Downingtown, Pennsylvania, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Crops well matched to these conditions include cabbage, hazelnut, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Downingtown, 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 Downingtown 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 Downingtown — soil, climate, flood, and parcel records. How we handle your address.
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Downingtown — the short answer
Downingtown, Pennsylvania: USDA zone 7a, about 213 days between hard freezes, across 1K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~213
- 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 7a is Downingtown's average, not your lot's — a low corner or a tree line moves it. Against Downingtown's 213-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Downingtown
Each reading below is measured for Downingtown itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDowningtown runs about 213 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
MeasuredDowningtown 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 Downingtown is in
Downingtown sits in the Northern Piedmont — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Downingtown's own centroid rather than borrowed from Chester County.
What Grows in Downingtown
Every plant below cleared Downingtown's own zone 7a and its 213-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Downingtown?
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 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 3 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Downingtown
Spotted lanternfly documented 3 miles from Downingtown, first recorded 2018. What to watch for.
What's on the federal record near Downingtown
Closest first, within ~10 miles of Downingtown. Listing isn't leaking, and distance isn't exposure.
- BRANDYWINE CHEVROLET OLDSMOBILE SUBARUUnderground Storage Tanks · 450 ft
- JW MAXWELL & SON INCUnderground Storage Tanks · 550 ft
- SUNOCO 0004 7829Underground Storage Tanks · 650 ft
- TURKEY HILL 116Underground Storage Tanks · 750 ft
- DOWNINGTOWN TIRE & SVC INCBrownfields · 750 ft
- DOWNINGTOWN AREA SCH DISTBrownfields · 850 ft
- RUST SPECIALTY CHEMICAL INCToxics Release Inventory · 850 ft
- TOOLEN RESTORATIONBrownfields · 900 ft
- PARDINI JR JOHN DMD MSDBrownfields · 950 ft
- OBRIEN MACHUnderground Storage Tanks · 1000 ft
- TRI TECH AUTO SVC/DOWNINGTOWNBrownfields · 1200 ft
- ALGIER PROPUnderground Storage Tanks · 1400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Downingtown'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 Downingtown.
Sources Checked
within ~10 miles of Downingtown
Severity Distribution
within ~10 miles of Downingtown
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Downingtown, Nitrate runs higher than the national average — 664 sites within ~10 miles of Downingtown. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Downingtown
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 Downingtown average
Your land is one point inside Downingtown
Everything above resolves to Downingtown 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 Downingtown Average
Downingtown Average
- ●USDA Zones 7a, averaged across Downingtown
- ●One soil character for all of Downingtown
- ●Frost dates read at Downingtown's scale: Apr 4 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Downingtown's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Downingtown
Pull a site-specific report for your exact address in Downingtown, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Downingtown averages can't show:
We read public map data around Downingtown — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Downingtown average
How we know this about Downingtown
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 Downingtown’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 Downingtown
When does frost risk typically end in Downingtown?
The last hard freeze (28°F) in Downingtown typically lands around Apr 4, 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 25.
When is the first frost in Downingtown?
The first hard freeze (28°F) in Downingtown typically arrives around Nov 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 20, so the watching starts about Oct 4 — about 213 days after the spring freeze cleared.
How long is the growing season in Downingtown?
Measured between 28°F hard freezes, Downingtown sees about 213 frost-free days — roughly Apr 4 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 20, about 178 days.
Is the soil safe to grow vegetables in Downingtown?
The federal record around Downingtown runs heavier than most — 1,788 documented sites, mostly Nitrate entries (664), 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 Downingtown?
From about Oct 4 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 3 (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 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Downingtown's scale — its 7a band and its 213-day season. Your yard writes its own version of Downingtown'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 Downingtown’s own scale
7 of the readings below were taken at Downingtown's own scale — its own ~213-day season between 28°F freezes, the 1,400 acres it covers and 1,788 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Downingtown's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Downingtown's own 28°F hard-freeze dates, about Apr 4 and Nov 3 and the ~213-day span between themNOAA 1991–2020 Climate Normals
- 1,788 documented contamination sites on the federal record near Downingtown, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Downingtown's boundary and the 1,400 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~213-day seasonGrowable Ground crop-matching engine
- The ecoregion at Downingtown's own centroid, the Northern PiedmontUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Downingtownlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Downingtown's 1,400 acres read through its county's SSURGO summaryfrom Chester County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Chester 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 Chester County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Downingtown's 1,400 acreswhy one lot differs from the next →
- Which side of Downingtown you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,400 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 Downingtown-wide figureread your own land →