Chattanooga, Tennessee, sits in USDA hardiness zones 7a-8b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Growers here do well with tomato, pawpaw, iris, and muscadine grape — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Chattanooga, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Chattanooga lot. 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
7a-8b
Last Hard Freeze (28°F)
Feb 5
Town normal — light frosts run a few weeks later
First Frost (state avg.)
Oct 10 - Nov 5
City Area
91K acres
Hardiness Zone Range
Growing Season (statewide frost window)
Zone maps are averages across Chattanooga. Your yard's slope, trees, and frost pockets shift what actually grows — see your land's exact reading.
Soil varies lot by lot — soil types explained.
What Grows in Chattanooga
Plants matched to Chattanooga's USDA zones 7a-8b — each links to its full growing profile.
Growing Challenges in Tennessee
What an experienced grower plans around here — each one has a move.
Heavy clay soils in the Nashville Basin
Basin clay is fertile once it drains — a raised bed handles that immediately, and yearly compost makes it permanent.
High humidity promotes disease in summer
Morning base-watering, breathing room between plants, and resistant varieties — the humid-summer basics from your extension.
Variable spring weather with late frost risk
Let your local frost normals set the schedule — Tennessee springs reward the growers who wait out the last cold snap.
For cultivar selection, pest pressure, and planting-time guidance specific to Tennessee, the UT Extension is the authoritative local source.
Environmental Intelligence
Understanding what's nearby helps you make informed decisions about where and how to grow.
Sources Checked
within ~10 miles of Chattanooga
Severity Distribution
within ~10 miles of Chattanooga
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Chattanooga, two things run higher than the national average — Toxic Release Inventory (146 sites) and Superfund (28 sites). That's not a problem with your land — it's information about it.
Toxic Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Chattanooga
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
Chattanooga Average
- ●USDA Zones 7a-8b
- ●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 specific parcel in Chattanooga
Pull a site-specific report for your exact address in Chattanooga, Tennessee — 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 Chattanooga, Tennessee
- USDA Hardiness Zones: 7a-8b (USDA PHZM 2023)
- Last Hard Freeze (28°F): Feb 5 (town normal, NOAA 1991–2020 Climate Normals — light frosts can follow for a few weeks)
- First Fall Frost (state avg.): Oct 10 - Nov 5 (NOAA 30-Year Climate Normals)
- Land Area: 91K acres (US Census TIGER 2025)
Zone data: USDA ARS Plant Hardiness Zone Map 2023. Climate data: NOAA NCEI. Boundaries: US Census TIGER/Line 2025.
Frequently Asked Questions
What hardiness zone is Chattanooga, Tennessee?
Chattanooga sits in USDA hardiness zones 7a-8b, 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 Chattanooga?
The last hard freeze (28°F) in Chattanooga typically lands around Feb 5, 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 Chattanooga?
Chattanooga's zones 7a-8b support a wide range — strong performers include Tomato, Pawpaw, Iris, Muscadine Grape, and Tulip Poplar. 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 Chattanooga, really?
Officially, Chattanooga sits in USDA zones 7a-8b (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 Chattanooga?
The federal record around Chattanooga runs heavier than most — 1,546 documented sites — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Chattanooga?
As the season closes around Tennessee's first fall frost near Oct 10 - Nov 5 (NOAA 30-year climate normals (1991–2020)), a few moves buy time: cover tender plants with floating row cover or an old sheet on still, clear nights, water the soil the afternoon before a freeze so it holds warmth overnight, and harvest frost-tender crops like tomatoes, peppers, and basil before the first hard night. Hardy greens and root crops shrug off light frost and often sweeten after it, so leave them in.
Everything on this page is a Chattanooga 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.
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