Triadelphia, West Virginia, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Growers here do well with cabbage, hazelnut, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Triadelphia, 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 Triadelphia 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 Triadelphia — soil, climate, flood, and parcel records. How we handle your address.
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Triadelphia — the short answer
Triadelphia, West Virginia: USDA zone 6b, about 210 days between hard freezes, across 431 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 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~210
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 431 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 Triadelphia's average, not your lot's — a low corner or a tree line moves it. Against Triadelphia's 210-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Triadelphia
Each reading below is measured for Triadelphia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredTriadelphia runs about 210 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
MeasuredTriadelphia 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 Triadelphia is in
Triadelphia sits in the Western Allegheny Plateau — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Triadelphia's own centroid rather than borrowed from Ohio County.
What Grows in Triadelphia
Every plant below cleared Triadelphia's own zone 6b and its 210-day season. Each card opens that plant's West Virginia profile. How we score.
Is it too late to plant in Triadelphia?
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 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 3 — 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 Triadelphia
Spotted lanternfly documented 4 miles from Triadelphia, first recorded 2023. What to watch for.
What's on the federal record near Triadelphia
Closest first, within ~10 miles of Triadelphia. Listing isn't leaking, and distance isn't exposure.
- TOUCHSTONE RESEARCH LABORATORY LTDBrownfields · 650 ft
- TOUCHSTONE TESTING LABORATORY LLCBrownfields · 2500 ft
- CONSOL INNOVATIONS LLCBrownfields · 2500 ft
- GROVE LAWN & MARINEBrownfields · 0.7 mi
- I-70 SEC I HQ 06711Underground Storage Tanks · 0.8 mi
- TWICE AS NICE AUTO BODY REPAIR LLCBrownfields · 0.8 mi
- MINE SAFETY & HEALTH ADMUnderground Storage Tanks · 0.8 mi
- FORMER SERVICE STATIONUnderground Storage Tanks · 0.8 mi
- HENRY'SUnderground Storage Tanks · 0.8 mi
- KENS AUTO OUTLETUnderground Storage Tanks · 0.8 mi
- GRIFFITH BROS CONTRACTORSUnderground Storage Tanks · 0.8 mi
- DEVAUL'S SUPERMARKET INCUnderground Storage Tanks · 0.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Triadelphia'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 Triadelphia.
Total Sites
578
within ~10 miles of Triadelphia
Risk Level
Elevated
Highest-severity
7 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Triadelphia
Severity Distribution
within ~10 miles of Triadelphia
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Triadelphia, PFAS runs higher than the national average — 5 sites within ~10 miles of Triadelphia. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Triadelphia
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 Triadelphia average
Your land is one point inside Triadelphia
Everything above resolves to Triadelphia as a whole — one PHZM band and one 28°F frost record, read across 431 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 Triadelphia Average
Triadelphia Average
- ●USDA Zones 6b, averaged across Triadelphia
- ●One soil character for all of Triadelphia
- ●Frost dates read at Triadelphia's scale: Apr 7 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Triadelphia's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Triadelphia
Pull a site-specific report for your exact address in Triadelphia, West Virginia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Triadelphia averages can't show:
We read public map data around Triadelphia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Triadelphia average
How we know this about Triadelphia
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 Triadelphia’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 Triadelphia
When does frost risk typically end in Triadelphia?
The last hard freeze (28°F) in Triadelphia 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 Triadelphia?
The first hard freeze (28°F) in Triadelphia 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 210 days after the spring freeze cleared.
How long is the growing season in Triadelphia?
Measured between 28°F hard freezes, Triadelphia sees about 210 frost-free days — roughly Apr 7 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 28 to Oct 20, about 175 days.
Is the soil safe to grow vegetables in Triadelphia?
The federal record around Triadelphia is a meaningful one — 578 documented sites, mostly Underground Storage Tanks entries (320), the nearest Brownfields record about 0.1 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 Triadelphia?
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 Triadelphia's scale — its 6b band and its 210-day season. Your yard writes its own version of Triadelphia'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 Triadelphia’s own scale
7 of the readings below were taken at Triadelphia's own scale — its own ~210-day season between 28°F freezes, the 431 acres it covers and 578 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Triadelphia's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Triadelphia's own 28°F hard-freeze dates, about Apr 7 and Nov 3 and the ~210-day span between themNOAA 1991–2020 Climate Normals
- 578 documented contamination sites on the federal record near Triadelphia, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Triadelphia's boundary and the 431 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~210-day seasonGrowable Ground crop-matching engine
- The ecoregion at Triadelphia's own centroid, the Western Allegheny PlateauUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Triadelphialydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Triadelphia's 431 acres read through its county's SSURGO summaryfrom Ohio County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Ohio County
- The growing challenges every West Virginia grower plans around — written at state scale, so they stay on the state guidefrom West Virginia
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Ohio County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Triadelphia's 431 acreswhy one lot differs from the next →
- Which side of Triadelphia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 431 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 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 Triadelphia-wide figureread your own land →
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