The Nashville Basin spans USDA hardiness zone 7b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
A warm limestone lowland ringed by the higher Highland Rim, the Nashville Basin — the Central Basin of Middle Tennessee — grows on thin, phosphate-rich soils over Ordovician limestone: the pasture-and-hay ground that made Shelbyville and Lewisburg the home of the Tennessee Walking Horse. The basin floor holds a steady USDA zone 7b across Davidson, Rutherford, Williamson and the counties around Murfreesboro, with roughly 213-236 frost-free days — a warmer, more southerly growing band than Kentucky's Bluegrass to the north and a longer, milder season than the Cumberland Plateau ridges to the east. Expect tomato, iris, pawpaw, and muscadine grape to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
The Nashville Basin spans Tennessee.
Your yard isn't all of the Nashville Basin.
The Nashville Basin spans USDA zones 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 Nashville Basin — soil, climate, flood, and parcel records. How we handle your address.
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The Nashville Basin — the short answer
The Nashville Basin: USDA zones 7b, 213–236 frost-free days, in Tennessee.
- USDA zones
- 7b
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 213–236 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 10
- 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 Nashville Basin
Plants matched to the Nashville Basin's USDA zones 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 Nashville Basin
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the Nashville Basin’s USDA zones 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 Nashville Basin
The USDA soil survey maps this ground county by county. These are those records weighted by land area across ten member counties — this region’s own profile, not a state figure.
The ground is predominantly Alfisols, at 54% of mapped acres, followed by Mollisols (20%), Ultisols (16%) and Inceptisols (10%). 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 Talbott, Mimosa, and Bodine.
74% of those acres are well drained, and another 9% somewhat excessively drained, 8% moderately well drained. Topsoil pH runs 5.3–6.7 between the lowest and the highest county on record. 24% of the footprint is classed prime farmland.
Soil order
Alfisols
Drainage
Well drained
Topsoil pH
5.3–6.7
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. Rutherford County holds the most wetland ground here, at 6% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Nashville Basin
The soil survey reads this ground county by county, and the readings above are those records summed across the Nashville Basin. Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records74% of the mapped acres across the Nashville Basin are well drained — ground that drains quickly. That is area-weighted across all ten 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 Nashville Basin runs pH 5.3–6.7 — acidic in nine of its ten 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 Nashville Basin — and how to grow with it.
Across the Nashville Basin's 10 counties the federal record holds 5,197 documented sites, mostly Underground Storage Tanks (3,367), Brownfields (1,095) and Toxics Release Inventory (402). The heaviest single county is Davidson County, with 2,216.
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 Nashville Basin to see which records sit where you actually grow.
Sources Checked
Summed across the 10 counties in the Nashville Basin
A note from Gnorman
What an experienced grower watches for around here
In and around the Nashville Basin, two things run higher than the national average across the 10 counties in the Nashville Basin — Toxics Release Inventory (402 sites) and Underground Storage Tanks (3,367 sites). That's not a problem with your land — it's information about it.
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 Nashville Basin
Everything above resolves to the Nashville Basin as a whole — a footprint spanning USDA zones 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 Nashville Basin Average
Nashville Basin Average
- ●USDA Zones 7b, averaged across Nashville Basin
- ●One soil character for all of Nashville Basin
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Nashville Basin's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Nashville Basin
Pull a site-specific report for your exact address in the Nashville Basin — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Nashville Basin averages can't show:
We read public map data around The Nashville Basin — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Nashville Basin average
How we know this about the Nashville Basin
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 Nashville Basin
What hardiness zone is the Nashville Basin?
The Nashville Basin spans USDA hardiness zones 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 Nashville Basin?
Measured between 28°F hard freezes, the Nashville Basin's counties mostly run 225 to 229 frost-free days, median 226 (NOAA Regional Climate Centers ACIS, 1991–2020, over 10 member counties). That 4-day spread is the honest read — no single season describes 10 counties, and each county guide below carries its own.
When does frost risk end in the Nashville Basin?
Across the Nashville Basin, the middle half of member counties see their last 28°F hard freeze between Mar 25 and Mar 27 (median Mar 26), and their first fall freeze between Nov 5 and Nov 10. Those are hard freezes, not the last light frost: tender transplants wait for about Apr 16, and elevation decides which end of a 2-day spread you garden in.
What grows well in the Nashville Basin?
The Nashville Basin's conditions suit plants such as Tomato, Iris, Pawpaw, Muscadine Grape, Tulip Poplar. 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 Nashville Basin defined?
The Nashville Basin is defined here as a curated cluster of 10 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 Nashville Basin cover?
The Nashville Basin spans Tennessee. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Mississippi Delta, Blue Ridge, West Tennessee (Gulf Coastal Plain / Loess Plains), and Cumberland Plateau share at least one state with the Nashville Basin. 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 Nashville Basin’s own scale
6 of the readings below were taken at the Nashville Basin's own scale — the zone 7b band across its footprint, a median 226-day season across its 10 counties and 5,197 documented federal contamination records across its 10 counties, 2,216 of them in Davidson County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 7b aggregated across all 10 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 10 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 10 counties run 225 to 229 frost-free days, median 226NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 5,197 documented federal contamination records across its 10 counties, 2,216 of them in Davidson County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 54% Alfisols, topsoil pH 5.3–6.7, area-weighted across its 10 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 7bfrom Tennessee
What this page can’t tell you
- Which end of the 4-day range your ground sits at — 225 days at one extreme, 229 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 Nashville Basin
State growing guides
Counties in this region
Other growing regions across 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 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.
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.