The Jackson Purchase (Far Western Kentucky) spans USDA hardiness zones 7a-7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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. Growers here do well with tomato, pawpaw, redbud, and blackberry — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
The Jackson Purchase (Far Western Kentucky) spans Kentucky.
Your yard isn't all of the Jackson Purchase (Far Western Kentucky).
The Jackson Purchase (Far Western Kentucky) 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 Jackson Purchase (Far Western Kentucky) — soil, climate, flood, and parcel records. How we handle your address.
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The Jackson Purchase (Far Western Kentucky) — the short answer
The Jackson Purchase (Far Western Kentucky): USDA zones 7a-7b, 235–240 frost-free days, in Kentucky.
- USDA zones
- 7a-7b
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 235–240 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 8
- 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 Jackson Purchase (Far Western Kentucky)
Plants matched to the Jackson Purchase (Far Western Kentucky)'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 Jackson Purchase (Far Western Kentucky)
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the Jackson Purchase (Far Western Kentucky)’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 Jackson Purchase (Far Western Kentucky)
The USDA soil survey maps this ground county by county. These are those records weighted by land area across eight member counties — this region’s own profile, not a state figure.
The ground is predominantly Alfisols, at 58% of mapped acres, followed by Inceptisols (24%), Ultisols (13%) and Entisols (3%). 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 Loring, Grenada, and Purchase.
52% of those acres are moderately well drained, and another 17% well drained, 17% somewhat poorly drained. Topsoil pH runs 5.3–6.8 between the lowest and the highest county on record. 33% of the footprint is classed prime farmland.
Soil order
Alfisols
Drainage
Moderately well drained
Topsoil pH
5.3–6.8
Hydric soils
9%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. McCracken County holds the most wetland ground here, at 21% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Jackson Purchase (Far Western Kentucky)
The soil survey reads this ground county by county, and the readings above are those records summed across the Jackson Purchase (Far Western Kentucky). Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records52% of the mapped acres across the Jackson Purchase (Far Western Kentucky) are moderately well drained — roughly the middle of the drainage range. That is area-weighted across all eight of its mapped counties.
This is close to the middle most vegetables prefer: it holds enough water to carry a crop between rains without staying waterlogged. The catch is that a wet spring or a low corner can still tip it soggy.
Plant on the site as-is for most crops, but keep the lowest, slowest-draining beds for moisture-tolerant plantings.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across the Jackson Purchase (Far Western Kentucky) runs pH 5.3–6.8 — acidic in five of its eight 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 Jackson Purchase (Far Western Kentucky) — and how to grow with it.
Across the Jackson Purchase (Far Western Kentucky)'s 8 counties the federal record holds 2,689 documented sites, mostly Nitrate (1,412), Underground Storage Tanks (1,056) and Brownfields (100). The heaviest single county is Marshall County, with 549.
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 Jackson Purchase (Far Western Kentucky) to see which records sit where you actually grow.
Sources Checked
Summed across the 8 counties in the Jackson Purchase (Far Western Kentucky)
A note from Gnorman
What an experienced grower watches for around here
In and around the Jackson Purchase (Far Western Kentucky), Nitrate runs higher than the national average — 1,412 sites across the 8 counties in the Jackson Purchase (Far Western Kentucky). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
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 Jackson Purchase (Far Western Kentucky)
Everything above resolves to the Jackson Purchase (Far Western Kentucky) as a whole — a footprint spanning USDA zones 7a-7b. 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 Jackson Purchase (Far Western Kentucky) Average
Jackson Purchase (Far Western Kentucky) Average
- ●USDA Zones 7a-7b, averaged across Jackson Purchase (Far Western Kentucky)
- ●One soil character for all of Jackson Purchase (Far Western Kentucky)
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Jackson Purchase (Far Western Kentucky)'s 7a-7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Jackson Purchase (Far Western Kentucky)
Pull a site-specific report for your exact address in the Jackson Purchase (Far Western Kentucky) — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Jackson Purchase (Far Western Kentucky) averages can't show:
We read public map data around The Jackson Purchase (Far Western Kentucky) — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Jackson Purchase (Far Western Kentucky) average
How we know this about the Jackson Purchase (Far Western Kentucky)
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 Jackson Purchase (Far Western Kentucky)
What hardiness zone is the Jackson Purchase (Far Western Kentucky)?
The Jackson Purchase (Far Western Kentucky) 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 Jackson Purchase (Far Western Kentucky)?
Measured between 28°F hard freezes, the Jackson Purchase (Far Western Kentucky)'s counties mostly run 236 to 239 frost-free days, median 237 (NOAA Regional Climate Centers ACIS, 1991–2020, over 8 member counties). That 3-day spread is the honest read — no single season describes 8 counties, and each county guide below carries its own.
When does frost risk end in the Jackson Purchase (Far Western Kentucky)?
Across the Jackson Purchase (Far Western Kentucky), the middle half of member counties see their last 28°F hard freeze between Mar 20 and Mar 21 (median Mar 21), and their first fall freeze between Nov 12 and Nov 14. Those are hard freezes, not the last light frost: tender transplants wait for about Apr 11, and elevation decides which end of a 1-day spread you garden in.
What grows well in the Jackson Purchase (Far Western Kentucky)?
The Jackson Purchase (Far Western Kentucky)'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 Jackson Purchase (Far Western Kentucky) defined?
The Jackson Purchase (Far Western Kentucky) is defined here as a curated cluster of 8 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 Jackson Purchase (Far Western Kentucky) cover?
The Jackson Purchase (Far Western Kentucky) 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, Pennyroyal / Pennyrile (South-Central Kentucky Karst Plateau), Kentucky Bluegrass, and Cumberland Plateau share at least one state with the Jackson Purchase (Far Western Kentucky). 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 Jackson Purchase (Far Western Kentucky)’s own scale
6 of the readings below were taken at the Jackson Purchase (Far Western Kentucky)'s own scale — the zone 7a-7b band across its footprint, a median 237-day season across its 8 counties and 2,689 documented federal contamination records across its 8 counties, 549 of them in Marshall County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 7a-7b aggregated across all 8 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 8 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 8 counties run 236 to 239 frost-free days, median 237NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 2,689 documented federal contamination records across its 8 counties, 549 of them in Marshall County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 58% Alfisols, topsoil pH 5.3–6.8, area-weighted across its 8 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 7a-7bfrom Kentucky
What this page can’t tell you
- Which end of the 3-day range your ground sits at — 236 days at one extreme, 239 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 Jackson Purchase (Far Western Kentucky)
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.
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.
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.