The Piedmont spans USDA hardiness zones 7a-8b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
The rolling foothill belt between the Appalachians and the coastal plain, defined by heavy red clay soils that reward amendment and drainage. (Southern Piedmont; the Northern Piedmont is a separate ecoregion.) On paper, okra, collard greens, tomato, and sweet potato all suit these conditions — on the ground, soil, sun, and drainage make the final call.
The Piedmont spans Alabama, Georgia, North Carolina, South Carolina and Virginia. Its footprint follows the EPA Level III ecoregion boundary; the counties linked below are representative of the region, not an exhaustive list.
Your yard isn't all of the Piedmont.
The Piedmont spans USDA zones 7a-8b, 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 Piedmont — soil, climate, flood, and parcel records. How we handle your address.
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The Piedmont — the short answer
The Piedmont: USDA zones 7a-8b, 205–275 frost-free days depending where in it you stand, across 5 states.
- USDA zones
- 7a-8b
- USDA PHZM 2023, aggregated over the footprint
- Shortest season here
- 205 days
- NOAA Regional Climate Centers ACIS, 1991-2020 — Pittsylvania County
- Counties
- 148
- US Census TIGER/Line 2025
- Region type
- EPA ecoregion
- 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. The season figure is this region's own record, measured across its 148 member counties, not a state or national average.
Hardiness Zone Range
The Piedmont is not one growing season
One answer for the Piedmont averages 148 counties whose growing seasons are 70 days apart — from 205 frost-free days in Pittsylvania County to 275 in Upson County. That is the same region, measured the same way, in the same years. Which end of it your land sits nearer decides what finishes before the first hard freeze.
The middle half of 148 counties runs 232–259 days, with a median of 246 days — a 70-day span end to end.
Measured across 148 member counties, each carrying its own 28°F normal. NOAA Regional Climate Centers ACIS, 1991-2020. A member with no own record is absent from the range rather than counted as zero — nothing here is interpolated to the region. Your own site sits somewhere inside this range; a parcel report resolves where.
Where the line runs inside the Piedmont
The middle half of the Piedmont runs 232–259 frost-free days, and 71 of its 148 counties sit outside that — 35 on the short side, 36 on the long. A regional planting date describes the middle well and the ends poorly, which is worth knowing before you follow one.
Under 232 frost-free days
35 counties
- Pittsylvania County · 205 days
- Fluvanna County · 207 days
- Goochland County · 211 days
3 of 35 shown
The end of the region that sets the planting calendar — start seed indoors here and the season stretches to meet the crop.
232–259 frost-free days
77 counties
0 of 77 shown
The middle half of the region, and the part a single regional season describes well.
Over 259 frost-free days
36 counties
- Upson County · 275 days
- Hart County · 274 days
- Stephens County · 273 days
3 of 36 shown
Long enough for a second succession of a quick crop after the first comes out.
Each county is placed by its OWN 28°F frost-free normal (NOAA Regional Climate Centers ACIS, 1991-2020), the same figure its own guide page publishes. Elevation, slope and cold-air drainage move a site within its county as well — which is the part only your address resolves.
What Grows in the Piedmont
All 3 of the plants below that publish a season requirement clear even Pittsylvania County’s 205 frost-free days — so on season alone, this grid works at both ends of the region. The 70-day spread still decides how far past this list you can push, and how early you can start.
Plants matched to the Piedmont's USDA zones 7a-8b, 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 Piedmont
Plants the USDA PLANTS Database documents as native and present in all 5 states this region crosses, kept only where the published hardiness range meets the Piedmont’s USDA zones 7a-8b — 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 Piedmont
The USDA soil survey maps this ground county by county. These are those records weighted by land area across 147 member counties — this region’s own profile, not a state figure.
The ground is predominantly Ultisols, at 80% of mapped acres, followed by Alfisols (8%), Inceptisols (8%) and Entisols (4%). Six 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 Cecil, Pacolet, and Madison.
81% of those acres are well drained, and another 7% moderately well drained, 5% somewhat poorly drained. Topsoil pH runs 4.5–7.5 between the lowest and the highest county on record. 23% of the footprint is classed prime farmland.
Soil order
Ultisols
Drainage
Well drained
Topsoil pH
4.5–7.5
Hydric soils
2%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Chesterfield County holds the most wetland ground here, at 17% — soil types explained.
USDA NRCS SSURGO via Soil Data Access · 147 of 148 footprint counties carry a summarizable record; the rest are absent from these figures rather than estimated.
What this means for growing in the Piedmont
The soil survey reads this ground county by county, and the readings above are those records summed across the Piedmont. 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 Piedmont are well drained — ground that drains quickly. That is area-weighted across all 147 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 Piedmont runs pH 4.5–7.5 — acidic in 145 of its 147 counties.
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 Piedmont — and how to grow with it.
Across the Piedmont's 148 counties the federal record holds 64,896 documented sites, mostly Underground Storage Tanks (42,093), Brownfields (14,728) and Toxics Release Inventory (4,366). The heaviest single county is Mecklenburg County, with 3,196.
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 Piedmont to see which records sit where you actually grow.
Sources Checked
Summed across the 148 counties in the Piedmont
A note from Gnorman
What an experienced grower watches for around here
In and around the Piedmont, two things run higher than the national average across the 148 counties in the Piedmont — Toxics Release Inventory (4,366 sites) and Underground Storage Tanks (42,093 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the Piedmont
Everything above resolves to the Piedmont as a whole — a footprint whose own counties record seasons 70 days apart, and hardiness across zones 7a-8b. Your parcel sits at one point in that range, not in the middle of it. 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 Piedmont Average
Piedmont Average
- ●USDA Zones 7a-8b, averaged across Piedmont
- ●One soil character for all of Piedmont
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Piedmont's 7a-8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Piedmont
Pull a site-specific report for your exact address in the Piedmont — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Piedmont averages can't show:
We read public map data around The Piedmont — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Piedmont average
How we know this about the Piedmont
The boundary: an EPA Level III ecoregion (an area sharing climate, soils, and vegetation). 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 Piedmont
What hardiness zone is the Piedmont?
The Piedmont spans USDA hardiness zones 7a-8b, 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 Piedmont?
Measured between 28°F hard freezes, the Piedmont's counties mostly run 232 to 259 frost-free days, median 246 (NOAA Regional Climate Centers ACIS, 1991–2020, over 148 member counties). That 27-day spread is the honest read — no single season describes 148 counties, and each county guide below carries its own.
When does frost risk end in the Piedmont?
Across the Piedmont, the middle half of member counties see their last 28°F hard freeze between Mar 10 and Mar 23 (median Mar 16), and their first fall freeze between Nov 10 and Nov 24. Those are hard freezes, not the last light frost: tender transplants wait for about Apr 6, and elevation decides which end of a 13-day spread you garden in.
What grows well in the Piedmont?
The Piedmont's conditions suit plants such as Okra, Collard Greens, Tomato, Sweet Potato, Pecan, Fig. 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 Piedmont defined?
The Piedmont's footprint follows an EPA Level III ecoregion — a boundary drawn where climate, soils, and vegetation actually change rather than where a state line falls. It covers 148 counties, and the counties linked on this page are representative of the region, not an exhaustive list.
Which states does the Piedmont cover?
The Piedmont spans Alabama, Georgia, North Carolina, South Carolina, and Virginia. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Tidewater & Chesapeake, Blue Ridge, Gulf Coast, Black Belt, and Vidalia / South Georgia share at least one state with the Piedmont. 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 Piedmont’s own scale
6 of the readings below were taken at the Piedmont's own scale — the zone 7a-8b band across its footprint, a median 246-day season across its 148 counties and 64,896 documented federal contamination records across its 148 counties, 3,196 of them in Mecklenburg County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 7a-8b aggregated across all 148 counties in the footprintUSDA PHZM 2023
- The boundary itself — the EPA Level III ecoregion its 148 counties sit inside, drawn where climate and soils changeEPA Level III Ecoregions
- 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 148 counties run 232 to 259 frost-free days, median 246NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 64,896 documented federal contamination records across its 148 counties, 3,196 of them in Mecklenburg County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 80% Ultisols, topsoil pH 4.5–7.5, area-weighted across its 147 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — all 5 member states' curated sets, merged and filtered to zones 7a-8bfrom Alabama, Georgia, North Carolina, South Carolina and Virginia
What this page can’t tell you
- Which end of the 27-day range your ground sits at — 232 days at one extreme, 259 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 Piedmont
State growing guides
Representative counties
Other growing regions across Alabama, Georgia, North Carolina, South Carolina, and 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.)
The low, flat, tidal coastal plain around Chesapeake Bay — sandy soils, mild maritime winters, and a long season for vegetables and Southern staples.
The high, cool, forested spine of the southern Appalachians — layered ridges, acidic mountain loams, and a short upland season suited to apples and cold-hardy crops.
The humid, near-frost-free coastal rim of the Gulf of Mexico — long seasons, sandy and alluvial soils, heat, and hurricanes shaping what thrives. (Representative coastal counties, not exhaustive.)
A crescent of dark, calcareous shrink-swell prairie clays over Cretaceous Selma chalk, sweeping from central Alabama into northeast Mississippi — famously fertile cotton, soybean, corn, and pasture ground with a long southern growing season.
The federally designated Vidalia sweet-onion belt of Georgia's coastal plain — USDA zones 8b to 9a and a long frost-free season of roughly 290 days, from a median last frost near February 18 to a first frost around December 4.