Glen Rock, Pennsylvania, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, hazelnut, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Glen Rock, 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 Glen Rock 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 Glen Rock — soil, climate, flood, and parcel records. How we handle your address.
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Glen Rock — the short answer
Glen Rock, Pennsylvania: USDA zone 7a, about 218 days between hard freezes, across 513 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
- 513 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 Glen Rock's average, not your lot's — a low corner or a tree line moves it. Against Glen Rock's 218-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Glen Rock
Each reading below is measured for Glen Rock itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGlen Rock 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
MeasuredGlen Rock 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 Glen Rock is in
Glen Rock sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Glen Rock's own centroid rather than borrowed from York County.
What Grows in Glen Rock
Every plant below cleared Glen Rock'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 Glen Rock?
Usually not — gardeners here simply switch what goes in the ground as the season moves. 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. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around Glen Rock
Spotted lanternfly documented 2 miles from Glen Rock, first recorded 2020. What to watch for.
What's on the federal record near Glen Rock
Closest first, within ~10 miles of Glen Rock. Listing isn't leaking, and distance isn't exposure.
- FRIENDSHIP ELEM SCHUnderground Storage Tanks · 150 ft
- AEP GLEN ROCKUnderground Storage Tanks · 150 ft
- TKS COUNTRY STOREUnderground Storage Tanks · 150 ft
- RLE PROPUnderground Storage Tanks · 200 ft
- FORRYS EXXONUnderground Storage Tanks · 200 ft
- AL PRUEITT & SONS ANTIQUEBrownfields · 400 ft
- PA 0431 50 MAIN STUnderground Storage Tanks · 450 ft
- DUBBS BLDG & REMODELINGUnderground Storage Tanks · 750 ft
- RED STAR MILLWORKBrownfields · 2100 ft
- CAIN & SONS AUTO SOTDORUS MOTORSUnderground Storage Tanks · 0.6 mi
- SEITZLANDUnderground Storage Tanks · 0.7 mi
- SOTDORUS MOTOR COUnderground Storage Tanks · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Glen Rock'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 Glen Rock.
Sources Checked
within ~10 miles of Glen Rock
Severity Distribution
within ~10 miles of Glen Rock
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Glen Rock, PFAS runs higher than the national average — 6 sites within ~10 miles of Glen Rock. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Glen Rock
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 Glen Rock average
Your land is one point inside Glen Rock
Everything above resolves to Glen Rock as a whole — one PHZM band and one 28°F frost record, read across 513 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 Glen Rock Average
Glen Rock Average
- ●USDA Zones 7a, averaged across Glen Rock
- ●One soil character for all of Glen Rock
- ●Frost dates read at Glen Rock's scale: Apr 3 to Nov 7
YOUR Parcel
- ✓Your exact zone, not Glen Rock's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Glen Rock
Pull a site-specific report for your exact address in Glen Rock, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Glen Rock averages can't show:
We read public map data around Glen Rock — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Glen Rock average
How we know this about Glen Rock
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 Glen Rock’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 Glen Rock
When does frost risk typically end in Glen Rock?
The last hard freeze (28°F) in Glen Rock 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 Glen Rock?
The first hard freeze (28°F) in Glen Rock 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 Glen Rock?
Measured between 28°F hard freezes, Glen Rock 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 Glen Rock?
The federal record around Glen Rock runs heavier than most — 495 documented sites, mostly Underground Storage Tanks entries (252), 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 Glen Rock?
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 Glen Rock's scale — its 7a band and its 218-day season. Your yard writes its own version of Glen Rock'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 Glen Rock’s own scale
7 of the readings below were taken at Glen Rock's own scale — its own ~218-day season between 28°F freezes, the 513 acres it covers and 495 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Glen Rock's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Glen Rock's own 28°F hard-freeze dates, about Apr 3 and Nov 7 and the ~218-day span between themNOAA 1991–2020 Climate Normals
- 495 documented contamination sites on the federal record near Glen Rock, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Glen Rock's boundary and the 513 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~218-day seasonGrowable Ground crop-matching engine
- The ecoregion at Glen Rock's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Glen Rocklydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Glen Rock's 513 acres read through its county's SSURGO summaryfrom York County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom York 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 York County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Glen Rock's 513 acreswhy one lot differs from the next →
- Which side of Glen Rock you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 513 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 Glen Rock-wide figureread your own land →
More in Pennsylvania
Wider growing context
What grows across PennsylvaniaGlen Rock sits outside our named growing regions, so Pennsylvania as a whole is its closest context here.
Nearby growing guides