The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) spans USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
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. Reliable performers under these conditions include tomato, pawpaw, redbud, and blackberry; what your own ground favors still comes down to its soil, sun, and drainage.
The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) spans Kentucky.
Your yard isn't all of the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau).
The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) spans USDA zones 7a, 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) — soil, climate, flood, and parcel records. How we handle your address.
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The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) — the short answer
The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau): USDA zones 7a, 211–238 frost-free days, in Kentucky.
- USDA zones
- 7a
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 211–238 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 18
- 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
Plants matched to the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)'s USDA zones 7a, 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)’s USDA zones 7a — 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
The USDA soil survey maps this ground county by county. These are those records weighted by land area across 18 member counties — this region’s own profile, not a state figure.
The ground is predominantly Alfisols, at 60% of mapped acres, followed by Ultisols (18%), Inceptisols (18%) and Entisols (4%). Five 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 Zanesville, Baxter, and Crider.
68% of those acres are well drained, and another 19% moderately well drained, 6% somewhat poorly drained. Topsoil pH runs 4.8–6.5 between the lowest and the highest county on record. 28% of the footprint is classed prime farmland.
Soil order
Alfisols
Drainage
Well drained
Topsoil pH
4.8–6.5
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. Hopkins County holds the most wetland ground here, at 16% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
The soil survey reads this ground county by county, and the readings above are those records summed across the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau). Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records68% of the mapped acres across the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) are well drained — ground that drains quickly. That is area-weighted across all 18 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) runs pH 4.8–6.5 — acidic in 17 of its 18 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) — and how to grow with it.
Across the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)'s 18 counties the federal record holds 3,682 documented sites, mostly Underground Storage Tanks (2,529), Nitrate (650) and Toxics Release Inventory (232). The heaviest single county is Warren County, with 547.
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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) to see which records sit where you actually grow.
Sources Checked
Summed across the 18 counties in the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
A note from Gnorman
What an experienced grower watches for around here
In and around the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau), two things run higher than the national average across the 18 counties in the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) — Underground Storage Tanks (2,529 sites) and PFAS (33 sites). That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
Everything above resolves to the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) as a whole — a footprint spanning USDA zones 7a. 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) Average
Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) Average
- ●USDA Zones 7a, averaged across Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
- ●One soil character for all of Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)'s 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
Pull a site-specific report for your exact address in the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) averages can't show:
We read public map data around The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) average
How we know this about the Pennyroyal / Pennyrile (South-Central Kentucky Karst 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
What hardiness zone is the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)?
The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) spans USDA hardiness zones 7a, 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)?
Measured between 28°F hard freezes, the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)'s counties mostly run 220 to 232 frost-free days, median 227 (NOAA Regional Climate Centers ACIS, 1991–2020, over 18 member counties). That 12-day spread is the honest read — no single season describes 18 counties, and each county guide below carries its own.
When does frost risk end in the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)?
Across the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau), the middle half of member counties see their last 28°F hard freeze between Mar 24 and Mar 30 (median Mar 27), and their first fall freeze between Nov 4 and Nov 10. Those are hard freezes, not the last light frost: tender transplants wait for about Apr 17, and elevation decides which end of a 6-day spread you garden in.
What grows well in the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)?
The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)'s conditions suit plants such as Tomato, 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) defined?
The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) is defined here as a curated cluster of 18 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) cover?
The Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau) spans Kentucky. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Ohio River Valley, Kentucky Bluegrass, Cumberland Plateau, and Jackson Purchase (Far Western Kentucky) share at least one state with the Pennyroyal / Pennyrile (South-Central Kentucky Karst 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)’s own scale
6 of the readings below were taken at the Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)'s own scale — the zone 7a band across its footprint, a median 227-day season across its 18 counties and 3,682 documented federal contamination records across its 18 counties, 547 of them in Warren County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 7a aggregated across all 18 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 18 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 18 counties run 220 to 232 frost-free days, median 227NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 3,682 documented federal contamination records across its 18 counties, 547 of them in Warren County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 60% Alfisols, topsoil pH 4.8–6.5, area-weighted across its 18 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 7afrom Kentucky
What this page can’t tell you
- Which end of the 12-day range your ground sits at — 220 days at one extreme, 232 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 Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau)
State growing guides
Counties in this region
Other growing regions across Kentucky
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 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.
Central Kentucky's rolling phosphate-rich limestone soils — famous pasture and tobacco country that also grows excellent vegetables and tree fruit.
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.
The Jackson Purchase is Kentucky's warmest, longest-season corner — a flat block of Mississippi Embayment loess and Gulf Coastal-Plain alluvium west of the Tennessee River, geologically unlike the limestone-and-shale uplands that define the rest of the state. Its eight counties (Paducah to Murray) run PHZM zones 7a–7b with roughly 235–240 frost-free days — about two to three weeks longer than Kentucky's eastern mountains — and its crop identity is a west-Tennessee row-crop belt (soybeans, corn, winter wheat, and the northern fringe of cotton) that neither the statewide Kentucky page nor the Bluegrass/Appalachia regions can tell. Distinct from its nearest captured sibling, ohio-river-valley: that is a thin generic river ribbon, while the Purchase is a coherent warm alluvial flatland with its own soil and season.