEZ LUCIAN JBrownfields · 0.7 mi
- BROOKS ACADEMYBrownfields · 0.7 mi
- MA-HJW 55Nitrate · 0.8 mi
- MA-HJW 49Nitrate · 0.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Harwich Center'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 Harwich Center.
Total Sites
769
within ~10 miles of Harwich Center
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Harwich Center
Severity Distribution
within ~10 miles of Harwich Center
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Harwich Center, Nitrate runs higher than the national average — 348 sites within ~10 miles of Harwich Center. That's not a problem with your land — it's information about it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Harwich Center
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 Harwich Center average
Your land is one point inside Harwich Center
Everything above resolves to Harwich Center 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 Harwich Center Average
Harwich Center Average
- ●USDA Zones 7b, averaged across Harwich Center
- ●One soil character for all of Harwich Center
- ●Frost dates read at Harwich Center's scale: Mar 30 to Nov 22
YOUR Parcel
- ✓Your exact zone, not Harwich Center's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Harwich Center
Pull a site-specific report for your exact address in Harwich Center, Massachusetts — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Harwich Center averages can't show:
We read public map data around Harwich Center — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Harwich Center average
How we know this about Harwich Center
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 Harwich Center’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 Harwich Center
When does frost risk typically end in Harwich Center?
The last hard freeze (28°F) in Harwich Center typically lands around Mar 30, 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 20.
When is the first frost in Harwich Center?
The first hard freeze (28°F) in Harwich Center typically arrives around Nov 22, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 8, so the watching starts about Oct 23 — about 237 days after the spring freeze cleared.
How long is the growing season in Harwich Center?
Measured between 28°F hard freezes, Harwich Center sees about 237 frost-free days — roughly Mar 30 through Nov 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 20 to Nov 8, about 202 days.
Is the soil safe to grow vegetables in Harwich Center?
The federal record around Harwich Center is a meaningful one — 769 documented sites, mostly Nitrate entries (348), the nearest Underground Storage Tanks record about 0.5 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 Harwich Center?
From about Oct 23 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 22 (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 22. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Harwich Center's scale — its 7b band and its 237-day season. Your yard writes its own version of Harwich Center'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 Harwich Center’s own scale
7 of the readings below were taken at Harwich Center's own scale — its own ~237-day season between 28°F freezes, the 1,439 acres it covers and 769 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Harwich Center's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Harwich Center's own 28°F hard-freeze dates, about Mar 30 and Nov 22 and the ~237-day span between themNOAA 1991–2020 Climate Normals
- 769 documented contamination sites on the federal record near Harwich Center, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Harwich Center's boundary and the 1,439 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~237-day seasonGrowable Ground crop-matching engine
- The ecoregion at Harwich Center's own centroid, the Atlantic Coastal Pine BarrensUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Harwich Centerlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Harwich Center's 1,439 acres read through its county's SSURGO summaryfrom Barnstable County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Barnstable 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 Barnstable County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Harwich Center's 1,439 acreswhy one lot differs from the next →
- Which side of Harwich Center you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,439 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Harwich Center-wide figureread your own land →