Rosemont, Pennsylvania, sits in USDA hardiness zone 7b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
The conditions favor cabbage, prickly pear, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Rosemont, 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 Rosemont 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 Rosemont — soil, climate, flood, and parcel records. How we handle your address.
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Rosemont — the short answer
Rosemont, Pennsylvania: USDA zone 7b, about 223 days between hard freezes, across 525 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~223
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 525 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 Rosemont's average, not your lot's — a low corner or a tree line moves it. Against Rosemont's 223-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rosemont
Each reading below is measured for Rosemont itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRosemont runs about 223 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
MeasuredRosemont 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 Rosemont is in
Rosemont sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Rosemont's own centroid rather than borrowed from Montgomery County.
What Grows in Rosemont
Every plant below cleared Rosemont's own zone 7b and its 223-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Rosemont?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 10 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Rosemont
Spotted lanternfly documented 3 miles from Rosemont, first recorded 2018. What to watch for.
What's on the federal record near Rosemont
Closest first, within ~10 miles of Rosemont. Listing isn't leaking, and distance isn't exposure.
- ROSEMONT COLLEGEBrownfields · 1100 ft
- RADNOR HOUSE CONDO ASSNUnderground Storage Tanks · 1400 ft
- ROSEMONT COLLUnderground Storage Tanks · 1500 ft
- ALGAR FERRARI OF PHILADELPHIABrownfields · 1700 ft
- ALGAR ENTERPRISESUnderground Storage Tanks · 1700 ft
- 7 ELEVEN 40474Underground Storage Tanks · 1700 ft
- PLISINSKI BROSUnderground Storage Tanks · 1700 ft
- CVS PHARMACY NO 6902Brownfields · 1800 ft
- SMITHKLINE BEECHAMBrownfields · 1800 ft
- ASSOCIATED PRESSBrownfields · 1800 ft
- BRYN MAWR CTL OFCUnderground Storage Tanks · 2200 ft
- JAMES L & GERALDINE T BARONEUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rosemont'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 Rosemont.
Sources Checked
within ~10 miles of Rosemont
Severity Distribution
within ~10 miles of Rosemont
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 Rosemont
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 Rosemont average
Your land is one point inside Rosemont
Everything above resolves to Rosemont as a whole — one PHZM band and one 28°F frost record, read across 525 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 Rosemont Average
Rosemont Average
- ●USDA Zones 7b, averaged across Rosemont
- ●One soil character for all of Rosemont
- ●Frost dates read at Rosemont's scale: Apr 1 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Rosemont's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rosemont
Pull a site-specific report for your exact address in Rosemont, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rosemont averages can't show:
We read public map data around Rosemont — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rosemont average
How we know this about Rosemont
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 Rosemont’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 Rosemont
When does frost risk typically end in Rosemont?
The last hard freeze (28°F) in Rosemont typically lands around Apr 1, 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 22.
When is the first frost in Rosemont?
The first hard freeze (28°F) in Rosemont typically arrives around Nov 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 27, so the watching starts about Oct 11 — about 223 days after the spring freeze cleared.
How long is the growing season in Rosemont?
Measured between 28°F hard freezes, Rosemont sees about 223 frost-free days — roughly Apr 1 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Oct 27, about 188 days.
Is the soil safe to grow vegetables in Rosemont?
The federal record around Rosemont runs heavier than most — 3,841 documented sites, mostly Underground Storage Tanks entries (2,074), the nearest Brownfields record about 0.2 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 Rosemont?
From about Oct 11 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 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rosemont's scale — its 7b band and its 223-day season. Your yard writes its own version of Rosemont'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 Rosemont’s own scale
7 of the readings below were taken at Rosemont's own scale — its own ~223-day season between 28°F freezes, the 525 acres it covers and 3,841 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rosemont's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Rosemont's own 28°F hard-freeze dates, about Apr 1 and Nov 10 and the ~223-day span between themNOAA 1991–2020 Climate Normals
- 3,841 documented contamination sites on the federal record near Rosemont, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Rosemont's boundary and the 525 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~223-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rosemont's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Rosemontlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rosemont's 525 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 Rosemont's 525 acreswhy one lot differs from the next →
- Which side of Rosemont you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 525 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.2 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 Rosemont-wide figureread your own land →
More in Pennsylvania
Wider growing context
What grows across PennsylvaniaRosemont sits outside our named growing regions, so Pennsylvania as a whole is its closest context here.
Nearby growing guides