Harleysville, Pennsylvania, sits in USDA hardiness zone 7a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
A short list that earns its place here — cabbage, hazelnut, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Harleysville, 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 Harleysville 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 Harleysville — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Harleysville — the short answer
Harleysville, Pennsylvania: USDA zone 7a, about 213 days between hard freezes, across 3K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~213
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K 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 Harleysville's average, not your lot's — a low corner or a tree line moves it. Against Harleysville's 213-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Harleysville
Each reading below is measured for Harleysville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHarleysville runs about 213 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
MeasuredHarleysville 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 Harleysville is in
Harleysville sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Harleysville's own centroid rather than borrowed from Montgomery County.
What Grows in Harleysville
Every plant below cleared Harleysville's own zone 7a and its 213-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Harleysville?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 3 — 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 Harleysville
Spotted lanternfly documented 1 miles from Harleysville, first recorded 2016. What to watch for.
What's on the federal record near Harleysville
Closest first, within ~10 miles of Harleysville. Listing isn't leaking, and distance isn't exposure.
- LUKOIL 69236Underground Storage Tanks · 350 ft
- HARLEYSVILLE INSUnderground Storage Tanks · 800 ft
- NATIONWIDE MUTUAL INS CO/LOWER SALFORDBrownfields · 800 ft
- MARK TWAIN APTUnderground Storage Tanks · 950 ft
- HEAVENER SUPPLYUnderground Storage Tanks · 950 ft
- COMMERCIAL STORE FRONT BLDGUnderground Storage Tanks · 950 ft
- MOPAC DIV 19 21Underground Storage Tanks · 1100 ft
- MOYERS ELECUnderground Storage Tanks · 1100 ft
- MARCOR SVCUnderground Storage Tanks · 1300 ft
- MG 935Nitrate · 1600 ft
- HARLEYSVILLEUnderground Storage Tanks · 1800 ft
- JUST CRUISIN INCBrownfields · 1900 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Harleysville'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 Harleysville.
Sources Checked
within ~10 miles of Harleysville
Severity Distribution
within ~10 miles of Harleysville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Harleysville, two things run higher than the national average within ~10 miles of Harleysville — Toxics Release Inventory (105 sites) and Superfund (20 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Harleysville
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 Harleysville average
Your land is one point inside Harleysville
Everything above resolves to Harleysville as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Harleysville Average
Harleysville Average
- ●USDA Zones 7a, averaged across Harleysville
- ●One soil character for all of Harleysville
- ●Frost dates read at Harleysville's scale: Apr 4 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Harleysville's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Harleysville
Pull a site-specific report for your exact address in Harleysville, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Harleysville averages can't show:
We read public map data around Harleysville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Harleysville average
How we know this about Harleysville
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 Harleysville’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 Harleysville
When does frost risk typically end in Harleysville?
The last hard freeze (28°F) in Harleysville typically lands around Apr 4, 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 25.
When is the first frost in Harleysville?
The first hard freeze (28°F) in Harleysville typically arrives around Nov 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 20, so the watching starts about Oct 4 — about 213 days after the spring freeze cleared.
How long is the growing season in Harleysville?
Measured between 28°F hard freezes, Harleysville sees about 213 frost-free days — roughly Apr 4 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 20, about 178 days.
Is the soil safe to grow vegetables in Harleysville?
The federal record around Harleysville runs heavier than most — 1,561 documented sites, mostly Underground Storage Tanks entries (806), the nearest Underground Storage Tanks record under a tenth of a mile 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 Harleysville?
From about Oct 4 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 3 (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 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Harleysville's scale — its 7a band and its 213-day season. Your yard writes its own version of Harleysville'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 Harleysville’s own scale
7 of the readings below were taken at Harleysville's own scale — its own ~213-day season between 28°F freezes, the 2,673 acres it covers and 1,561 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Harleysville's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Harleysville's own 28°F hard-freeze dates, about Apr 4 and Nov 3 and the ~213-day span between themNOAA 1991–2020 Climate Normals
- 1,561 documented contamination sites on the federal record near Harleysville, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Harleysville's boundary and the 2,673 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~213-day seasonGrowable Ground crop-matching engine
- The ecoregion at Harleysville's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Harleysvillelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Harleysville's 2,673 acres read through its county's SSURGO summaryfrom Montgomery County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Montgomery County
- The growing challenges every Pennsylvania grower plans around — written at state scale, so they stay on the state guidefrom Pennsylvania
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Montgomery County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Harleysville's 2,673 acreswhy one lot differs from the next →
- Which side of Harleysville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,673 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Harleysville-wide figureread your own land →
More in Pennsylvania
Wider growing context
What grows across PennsylvaniaHarleysville sits outside our named growing regions, so Pennsylvania as a whole is its closest context here.
Nearby growing guides