The Tennessee Valley (North Alabama) spans USDA hardiness zones 7b-8a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Alabama's coolest, shortest-season ground — the fertile Tennessee River limestone valley, where sweeter valley-bottom soils and a mid-to-late-March last frost set it apart from the acidic uplands just to the south and the near-frost-free Gulf Coast. (EPA Interior Plateau ecoregion: a limestone river valley, not Appalachian.) Among the crops suited to this profile: okra, collard greens, pecan, and fig. The site-level story — soil, sun, drainage — decides the rest.
The Tennessee Valley (North Alabama) spans Alabama.
Your yard isn't all of the Tennessee Valley (North Alabama).
The Tennessee Valley (North Alabama) spans USDA zones 7b-8a, 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 Tennessee Valley (North Alabama) — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
The Tennessee Valley (North Alabama) — the short answer
The Tennessee Valley (North Alabama): USDA zones 7b-8a, 235–250 frost-free days, in Alabama.
- USDA zones
- 7b-8a
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 235–250 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 6
- 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 Tennessee Valley (North Alabama)
Plants matched to the Tennessee Valley (North Alabama)'s USDA zones 7b-8a, 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 Tennessee Valley (North Alabama)
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the Tennessee Valley (North Alabama)’s USDA zones 7b-8a — 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 Tennessee Valley (North Alabama)
The USDA soil survey maps this ground county by county. These are those records weighted by land area across six member counties — this region’s own profile, not a state figure.
The ground is predominantly Ultisols, at 68% of mapped acres, followed by Inceptisols (14%), Alfisols (12%) and Mollisols (6%). 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 Decatur, Dickson, and Muskingum (Gorgas).
61% of those acres are well drained, and another 18% moderately well drained, 8% somewhat poorly drained. Topsoil pH runs 4.6–6.5 between the lowest and the highest county on record. 42% of the footprint is classed prime farmland.
Soil order
Ultisols
Drainage
Well drained
Topsoil pH
4.6–6.5
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. Limestone County holds the most wetland ground here, at 14% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Tennessee Valley (North Alabama)
The soil survey reads this ground county by county, and the readings above are those records summed across the Tennessee Valley (North Alabama). Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records61% of the mapped acres across the Tennessee Valley (North Alabama) are well drained — ground that drains quickly. That is area-weighted across all six 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 Tennessee Valley (North Alabama) runs pH 4.6–6.5 — acidic in all six 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 Tennessee Valley (North Alabama) — and how to grow with it.
Across the Tennessee Valley (North Alabama)'s 6 counties the federal record holds 3,663 documented sites, mostly Underground Storage Tanks (2,033), Brownfields (881) and Nitrate (288). The heaviest single county is Madison County, with 1,295.
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 Tennessee Valley (North Alabama) to see which records sit where you actually grow.
Sources Checked
Summed across the 6 counties in the Tennessee Valley (North Alabama)
A note from Gnorman
What an experienced grower watches for around here
In and around the Tennessee Valley (North Alabama), two things run higher than the national average across the 6 counties in the Tennessee Valley (North Alabama) — CAFO (128 sites) and Toxics Release Inventory (253 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the Tennessee Valley (North Alabama)
Everything above resolves to the Tennessee Valley (North Alabama) as a whole — a footprint spanning USDA zones 7b-8a. 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 Tennessee Valley (North Alabama) Average
Tennessee Valley (North Alabama) Average
- ●USDA Zones 7b-8a, averaged across Tennessee Valley (North Alabama)
- ●One soil character for all of Tennessee Valley (North Alabama)
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Tennessee Valley (North Alabama)'s 7b-8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Tennessee Valley (North Alabama)
Pull a site-specific report for your exact address in the Tennessee Valley (North Alabama) — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Tennessee Valley (North Alabama) averages can't show:
We read public map data around The Tennessee Valley (North Alabama) — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Tennessee Valley (North Alabama) average
How we know this about the Tennessee Valley (North Alabama)
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 Tennessee Valley (North Alabama)
What hardiness zone is the Tennessee Valley (North Alabama)?
The Tennessee Valley (North Alabama) spans USDA hardiness zones 7b-8a, 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 Tennessee Valley (North Alabama)?
Measured between 28°F hard freezes, the Tennessee Valley (North Alabama)'s counties mostly run 241 to 248 frost-free days, median 243 (NOAA Regional Climate Centers ACIS, 1991–2020, over 6 member counties). That 7-day spread is the honest read — no single season describes 6 counties, and each county guide below carries its own.
When does frost risk end in the Tennessee Valley (North Alabama)?
Across the Tennessee Valley (North Alabama), the middle half of member counties see their last 28°F hard freeze between Mar 14 and Mar 16 (median Mar 16), and their first fall freeze between Nov 12 and Nov 16. Those are hard freezes, not the last light frost: tender transplants wait for about Apr 6, and elevation decides which end of a 2-day spread you garden in.
What grows well in the Tennessee Valley (North Alabama)?
The Tennessee Valley (North Alabama)'s conditions suit plants such as Okra, Collard Greens, Pecan, Fig, Muscadine Grape. 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 Tennessee Valley (North Alabama) defined?
The Tennessee Valley (North Alabama) is defined here as a curated cluster of 6 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 Tennessee Valley (North Alabama) cover?
The Tennessee Valley (North Alabama) spans Alabama. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Appalachia, Piedmont, Gulf Coast, Black Belt, and Wiregrass Region (Southeast Alabama) share at least one state with the Tennessee Valley (North Alabama). 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 Tennessee Valley (North Alabama)’s own scale
6 of the readings below were taken at the Tennessee Valley (North Alabama)'s own scale — the zone 7b-8a band across its footprint, a median 243-day season across its 6 counties and 3,663 documented federal contamination records across its 6 counties, 1,295 of them in Madison County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 7b-8a aggregated across all 6 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 6 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 6 counties run 241 to 248 frost-free days, median 243NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 3,663 documented federal contamination records across its 6 counties, 1,295 of them in Madison County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 68% Ultisols, topsoil pH 4.6–6.5, area-weighted across its 6 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 7b-8afrom Alabama
What this page can’t tell you
- Which end of the 7-day range your ground sits at — 241 days at one extreme, 248 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 Tennessee Valley (North Alabama)
State growing guides
Counties in this region
Other growing regions across Alabama
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 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.)
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.
Alabama's Wiregrass is deep, sandy, acidic Coastal Plain country — the opposite soil story from the alkaline Black Belt clays to its northwest, and the reason this corner became peanut and cotton land (Dothan bills itself the "Peanut Capital of the World"). Inland from the Gulf Coast band, it still runs one of the longest seasons in the state: 270–296 frost-free days and USDA zone 8b, tipping to 9a at Dothan/Houston County where the season matches the coast. Fast-draining, low-pH sand rewards deep-rooted, heat-loving crops and calls for a different water and amendment strategy than the state's heavy interior soils.