DeKalb County, in Alabama, sits in USDA hardiness zone 8a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Among the crops suited to this profile: pecan, muscadine grape, okra, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
DeKalb County lies within Appalachia — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
DeKalb County holds more than one microclimate.
Soils and elevations shift across DeKalb County, so your frost dates and drainage aren't the county average. Enter your address and we'll score 1,112 plants against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Quick Facts
USDA Zones
8a
Last Hard Freeze (28°F)
Feb 6
County normal — light frosts run a few weeks later
First Frost (state avg.)
Oct 25 - Nov 20
County Area
497K acres
Hardiness Zone Range
Growing Season (statewide frost window)
Zone maps are averages across DeKalb County. Your yard's slope, trees, and frost pockets shift what actually grows — see your land's exact reading.
Soil in DeKalb County
Across DeKalb County, the ground is predominantly Ultisols, where Hartsells, Wynnville, and Clarksville are the most extensive named soil series. The soil is generally well drained with a fine sandy loam surface. Topsoil pH runs about 5.0–5.3, strongly acidic. Rainfall drains through hydrologic group C soils.
Soil order
Ultisols
Drainage
Well drained
Prime farmland
24%
Hydric soils
2%
Soil still varies lot by lot — soil types explained.
What Grows in DeKalb County
Plants matched to DeKalb County's USDA zones 8a — each links to its full growing profile.
Growing Challenges in Alabama
What an experienced grower plans around here — each one has a move.
Heavy clay soils in the Piedmont region
Open clay with compost over time — or start above it in a raised bed and let the ground catch up underneath.
High humidity promotes fungal diseases
Airflow is the free fungicide: space generously, water at the base in the morning, and pick resistant varieties from your extension's list.
Fire ants are a persistent garden pest
Season-long baiting beats mound-by-mound whack-a-mole — your extension office publishes the current program that works.
For cultivar selection, pest pressure, and planting-time guidance specific to Alabama, the Alabama Cooperative Extension System is the authoritative local source.
Safe to Grow Here?
What the federal record shows across DeKalb County — and how to grow with it.
We checked the federal record across DeKalb County — 524 documented sites across 6 of the 9 source types we track.
The most significant on record: 19 Toxics Release Inventory facilities. Active industrial facilities reporting chemical releases to air, water, and land.
There's a meaningful federal record across DeKalb County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Environmental Intelligence
Understanding what's nearby helps you make informed decisions about where and how to grow.
Total Sites
524
across DeKalb County
Risk Level
Elevated
Highest-severity
19 Toxics Release Inventory facilities
Sources Checked
across DeKalb County
Severity Distribution
across DeKalb County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around DeKalb County, two things run higher than the national average — CAFO (195 sites) and PFAS (5 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in DeKalb County
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,112 plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Your Specific Parcel Matters
DeKalb County Average
- ●USDA Zones 8a
- ●Generic soil type for the area
- ●State-average frost dates
YOUR Parcel
- ✓Your exact hardiness zone
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in DeKalb County
Pull a site-specific report for your exact address in DeKalb County, Alabama — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Key Growing Facts for DeKalb County, Alabama
- USDA Hardiness Zones: 8a (USDA PHZM 2023)
- Last Hard Freeze (28°F): Feb 6 (county normal, NOAA 1991–2020 Climate Normals — light frosts can follow for a few weeks)
- First Fall Frost (state avg.): Oct 25 - Nov 20 (NOAA 30-Year Climate Normals)
- County Land Area: 497K acres (US Census TIGER 2025)
Zone data: USDA ARS Plant Hardiness Zone Map 2023. Climate data: NOAA NCEI. County boundaries: US Census TIGER/Line 2025.
Frost dates here are the DeKalb County average. Low spots and tree cover move them by days on any one yard — see your exact frost windows.
Frequently Asked Questions
What hardiness zone is DeKalb County, Alabama?
DeKalb County sits in USDA hardiness zone 8a, per the USDA Plant Hardiness Zone Map 2023. Zones reflect average annual extreme minimum temperatures from 1991–2020 weather data.
When does frost risk typically end in DeKalb County?
The last hard freeze (28°F) in DeKalb County typically lands around Feb 6, per NOAA 1991–2020 climate normals — an earlier marker than the light-frost dates many planting charts quote. That marks the hard freeze, not the last light frost — light frosts can still bite for a few more weeks, so tender transplants usually wait another 2–3 weeks.
What vegetables grow in DeKalb County?
DeKalb County's zone 8a supports a wide range — strong performers include Pecan, Muscadine Grape, Okra, Collard Greens, and Fig. What actually takes on any one site comes down to its soil, sun, and drainage, and we score each plant against the real conditions at your address.
Which hardiness zone is DeKalb County, really?
Officially, DeKalb County sits in USDA zone 8a (USDA PHZM 2023) — but a zone is a 30-year average of winter's coldest night across an area, and it can't see any one yard. A south-facing slope, a tree line, or a low frost pocket can shift a single site by half a zone either way, which is why neighboring gardeners often quote different numbers. We read the conditions at your exact address — soil, sun, slope, and frost — and score 1,112 plants against what's actually there.
Is the soil safe to grow vegetables in DeKalb County?
The federal record around DeKalb County is a meaningful one — 524 documented sites — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
Just moved to DeKalb County — what should I know before planting?
Start with three facts. DeKalb County sits in USDA zone 8a, which sets what survives winter; the statewide frost window runs about Feb 28 - Apr 5 to Oct 25 - Nov 20 (NOAA 30-year climate normals); and 524 documented sites sit on the federal record here, so a soil test before food beds is the smart first step. From there, matching plants to your actual soil and sun is the fun part.
Everything on this page is a DeKalb County average. Your yard writes its own version — we read soil, sun, drainage, and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Alabama's frost window, season length, and soil profile against the plant's real requirements.