Pen Argyl, Pennsylvania, sits in USDA hardiness zone 6b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Crops well matched to these conditions include cabbage, hazelnut, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Pen Argyl, 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 Pen Argyl 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 Pen Argyl — soil, climate, flood, and parcel records. How we handle your address.
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Pen Argyl — the short answer
Pen Argyl, Pennsylvania: USDA zone 6b, about 205 days between hard freezes, across 859 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 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~205
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 859 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 Pen Argyl's average, not your lot's — a low corner or a tree line moves it. Against Pen Argyl's 205-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Pen Argyl
Each reading below is measured for Pen Argyl itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredPen Argyl runs about 205 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
MeasuredPen Argyl 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 Pen Argyl is in
Pen Argyl sits in the Ridge and Valley — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Pen Argyl's own centroid rather than borrowed from Northampton County.
What Grows in Pen Argyl
Every plant below cleared Pen Argyl's own zone 6b and its 205-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Pen Argyl?
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 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 31 — 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 Pen Argyl
Spotted lanternfly documented 3 miles from Pen Argyl, first recorded 2017. What to watch for.
What's on the federal record near Pen Argyl
Closest first, within ~10 miles of Pen Argyl. Listing isn't leaking, and distance isn't exposure.
- ON THE SPOT DRY CLNRBrownfields · 450 ft
- PEN ARGYL BOROUnderground Storage Tanks · 600 ft
- INTERGY INCToxics Release Inventory · 650 ft
- PARKHILL GARAGEUnderground Storage Tanks · 900 ft
- ANTHONY DALLY & SONSUnderground Storage Tanks · 950 ft
- SCOTTYS FASHIONSUnderground Storage Tanks · 1000 ft
- DIETRICH CHEVROLET OLDSMOBILEUnderground Storage Tanks · 1300 ft
- TURKEY HILL 223Underground Storage Tanks · 1500 ft
- A & H SPORTSWEARUnderground Storage Tanks · 1600 ft
- MENSCH TRUCKINGUnderground Storage Tanks · 1600 ft
- HW EXHIBITSUnderground Storage Tanks · 1700 ft
- BJ TOY COUnderground Storage Tanks · 2000 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Pen Argyl'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 Pen Argyl.
Sources Checked
within ~10 miles of Pen Argyl
Severity Distribution
within ~10 miles of Pen Argyl
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Pen Argyl, Toxics Release Inventory runs higher than the national average — 44 sites within ~10 miles of Pen Argyl. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Pen Argyl
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 Pen Argyl average
Your land is one point inside Pen Argyl
Everything above resolves to Pen Argyl as a whole — one PHZM band and one 28°F frost record, read across 859 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 Pen Argyl Average
Pen Argyl Average
- ●USDA Zones 6b, averaged across Pen Argyl
- ●One soil character for all of Pen Argyl
- ●Frost dates read at Pen Argyl's scale: Apr 9 to Oct 31
YOUR Parcel
- ✓Your exact zone, not Pen Argyl's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Pen Argyl
Pull a site-specific report for your exact address in Pen Argyl, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Pen Argyl averages can't show:
We read public map data around Pen Argyl — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Pen Argyl average
How we know this about Pen Argyl
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 Pen Argyl’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 Pen Argyl
When does frost risk typically end in Pen Argyl?
The last hard freeze (28°F) in Pen Argyl 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 Pen Argyl?
The first hard freeze (28°F) in Pen Argyl typically arrives around Oct 31, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 17, so the watching starts about Oct 1 — about 205 days after the spring freeze cleared.
How long is the growing season in Pen Argyl?
Measured between 28°F hard freezes, Pen Argyl sees about 205 frost-free days — roughly Apr 9 through Oct 31, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 30 to Oct 17, about 170 days.
Is the soil safe to grow vegetables in Pen Argyl?
The federal record around Pen Argyl is a meaningful one — 658 documented sites, mostly Underground Storage Tanks entries (384), the nearest Brownfields record under a tenth of a mile 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 Pen Argyl?
From about Oct 1 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 31 (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 31. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Pen Argyl's scale — its 6b band and its 205-day season. Your yard writes its own version of Pen Argyl'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 Pen Argyl’s own scale
7 of the readings below were taken at Pen Argyl's own scale — its own ~205-day season between 28°F freezes, the 859 acres it covers and 658 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Pen Argyl's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Pen Argyl's own 28°F hard-freeze dates, about Apr 9 and Oct 31 and the ~205-day span between themNOAA 1991–2020 Climate Normals
- 658 documented contamination sites on the federal record near Pen Argyl, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Pen Argyl's boundary and the 859 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~205-day seasonGrowable Ground crop-matching engine
- The ecoregion at Pen Argyl's own centroid, the Ridge and ValleyUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Pen Argyllydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Pen Argyl's 859 acres read through its county's SSURGO summaryfrom Northampton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Northampton 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 Northampton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Pen Argyl's 859 acreswhy one lot differs from the next →
- Which side of Pen Argyl you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 859 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Pen Argyl-wide figureread your own land →