Pennwyn, Pennsylvania, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Among the crops suited to this profile: cabbage, hazelnut, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Pennwyn, 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 Pennwyn 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 Pennwyn — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Pennwyn — the short answer
Pennwyn, Pennsylvania: USDA zone 7a, about 218 days between hard freezes, across 340 acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~218
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 340 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 Pennwyn's average, not your lot's — a low corner or a tree line moves it. Against Pennwyn's 218-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Pennwyn
Each reading below is measured for Pennwyn itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredPennwyn runs about 218 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
MeasuredPennwyn 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 Pennwyn is in
Pennwyn sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Pennwyn's own centroid, and it is not what its county reads: Berks County is mostly Ridge and Valley. The wider page above you is answering a different question about different ground.
What Grows in Pennwyn
Every plant below cleared Pennwyn's own zone 7a and its 218-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Pennwyn?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 7 — 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 Pennwyn
Spotted lanternfly documented 2 miles from Pennwyn, first recorded 2017. What to watch for.
What's on the federal record near Pennwyn
Closest first, within ~10 miles of Pennwyn. Listing isn't leaking, and distance isn't exposure.
- PA 0442 308 E WYOMISSING AVEUnderground Storage Tanks · 1500 ft
- ROGERS GARAGE INCUnderground Storage Tanks · 1500 ft
- PRECIOUS BLOOD CONVENTUnderground Storage Tanks · 1600 ft
- PALM & SONS INCUnderground Storage Tanks · 1600 ft
- BORDEN INC SNACKS & INTERNATIONAL PRODUCTSToxics Release Inventory · 2200 ft
- GOODS GREENHOUSESUnderground Storage Tanks · 0.6 mi
- CE LEVAN & SON EXCAVATINGUnderground Storage Tanks · 0.6 mi
- FLOYD GEBHART FLOOR COVERINGUnderground Storage Tanks · 0.6 mi
- DIEBOLT LANDSCAPE COUnderground Storage Tanks · 0.6 mi
- HERBS GREENHOUSEUnderground Storage Tanks · 0.6 mi
- ED GOTTSCHALLS AUTO SVCUnderground Storage Tanks · 0.6 mi
- PRECISION GRAPHICS INCUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Pennwyn'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 Pennwyn.
Sources Checked
within ~10 miles of Pennwyn
Severity Distribution
within ~10 miles of Pennwyn
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Pennwyn, two things run higher than the national average within ~10 miles of Pennwyn — PFAS (14 sites) and Toxics Release Inventory (100 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.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Pennwyn
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 Pennwyn average
Your land is one point inside Pennwyn
Everything above resolves to Pennwyn as a whole — one PHZM band and one 28°F frost record, read across 340 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 Pennwyn Average
Pennwyn Average
- ●USDA Zones 7a, averaged across Pennwyn
- ●One soil character for all of Pennwyn
- ●Frost dates read at Pennwyn's scale: Apr 3 to Nov 7
YOUR Parcel
- ✓Your exact zone, not Pennwyn's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Pennwyn
Pull a site-specific report for your exact address in Pennwyn, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Pennwyn averages can't show:
We read public map data around Pennwyn — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Pennwyn average
How we know this about Pennwyn
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 Pennwyn’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 Pennwyn
When does frost risk typically end in Pennwyn?
The last hard freeze (28°F) in Pennwyn typically lands around Apr 3, 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 24.
When is the first frost in Pennwyn?
The first hard freeze (28°F) in Pennwyn typically arrives around Nov 7, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 24, so the watching starts about Oct 8 — about 218 days after the spring freeze cleared.
How long is the growing season in Pennwyn?
Measured between 28°F hard freezes, Pennwyn sees about 218 frost-free days — roughly Apr 3 through Nov 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 24, about 183 days.
Is the soil safe to grow vegetables in Pennwyn?
The federal record around Pennwyn runs heavier than most — 1,519 documented sites, mostly Underground Storage Tanks entries (840), the nearest Underground Storage Tanks 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 Pennwyn?
From about Oct 8 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 7 (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 7. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Pennwyn's scale — its 7a band and its 218-day season. Your yard writes its own version of Pennwyn'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 Pennwyn’s own scale
7 of the readings below were taken at Pennwyn's own scale — its own ~218-day season between 28°F freezes, the 340 acres it covers and 1,519 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Pennwyn's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Pennwyn's own 28°F hard-freeze dates, about Apr 3 and Nov 7 and the ~218-day span between themNOAA 1991–2020 Climate Normals
- 1,519 documented contamination sites on the federal record near Pennwyn, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Pennwyn's boundary and the 340 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~218-day seasonGrowable Ground crop-matching engine
- Pennwyn sits in the Northern Piedmont — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Pennwynlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Pennwyn's 340 acres read through its county's SSURGO summaryfrom Berks County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Berks 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 Berks County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Pennwyn's 340 acreswhy one lot differs from the next →
- Which side of Pennwyn you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 340 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Pennwyn-wide figureread your own land →
More in Pennsylvania
Growing region
Nearby growing guides