West Conshohocken, Pennsylvania, sits in USDA hardiness zone 7b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
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 West Conshohocken, 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 West Conshohocken 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 West Conshohocken — soil, climate, flood, and parcel records. How we handle your address.
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West Conshohocken — the short answer
West Conshohocken, Pennsylvania: USDA zone 7b, about 232 days between hard freezes, across 540 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~232
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 540 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 West Conshohocken's average, not your lot's — a low corner or a tree line moves it. Against West Conshohocken's 232-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in West Conshohocken
Each reading below is measured for West Conshohocken itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWest Conshohocken runs about 232 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
MeasuredWest Conshohocken 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 West Conshohocken is in
West Conshohocken sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at West Conshohocken's own centroid rather than borrowed from Montgomery County.
What Grows in West Conshohocken
Every plant below cleared West Conshohocken's own zone 7b and its 232-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in West Conshohocken?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 14 — 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 West Conshohocken
Spotted lanternfly documented 2 miles from West Conshohocken, first recorded 2017. What to watch for.
What's on the federal record near West Conshohocken
Closest first, within ~10 miles of West Conshohocken. Listing isn't leaking, and distance isn't exposure.
- CHARLES DE MARCOUnderground Storage Tanks · 350 ft
- PECO ENERGY WEST CONSHOHOCKEN GAS PLTUnderground Storage Tanks · 1300 ft
- DIVERSIFIED DIGITAL & SCREEN PRINT INCBrownfields · 1400 ft
- VALLEY FORGE CONVEYORS INCBrownfields · 1600 ft
- MAZUK INCUnderground Storage Tanks · 1800 ft
- MERION MILLS BUS CTRUnderground Storage Tanks · 1900 ft
- CALVARY CEMETERYUnderground Storage Tanks · 1900 ft
- LUKOIL 69703Underground Storage Tanks · 2500 ft
- HERAEUS PRECIOUS METALS CONSHOHOCKEN LLCToxics Release Inventory · 2600 ft
- HERAEUS PRECIOUS METALS CONSHOHOCKEN LLCBrownfields · 2600 ft
- FERRAIOLIS COASTALUnderground Storage Tanks · 0.5 mi
- PECO ENERGY CO/WEST CONSHOHOCKEN GAS PLTBrownfields · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from West Conshohocken'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 West Conshohocken.
Total Sites
3,334
within ~10 miles of West Conshohocken
Risk Level
High
Highest-severity
31 Superfund sites
Sources Checked
within ~10 miles of West Conshohocken
Severity Distribution
within ~10 miles of West Conshohocken
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 West Conshohocken
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 West Conshohocken average
Your land is one point inside West Conshohocken
Everything above resolves to West Conshohocken as a whole — one PHZM band and one 28°F frost record, read across 540 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 West Conshohocken Average
West Conshohocken Average
- ●USDA Zones 7b, averaged across West Conshohocken
- ●One soil character for all of West Conshohocken
- ●Frost dates read at West Conshohocken's scale: Mar 27 to Nov 14
YOUR Parcel
- ✓Your exact zone, not West Conshohocken's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in West Conshohocken
Pull a site-specific report for your exact address in West Conshohocken, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that West Conshohocken averages can't show:
We read public map data around West Conshohocken — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the West Conshohocken average
How we know this about West Conshohocken
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 West Conshohocken’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 West Conshohocken
When does frost risk typically end in West Conshohocken?
The last hard freeze (28°F) in West Conshohocken typically lands around Mar 27, 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 17.
When is the first frost in West Conshohocken?
The first hard freeze (28°F) in West Conshohocken typically arrives around Nov 14, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 31, so the watching starts about Oct 15 — about 232 days after the spring freeze cleared.
How long is the growing season in West Conshohocken?
Measured between 28°F hard freezes, West Conshohocken sees about 232 frost-free days — roughly Mar 27 through Nov 14, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 17 to Oct 31, about 197 days.
Is the soil safe to grow vegetables in West Conshohocken?
The federal record around West Conshohocken runs heavier than most — 3,334 documented sites, mostly Underground Storage Tanks entries (1,840), 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 West Conshohocken?
From about Oct 15 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 14 (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 14. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at West Conshohocken's scale — its 7b band and its 232-day season. Your yard writes its own version of West Conshohocken'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 West Conshohocken’s own scale
7 of the readings below were taken at West Conshohocken's own scale — its own ~232-day season between 28°F freezes, the 540 acres it covers and 3,334 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- West Conshohocken's own USDA hardiness band, zones 7bUSDA PHZM 2023
- West Conshohocken's own 28°F hard-freeze dates, about Mar 27 and Nov 14 and the ~232-day span between themNOAA 1991–2020 Climate Normals
- 3,334 documented contamination sites on the federal record near West Conshohocken, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- West Conshohocken's boundary and the 540 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~232-day seasonGrowable Ground crop-matching engine
- The ecoregion at West Conshohocken's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of West Conshohockenlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so West Conshohocken's 540 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 West Conshohocken's 540 acreswhy one lot differs from the next →
- Which side of West Conshohocken you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 540 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 West Conshohocken-wide figureread your own land →
More in Pennsylvania
Wider growing context
What grows across PennsylvaniaWest Conshohocken sits outside our named growing regions, so Pennsylvania as a whole is its closest context here.
Nearby growing guides