Bryn Athyn, Pennsylvania, sits in USDA hardiness zone 7b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with cabbage, prickly pear, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Bryn Athyn, 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 Bryn Athyn 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 Bryn Athyn — soil, climate, flood, and parcel records. How we handle your address.
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Bryn Athyn — the short answer
Bryn Athyn, Pennsylvania: 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 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 18
- 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 Bryn Athyn's average, not your lot's — a low corner or a tree line moves it. Against Bryn Athyn's 237-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Bryn Athyn
Each reading below is measured for Bryn Athyn itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBryn Athyn 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
MeasuredBryn Athyn 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 Bryn Athyn is in
Bryn Athyn sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Bryn Athyn's own centroid rather than borrowed from Montgomery County.
What Grows in Bryn Athyn
Every plant below cleared Bryn Athyn's own zone 7b and its 237-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Bryn Athyn?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 18 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Bryn Athyn
Spotted lanternfly documented 3 miles from Bryn Athyn, first recorded 2018. What to watch for.
What's on the federal record near Bryn Athyn
Closest first, within ~10 miles of Bryn Athyn. Listing isn't leaking, and distance isn't exposure.
- HENRY HOPEUnderground Storage Tanks · 2000 ft
- ACAD OF THE NEW CHURCHBrownfields · 0.7 mi
- VALLEY SVC CTRUnderground Storage Tanks · 0.7 mi
- ACAD OF THE NEW CH HEATING PLTUnderground Storage Tanks · 0.9 mi
- PAULS BA CLNRSBrownfields · 1.0 mi
- BUS GARAGEUnderground Storage Tanks · 1.3 mi
- BETHAYRES RECLAMATION CORPUnderground Storage Tanks · 1.3 mi
- MENARINI SILICON BIOSYSTEMS INCBrownfields · 1.3 mi
- MURRAY AVENUE SCHUnderground Storage Tanks · 1.3 mi
- BETHAYRES CTL OFCUnderground Storage Tanks · 1.3 mi
- PHILMONT CCUnderground Storage Tanks · 1.4 mi
- PIONEER AUTO & BODY MFGBrownfields · 1.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Bryn Athyn'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 Bryn Athyn.
Sources Checked
within ~10 miles of Bryn Athyn
Severity Distribution
within ~10 miles of Bryn Athyn
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Bryn Athyn
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 Bryn Athyn average
Your land is one point inside Bryn Athyn
Everything above resolves to Bryn Athyn 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 Bryn Athyn Average
Bryn Athyn Average
- ●USDA Zones 7b, averaged across Bryn Athyn
- ●One soil character for all of Bryn Athyn
- ●Frost dates read at Bryn Athyn's scale: Mar 26 to Nov 18
YOUR Parcel
- ✓Your exact zone, not Bryn Athyn's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Bryn Athyn
Pull a site-specific report for your exact address in Bryn Athyn, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Bryn Athyn averages can't show:
We read public map data around Bryn Athyn — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Bryn Athyn average
How we know this about Bryn Athyn
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 Bryn Athyn’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 Bryn Athyn
When does frost risk typically end in Bryn Athyn?
The last hard freeze (28°F) in Bryn Athyn typically lands around Mar 26, 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 16.
When is the first frost in Bryn Athyn?
The first hard freeze (28°F) in Bryn Athyn typically arrives around Nov 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 4, so the watching starts about Oct 19 — about 237 days after the spring freeze cleared.
How long is the growing season in Bryn Athyn?
Measured between 28°F hard freezes, Bryn Athyn sees about 237 frost-free days — roughly Mar 26 through Nov 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 16 to Nov 4, about 202 days.
Is the soil safe to grow vegetables in Bryn Athyn?
The federal record around Bryn Athyn runs heavier than most — 3,998 documented sites, mostly Underground Storage Tanks entries (1,923), the nearest Underground Storage Tanks record about 0.4 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 Bryn Athyn?
From about Oct 19 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 18 (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 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Bryn Athyn's scale — its 7b band and its 237-day season. Your yard writes its own version of Bryn Athyn'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 Bryn Athyn’s own scale
7 of the readings below were taken at Bryn Athyn's own scale — its own ~237-day season between 28°F freezes, the 1,236 acres it covers and 3,998 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Bryn Athyn's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Bryn Athyn's own 28°F hard-freeze dates, about Mar 26 and Nov 18 and the ~237-day span between themNOAA 1991–2020 Climate Normals
- 3,998 documented contamination sites on the federal record near Bryn Athyn, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Bryn Athyn's boundary and the 1,236 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 Bryn Athyn's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Bryn Athynlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Bryn Athyn's 1,236 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 Bryn Athyn's 1,236 acreswhy one lot differs from the next →
- Which side of Bryn Athyn you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,236 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Bryn Athyn-wide figureread your own land →
More in Pennsylvania
Wider growing context
What grows across PennsylvaniaBryn Athyn sits outside our named growing regions, so Pennsylvania as a whole is its closest context here.
Nearby growing guides