Dunbar, Pennsylvania, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
A short list that earns its place here — cabbage, blackberry, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Dunbar, 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 Dunbar 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 Dunbar — soil, climate, flood, and parcel records. How we handle your address.
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Dunbar — the short answer
Dunbar, Pennsylvania: USDA zone 6b, about 195 days between hard freezes, across 370 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~195
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 370 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 Dunbar's average, not your lot's — a low corner or a tree line moves it. Against Dunbar's 195-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dunbar
Each reading below is measured for Dunbar itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDunbar runs about 195 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredDunbar 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 Dunbar is in
Dunbar sits in the Western Allegheny Plateau — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Dunbar's own centroid, and it is not what its county reads: Fayette County is mostly Central Appalachians. The wider page above you is answering a different question about different ground.
What Grows in Dunbar
Every plant below cleared Dunbar's own zone 6b and its 195-day season. Each card opens that plant's Pennsylvania profile. How we score.
Is it too late to plant in Dunbar?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 28 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
Documented around Dunbar
Spotted lanternfly documented 2 miles from Dunbar, first recorded 2022. What to watch for.
What's on the federal record near Dunbar
Closest first, within ~10 miles of Dunbar. Listing isn't leaking, and distance isn't exposure.
- SGL 051Underground Storage Tanks · 1200 ft
- TETCO TRACT 172 MP1043 56 LN 1Brownfields · 1400 ft
- CABBOT TRUCKINGUnderground Storage Tanks · 1700 ft
- DUNBAR HONDA MAZDABrownfields · 1900 ft
- ACTION OILBrownfields · 2000 ft
- ACTION OILUnderground Storage Tanks · 2000 ft
- COURTESY OILUnderground Storage Tanks · 0.8 mi
- LOWRY BODY SHOPBrownfields · 0.9 mi
- ICMIBrownfields · 1.0 mi
- THOMAS BELLUnderground Storage Tanks · 1.1 mi
- GAS MART OILUnderground Storage Tanks · 1.1 mi
- BELLS PAINT BODYBrownfields · 1.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dunbar'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 Dunbar.
Total Sites
466
within ~10 miles of Dunbar
Risk Level
Elevated
Highest-severity
14 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Dunbar
Severity Distribution
within ~10 miles of Dunbar
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 Dunbar
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 Dunbar average
Your land is one point inside Dunbar
Everything above resolves to Dunbar as a whole — one PHZM band and one 28°F frost record, read across 370 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 Dunbar Average
Dunbar Average
- ●USDA Zones 6b, averaged across Dunbar
- ●One soil character for all of Dunbar
- ●Frost dates read at Dunbar's scale: Apr 16 to Oct 28
YOUR Parcel
- ✓Your exact zone, not Dunbar's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dunbar
Pull a site-specific report for your exact address in Dunbar, Pennsylvania — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dunbar averages can't show:
We read public map data around Dunbar — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dunbar average
How we know this about Dunbar
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 Dunbar’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 Dunbar
When does frost risk typically end in Dunbar?
The last hard freeze (28°F) in Dunbar typically lands around Apr 16, 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 May 7.
When is the first frost in Dunbar?
The first hard freeze (28°F) in Dunbar typically arrives around Oct 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 14, so the watching starts about Sep 28 — about 195 days after the spring freeze cleared.
How long is the growing season in Dunbar?
Measured between 28°F hard freezes, Dunbar sees about 195 frost-free days — roughly Apr 16 through Oct 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 7 to Oct 14, about 160 days.
Is the soil safe to grow vegetables in Dunbar?
The federal record around Dunbar is a meaningful one — 466 documented sites, mostly Underground Storage Tanks entries (263), 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 Dunbar?
From about Sep 28 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 Oct 28 (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 Oct 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dunbar's scale — its 6b band and its 195-day season. Your yard writes its own version of Dunbar'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 Dunbar’s own scale
7 of the readings below were taken at Dunbar's own scale — its own ~195-day season between 28°F freezes, the 370 acres it covers and 466 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dunbar's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Dunbar's own 28°F hard-freeze dates, about Apr 16 and Oct 28 and the ~195-day span between themNOAA 1991–2020 Climate Normals
- 466 documented contamination sites on the federal record near Dunbar, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Dunbar's boundary and the 370 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~195-day seasonGrowable Ground crop-matching engine
- Dunbar sits in the Western Allegheny Plateau — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Dunbarlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dunbar's 370 acres read through its county's SSURGO summaryfrom Fayette County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Fayette 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 Fayette County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dunbar's 370 acreswhy one lot differs from the next →
- Which side of Dunbar you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 370 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 Dunbar-wide figureread your own land →
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