The Cumberland Plateau spans USDA hardiness zones 7a-7b — a zone band wide enough that plant choice, not possibility, is the interesting question.
The Cumberland Plateau isn't the broad Appalachian average — it's a sandstone tableland riding roughly 1,500 to 2,000 feet above the valleys on either side, and that elevation sets the growing rules here. Across these 14 Kentucky and Tennessee plateau counties (EPA's Southwestern Appalachians ecoregion, the scientific line for the plateau), the hardiness band tightens to 7a-7b and the frost-free season runs close to 210 days — median last frost in early April, first frost in early November, later to warm in spring and quicker to cool in fall than the limestone valleys below. The plateau's other signature is underfoot: acidic, sandy soils weathered from Pennsylvanian sandstone, lean on natural fertility but a genuine fit for blueberries, blackberries, and other acid-loving crops that struggle in the sweet limestone soils of the Bluegrass to the west. Plan for the cooler nights, feed the lean soil, and grow toward what the tableland does well. Reliable performers under these conditions include tomato, iris, pawpaw, and redbud; what your own ground favors still comes down to its soil, sun, and drainage.
Your yard isn't all of the Cumberland Plateau.
The Cumberland Plateau spans USDA zones 7a-7b, 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 Cumberland Plateau — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
The Cumberland Plateau — the short answer
The Cumberland Plateau: USDA zones 7a-7b, 204–244 frost-free days depending where in it you stand, across 2 states.
- USDA zones
- 7a-7b
- USDA PHZM 2023, aggregated over the footprint
- Shortest season here
- 204 days
- NOAA Regional Climate Centers ACIS, 1991-2020 — Jackson County
- Counties
- 14
- 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. The season figure is this region's own record, measured across its 14 member counties, not a state or national average.
Hardiness Zone Range
The Cumberland Plateau is not one growing season
One answer for the Cumberland Plateau averages 14 counties whose growing seasons are 40 days apart — from 204 frost-free days in Jackson County to 244 in Sequatchie 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 14 counties runs 208–220 days, with a median of 212 days — a 40-day span end to end.
Measured across 14 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 Cumberland Plateau
The middle half of the Cumberland Plateau runs 208–220 frost-free days, and 7 of its 14 counties sit outside that — 3 on the short side, 4 on the long. A regional planting date describes the middle well and the ends poorly, which is worth knowing before you follow one.
Under 208 frost-free days
3 counties
- Jackson County · 204 days
- Scott County · 204 days
- McCreary County · 205 days
The end of the region that sets the planting calendar — start seed indoors here and the season stretches to meet the crop.
208–220 frost-free days
7 counties
0 of 7 shown
The middle half of the region, and the part a single regional season describes well.
Over 220 frost-free days
4 counties
- Sequatchie County · 244 days
- Marion County · 237 days
- Bledsoe County · 236 days
3 of 4 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 Cumberland Plateau
All 1 of the plants below that publish a season requirement clear even Jackson County’s 204 frost-free days — so on season alone, this grid works at both ends of the region. The 40-day spread still decides how far past this list you can push, and how early you can start.
Plants matched to the Cumberland Plateau's USDA zones 7a-7b, 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 Cumberland Plateau
Plants the USDA PLANTS Database documents as native and present in all 2 states this region crosses, kept only where the published hardiness range meets the Cumberland Plateau’s USDA zones 7a-7b — 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 Cumberland Plateau
The USDA soil survey maps this ground county by county. These are those records weighted by land area across 14 member counties — this region’s own profile, not a state figure.
The ground is predominantly Ultisols, at 73% of mapped acres, followed by Inceptisols (19%), Alfisols (6%) and Entisols (2%). 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 Lily, Gilpin, and Ramsey.
84% of those acres are well drained, and another 10% somewhat excessively drained, 2% moderately well drained. Topsoil pH runs 4.6–6.4 between the lowest and the highest county on record. 12% of the footprint is classed prime farmland.
Soil order
Ultisols
Drainage
Well drained
Topsoil pH
4.6–6.4
Hydric soils
1%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Marion County holds the most wetland ground here, at 3% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Cumberland Plateau
The soil survey reads this ground county by county, and the readings above are those records summed across the Cumberland Plateau. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records84% of the mapped acres across the Cumberland Plateau are well drained — ground that drains quickly. That is area-weighted across all 14 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 Cumberland Plateau runs pH 4.6–6.4 — acidic in all 14 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 Cumberland Plateau — and how to grow with it.
Across the Cumberland Plateau's 14 counties the federal record holds 1,688 documented sites, mostly Underground Storage Tanks (1,289), Nitrate (176) and Brownfields (91). The heaviest single county is Laurel County, with 278.
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 Cumberland Plateau to see which records sit where you actually grow.
Sources Checked
Summed across the 14 counties in the Cumberland Plateau
A note from Gnorman
What an experienced grower watches for around here
In and around the Cumberland Plateau, two things run higher than the national average across the 14 counties in the Cumberland Plateau — PFAS (35 sites) and Underground Storage Tanks (1,289 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
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 Cumberland Plateau
Everything above resolves to the Cumberland Plateau as a whole — a footprint whose own counties record seasons 40 days apart, and hardiness across zones 7a-7b. 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 Cumberland Plateau Average
Cumberland Plateau Average
- ●USDA Zones 7a-7b, averaged across Cumberland Plateau
- ●One soil character for all of Cumberland Plateau
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Cumberland Plateau's 7a-7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Cumberland Plateau
Pull a site-specific report for your exact address in the Cumberland Plateau — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Cumberland Plateau averages can't show:
We read public map data around The Cumberland Plateau — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cumberland Plateau average
How we know this about the Cumberland Plateau
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 Cumberland Plateau
What hardiness zone is the Cumberland Plateau?
The Cumberland Plateau spans USDA hardiness zones 7a-7b, 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 Cumberland Plateau?
Measured between 28°F hard freezes, the Cumberland Plateau's counties mostly run 208 to 220 frost-free days, median 212 (NOAA Regional Climate Centers ACIS, 1991–2020, over 14 member counties). That 12-day spread is the honest read — no single season describes 14 counties, and each county guide below carries its own.
When does frost risk end in the Cumberland Plateau?
Across the Cumberland Plateau, the middle half of member counties see their last 28°F hard freeze between Mar 29 and Apr 6 (median Apr 4), and their first fall freeze between Oct 30 and Nov 4. Those are hard freezes, not the last light frost: tender transplants wait for about Apr 25, and elevation decides which end of a 8-day spread you garden in.
What grows well in the Cumberland Plateau?
The Cumberland Plateau's conditions suit plants such as Tomato, Iris, Pawpaw, Redbud, Blackberry, Kentucky Bluegrass. 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 Cumberland Plateau defined?
The Cumberland Plateau is defined here as a curated cluster of 14 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 Cumberland Plateau cover?
The Cumberland Plateau spans Kentucky and Tennessee. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Mississippi Delta, Ohio River Valley, Blue Ridge, West Tennessee (Gulf Coastal Plain / Loess Plains), and Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) share at least one state with the Cumberland Plateau. 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 Cumberland Plateau’s own scale
6 of the readings below were taken at the Cumberland Plateau's own scale — the zone 7a-7b band across its footprint, a median 212-day season across its 14 counties and 1,688 documented federal contamination records across its 14 counties, 278 of them in Laurel County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 7a-7b aggregated across all 14 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 14 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 14 counties run 208 to 220 frost-free days, median 212NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 1,688 documented federal contamination records across its 14 counties, 278 of them in Laurel County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 73% Ultisols, topsoil pH 4.6–6.4, area-weighted across its 14 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — all 2 member states' curated sets, merged and filtered to zones 7a-7bfrom Kentucky and Tennessee
What this page can’t tell you
- Which end of the 12-day range your ground sits at — 208 days at one extreme, 220 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 Cumberland Plateau
State growing guides
Counties in this region
Other growing regions across Kentucky and Tennessee
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 flat, deep, dark alluvial bottomland of the lower Mississippi River — extraordinarily fertile cotton, soybean, rice, and sweet-potato ground.
The warm river ribbon threading three states. The Ohio River's moderating flow gives its frontage counties a longer, milder season (zones 6a-7a, ~221 frost-free days) than the colder uplands just inland — a distinct corridor, not the surrounding hill country. It is also historic American wine country: the Ohio River Valley is a federally recognized winegrowing appellation (TTB AVA, 27 CFR §9.78), and its silty bottomland terraces still favor grapes and river-valley vegetables.
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.
West Tennessee is the state's warmest, flattest, longest-season country — the entire Grand Division west of the Tennessee River. Its southwest corner around Memphis is Tennessee's only broad USDA 8a band (Shelby 266, Tipton 262, Lauderdale 257, Haywood 248, Fayette 245 frost-free days), while the upland plain runs a long 7b of 228–241 days, materially longer than Middle Tennessee's Nashville Basin. The growing medium is different too: deep windblown loess and sandy Coastal Plain soils (EPA Mississippi Valley Loess Plains and Southeastern Plains ecoregions), not the limestone basin or the acidic sandstone plateau that define the rest of the state.
South-central Kentucky's Pennyroyal — the Pennyrile — is a Mississippian karst sinkhole plain: a limestone country of sinking creeks and caves where surface water drains straight down instead of pooling. It runs a full USDA zone 7a across all 18 counties with a long 211-238 day frost-free season, distinctly warmer and longer than the cooler Bluegrass to the northeast, and its well-drained cherty limestone soils behave differently from the Bluegrass's rich phosphatic bottomland. This is Kentucky's dark-fired and burley tobacco, corn, soybean, cattle, and hay belt, anchored by the fast-growing Bowling Green and Hopkinsville metros — none of which a flattened statewide page resolves.