Norristown, Pennsylvania, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
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 Norristown, 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 Norristown 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 Norristown — soil, climate, flood, and parcel records. How we handle your address.
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Norristown — the short answer
Norristown, Pennsylvania: USDA zone 7a, about 227 days between hard freezes, across 2K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~227
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 Norristown's average, not your lot's — a low corner or a tree line moves it. Against Norristown's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Norristown
Each reading below is measured for Norristown itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNorristown runs about 227 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
MeasuredNorristown 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 Norristown is in
Norristown sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Norristown's own centroid rather than borrowed from Montgomery County.
What Grows in Norristown
Every plant below cleared Norristown's own zone 7a and its 227-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Norristown?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — 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 Norristown
Spotted lanternfly documented 3 miles from Norristown, first recorded 2017. What to watch for.
What's on the federal record near Norristown
Closest first, within ~10 miles of Norristown. Listing isn't leaking, and distance isn't exposure.
- MONTGOMERY CO NORRISTOWN LIBRARYUnderground Storage Tanks · 400 ft
- TRINITY UNITED CH OF CHRISTUnderground Storage Tanks · 500 ft
- CATANIA AUTO BODYBrownfields · 750 ft
- JJD URETHANE CO INCUnderground Storage Tanks · 800 ft
- COLEMAN & SCHMIDTBrownfields · 900 ft
- MONTGOMERY HOSPUnderground Storage Tanks · 950 ft
- MATLACK TRANSBrownfields · 1000 ft
- MATLACK INC 019Underground Storage Tanks · 1100 ft
- ATLANTIC 0363 0068Underground Storage Tanks · 1200 ft
- MAACO AUTO PAINTING & BODYWORKSBrownfields · 1300 ft
- CAR VISION BODYBrownfields · 1300 ft
- ART & MARKS AUTOBrownfields · 1500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Norristown'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 Norristown.
Sources Checked
within ~10 miles of Norristown
Severity Distribution
within ~10 miles of Norristown
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 Norristown
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 Norristown average
Your land is one point inside Norristown
Everything above resolves to Norristown as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Norristown Average
Norristown Average
- ●USDA Zones 7a, averaged across Norristown
- ●One soil character for all of Norristown
- ●Frost dates read at Norristown's scale: Mar 29 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Norristown's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Norristown
Pull a site-specific report for your exact address in Norristown, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Norristown averages can't show:
We read public map data around Norristown — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Norristown average
How we know this about Norristown
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 Norristown’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 Norristown
When does frost risk typically end in Norristown?
The last hard freeze (28°F) in Norristown typically lands around Mar 29, 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 19.
When is the first frost in Norristown?
The first hard freeze (28°F) in Norristown typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 227 days after the spring freeze cleared.
How long is the growing season in Norristown?
Measured between 28°F hard freezes, Norristown sees about 227 frost-free days — roughly Mar 29 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 28, about 192 days.
Is the soil safe to grow vegetables in Norristown?
The federal record around Norristown runs heavier than most — 2,828 documented sites, mostly Underground Storage Tanks entries (1,511), 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 Norristown?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Norristown's scale — its 7a band and its 227-day season. Your yard writes its own version of Norristown'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 Norristown’s own scale
7 of the readings below were taken at Norristown's own scale — its own ~227-day season between 28°F freezes, the 2,250 acres it covers and 2,828 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Norristown's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Norristown's own 28°F hard-freeze dates, about Mar 29 and Nov 11 and the ~227-day span between themNOAA 1991–2020 Climate Normals
- 2,828 documented contamination sites on the federal record near Norristown, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Norristown's boundary and the 2,250 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~227-day seasonGrowable Ground crop-matching engine
- The ecoregion at Norristown's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Norristownlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Norristown's 2,250 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 Norristown's 2,250 acreswhy one lot differs from the next →
- Which side of Norristown you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,250 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 Norristown-wide figureread your own land →
More in Pennsylvania
Wider growing context
What grows across PennsylvaniaNorristown sits outside our named growing regions, so Pennsylvania as a whole is its closest context here.
Nearby growing guides