Canonsburg, Pennsylvania, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Crops well matched to these conditions include cabbage, hazelnut, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Canonsburg, 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 Canonsburg 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 Canonsburg — soil, climate, flood, and parcel records. How we handle your address.
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Canonsburg — the short answer
Canonsburg, Pennsylvania: USDA zone 6b, about 209 days between hard freezes, across 1K acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~209
- 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 6b is Canonsburg's average, not your lot's — a low corner or a tree line moves it. Against Canonsburg's 209-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Canonsburg
Each reading below is measured for Canonsburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCanonsburg runs about 209 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
MeasuredCanonsburg sits in USDA hardiness zone 6b.
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 Canonsburg is in
Canonsburg sits in the Western Allegheny Plateau — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Canonsburg's own centroid rather than borrowed from Washington County.
What Grows in Canonsburg
Every plant below cleared Canonsburg's own zone 6b and its 209-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Canonsburg?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 10; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 7 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 2 — 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 Canonsburg
Spotted lanternfly documented 3 miles from Canonsburg, first recorded 2021. What to watch for.
What's on the federal record near Canonsburg
Closest first, within ~10 miles of Canonsburg. Listing isn't leaking, and distance isn't exposure.
- PALLARIAUnderground Storage Tanks · 900 ft
- CANONSBURG ARMORYBrownfields · 1500 ft
- CHJA PUMP STAUnderground Storage Tanks · 1600 ft
- MCMURRAY AMOCOUnderground Storage Tanks · 1600 ft
- CROWN POINT ENTERPRISES INCBrownfields · 1700 ft
- CUMMINS MOTOR SALESBrownfields · 1900 ft
- CD CUMMINSUnderground Storage Tanks · 1900 ft
- ZWAAN DRY CLNR/CANONSBURGBrownfields · 2100 ft
- MAZZAS AMOCOBrownfields · 2200 ft
- MAZZA AMOCOUnderground Storage Tanks · 2200 ft
- IMPERATORE FORD BODY SHOPBrownfields · 2300 ft
- CHARTIERS CLEANERSBrownfields · 2400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Canonsburg'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 Canonsburg.
Total Sites
966
within ~10 miles of Canonsburg
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Canonsburg
Severity Distribution
within ~10 miles of Canonsburg
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.
- •TRI facilities report what they release. Check the wind — downwind beds catch more of it.
Check your specific parcel in Canonsburg
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 Canonsburg average
Your land is one point inside Canonsburg
Everything above resolves to Canonsburg 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 Canonsburg Average
Canonsburg Average
- ●USDA Zones 6b, averaged across Canonsburg
- ●One soil character for all of Canonsburg
- ●Frost dates read at Canonsburg's scale: Apr 7 to Nov 2
YOUR Parcel
- ✓Your exact zone, not Canonsburg's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Canonsburg
Pull a site-specific report for your exact address in Canonsburg, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Canonsburg averages can't show:
We read public map data around Canonsburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Canonsburg average
How we know this about Canonsburg
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 Canonsburg’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 Canonsburg
When does frost risk typically end in Canonsburg?
The last hard freeze (28°F) in Canonsburg typically lands around Apr 7, 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 28.
When is the first frost in Canonsburg?
The first hard freeze (28°F) in Canonsburg typically arrives around Nov 2, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 19, so the watching starts about Oct 3 — about 209 days after the spring freeze cleared.
How long is the growing season in Canonsburg?
Measured between 28°F hard freezes, Canonsburg sees about 209 frost-free days — roughly Apr 7 through Nov 2, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 28 to Oct 19, about 174 days.
Is the soil safe to grow vegetables in Canonsburg?
The federal record around Canonsburg is a meaningful one — 966 documented sites, mostly Underground Storage Tanks entries (455), the nearest Underground Storage Tanks record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Canonsburg?
From about Oct 3 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 2 (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 2. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Canonsburg's scale — its 6b band and its 209-day season. Your yard writes its own version of Canonsburg'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 Canonsburg’s own scale
7 of the readings below were taken at Canonsburg's own scale — its own ~209-day season between 28°F freezes, the 1,478 acres it covers and 966 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Canonsburg's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Canonsburg's own 28°F hard-freeze dates, about Apr 7 and Nov 2 and the ~209-day span between themNOAA 1991–2020 Climate Normals
- 966 documented contamination sites on the federal record near Canonsburg, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Canonsburg's boundary and the 1,478 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~209-day seasonGrowable Ground crop-matching engine
- The ecoregion at Canonsburg's own centroid, the Western Allegheny PlateauUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Canonsburglydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Canonsburg's 1,478 acres read through its county's SSURGO summaryfrom Washington County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Washington 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 Washington County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Canonsburg's 1,478 acreswhy one lot differs from the next →
- Which side of Canonsburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,478 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Canonsburg-wide figureread your own land →
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