The Allegheny Highlands spans USDA hardiness zones 6a-6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
West Virginia's coldest, highest corner: the Monongahela high country around Canaan Valley, Davis, Snowshoe, and Spruce Knob (4,863 ft, the state's highest point). Frost lingers into early May (last frost near DOY 106-120) and the season runs just ~170-193 days in USDA zone 6a-6b, so the palette here is genuinely short-season and cold-hardy, a world apart from zone 7a Charleston (frost-free by ~DOY 91). A short list that earns its place here — apple, sugar maple, ramp, and pawpaw — with any one site's soil, sun, and drainage making the final cut.
The Allegheny Highlands spans West Virginia.
Your yard isn't all of the Allegheny Highlands.
The Allegheny Highlands spans USDA zones 6a-6b, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 Allegheny Highlands — soil, climate, flood, and parcel records. How we handle your address.
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The Allegheny Highlands — the short answer
The Allegheny Highlands: USDA zones 6a-6b, 170–193 frost-free days, in West Virginia.
- USDA zones
- 6a-6b
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 170–193 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 7
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. Where a region publishes no measured season, no season figure is shown.
Hardiness Zone Range
What Grows in the Allegheny Highlands
Plants matched to the Allegheny Highlands' USDA zones 6a-6b, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of the Allegheny Highlands
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the Allegheny Highlands’s USDA zones 6a-6b — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across the Allegheny Highlands
The USDA soil survey maps this ground county by county. These are those records weighted by land area across seven member counties — this region’s own profile, not a state figure.
The ground is predominantly Inceptisols, at 47% of mapped acres, followed by Ultisols (34%), Alfisols (11%) and Spodosols (5%). Seven soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Berks, Dekalb, and Clifftop.
81% of those acres are well drained, and another 10% moderately well drained, 4% somewhat excessively drained. Topsoil pH runs 4.4–5.6 between the lowest and the highest county on record. 3% of the footprint is classed prime farmland.
Soil order
Inceptisols
Drainage
Well drained
Topsoil pH
4.4–5.6
Hydric soils
3%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Tucker County holds the most wetland ground here, at 14% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Allegheny Highlands
The soil survey reads this ground county by county, and the readings above are those records summed across the Allegheny Highlands. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records81% of the mapped acres across the Allegheny Highlands are well drained — ground that drains quickly. That is area-weighted across all seven of its mapped counties.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across the Allegheny Highlands runs pH 4.4–5.6 — acidic in all seven of them.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Safe to Grow Here?
What the federal record shows across the Allegheny Highlands — and how to grow with it.
Across the Allegheny Highlands' 7 counties the federal record holds 1,644 documented sites, mostly Underground Storage Tanks (781), Nitrate (546) and Brownfields (254). The heaviest single county is Nicholas County, with 499.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to the Allegheny Highlands to see which records sit where you actually grow.
Sources Checked
Summed across the 7 counties in the Allegheny Highlands
A note from Gnorman
What an experienced grower watches for around here
In and around the Allegheny Highlands, Nitrate runs higher than the national average — 546 sites across the 7 counties in the Allegheny Highlands. 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).
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the Allegheny Highlands
Everything above resolves to the Allegheny Highlands as a whole — a footprint spanning USDA zones 6a-6b. Your parcel sits in exactly one of them. 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 region 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 regional average.
Your Lot vs the Allegheny Highlands Average
Allegheny Highlands Average
- ●USDA Zones 6a-6b, averaged across Allegheny Highlands
- ●One soil character for all of Allegheny Highlands
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Allegheny Highlands' 6a-6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Allegheny Highlands
Pull a site-specific report for your exact address in the Allegheny Highlands — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Allegheny Highlands averages can't show:
We read public map data around The Allegheny Highlands — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Allegheny Highlands average
How we know this about the Allegheny Highlands
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about the Allegheny Highlands
What hardiness zone is the Allegheny Highlands?
The Allegheny Highlands spans USDA hardiness zones 6a-6b, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in the Allegheny Highlands?
Measured between 28°F hard freezes, the Allegheny Highlands' counties mostly run 178 to 188 frost-free days, median 178 (NOAA Regional Climate Centers ACIS, 1991–2020, over 7 member counties). That 10-day spread is the honest read — no single season describes 7 counties, and each county guide below carries its own.
When does frost risk end in the Allegheny Highlands?
Across the Allegheny Highlands, the middle half of member counties see their last 28°F hard freeze between Apr 19 and Apr 25 (median Apr 23), and their first fall freeze between Oct 19 and Oct 24. Those are hard freezes, not the last light frost: tender transplants wait for about May 14, and elevation decides which end of a 6-day spread you garden in.
What grows well in the Allegheny Highlands?
The Allegheny Highlands' conditions suit plants such as Apple, Sugar Maple, Ramp, Pawpaw, Ginseng. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is the Allegheny Highlands defined?
The Allegheny Highlands is defined here as a curated cluster of 7 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does the Allegheny Highlands cover?
The Allegheny Highlands spans West Virginia. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Kanawha / Ohio Valley (Metro Valley), and Eastern Panhandle share at least one state with the Allegheny Highlands. Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at the Allegheny Highlands’s own scale
6 of the readings below were taken at the Allegheny Highlands' own scale — the zone 6a-6b band across its footprint, a median 178-day season across its 7 counties and 1,644 documented federal contamination records across its 7 counties, 499 of them in Nicholas County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 6a-6b aggregated across all 7 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 7 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 7 counties run 178 to 188 frost-free days, median 178NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 1,644 documented federal contamination records across its 7 counties, 499 of them in Nicholas County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 47% Inceptisols, topsoil pH 4.4–5.6, area-weighted across its 7 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 6a-6bfrom West Virginia
What this page can’t tell you
- Which end of the 10-day range your ground sits at — 178 days at one extreme, 188 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore the Allegheny Highlands
State growing guides
Counties in this region
Other growing regions across West Virginia
The vast eastern mountain region of steep hollows, thin acidic soils, and short upland seasons — apples, brambles, ramps, and forest crops on hard-won ground. (Union of the core Appalachian ecoregions.)
West Virginia's warmest, longest-season ground: the Ohio and Kanawha river bottoms run a full hardiness zone warmer than the 6b ridges that hem them in — USDA zone 7a with roughly 215–223 frost-free days from Wayne and Cabell up through Kanawha and Putnam (county_data.json). This is the thermal belt where Charleston, Huntington, and Parkersburg sit, and where most of the state's gardeners actually grow. Expect a spring that opens weeks ahead of the highlands and a fall that holds past the first ridge frosts.
West Virginia's warmest, earliest-spring corner. The three-county Eastern Panhandle — Berkeley, Jefferson, and Morgan — sits at USDA zone 7a with a last frost near the first week of April (day-of-year 93-96) and roughly 207 to 213 frost-free days, a full three to four weeks ahead of the Allegheny mountain counties just west, where the last frost slips to late April and zones drop to 6a/6b. These limestone Shenandoah Valley bottomlands are WV's historic apple and peach country, so a grower here plants a Mid-Atlantic orchard-and-warm-season palette the rest of the state can't reach.