Seymour, Tennessee, sits in USDA hardiness zone 7b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Expect cabbage, prickly pear, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Seymour, 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 Seymour lot. 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 Seymour — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Seymour — the short answer
Seymour, Tennessee: USDA zone 7b, about 238 days between hard freezes, across 10K acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 12
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~238
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 10K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 7b is Seymour's average, not your lot's — a low corner or a tree line moves it. Against Seymour's 238-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Seymour
Each reading below is measured for Seymour itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSeymour runs about 238 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSeymour sits in USDA hardiness zone 7b.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Seymour is in
Seymour sits in the Ridge and Valley — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Seymour's own centroid, and it is not what its county reads: Sevier County is mostly Blue Ridge. The wider page above you is answering a different question about different ground.
What Grows in Seymour
Every plant below cleared Seymour's own zone 7b and its 238-day season. Each card opens that plant's Tennessee profile. How we score.
Is it too late to plant in Seymour?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 12 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Seymour
Survey cells within 31 miles of Seymour checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 65 miles off. What to watch for.
What's on the federal record near Seymour
Closest first, within ~10 miles of Seymour. Listing isn't leaking, and distance isn't exposure.
- ENVIRONMENTAL REMEDIATION CONSULTANTS, INC.Brownfields · 0.5 mi
- Volunteer Fire Dept. Of SeymoUnderground Storage Tanks · 0.5 mi
- CALIBER COLLISION CENTER, SEYMOUR 2832Brownfields · 0.6 mi
- David NortonUnderground Storage Tanks · 0.8 mi
- KROGER #581-26Brownfields · 0.8 mi
- Kroger Store 581Underground Storage Tanks · 0.8 mi
- EZ Stop Food Mart #10Underground Storage Tanks · 0.8 mi
- Pilot #223Underground Storage Tanks · 0.8 mi
- Weigel's #75Underground Storage Tanks · 0.9 mi
- Fastop #21Underground Storage Tanks · 0.9 mi
- Food City Gas-n-Go no. 644Underground Storage Tanks · 1.0 mi
- White Star MarketUnderground Storage Tanks · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Seymour's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Seymour.
Sources Checked
within ~10 miles of Seymour
Severity Distribution
within ~10 miles of Seymour
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Seymour, two things run higher than the national average within ~10 miles of Seymour — Superfund (10 sites) and PFAS (4 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Seymour
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Seymour average
Your land is one point inside Seymour
Everything above resolves to Seymour as a whole — one PHZM band and one 28°F frost record, read across 10K acres. Your parcel is one point inside that footprint. 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 town 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 local average.
Your Lot vs the Seymour Average
Seymour Average
- ●USDA Zones 7b, averaged across Seymour
- ●One soil character for all of Seymour
- ●Frost dates read at Seymour's scale: Mar 19 to Nov 12
YOUR Parcel
- ✓Your exact zone, not Seymour's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Seymour
Pull a site-specific report for your exact address in Seymour, Tennessee — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Seymour averages can't show:
We read public map data around Seymour — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Seymour average
How we know this about Seymour
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Seymour’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Seymour
When does frost risk typically end in Seymour?
The last hard freeze (28°F) in Seymour typically lands around Mar 19, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Apr 9.
When is the first frost in Seymour?
The first hard freeze (28°F) in Seymour typically arrives around Nov 12, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 29, so the watching starts about Oct 13 — about 238 days after the spring freeze cleared.
How long is the growing season in Seymour?
Measured between 28°F hard freezes, Seymour sees about 238 frost-free days — roughly Mar 19 through Nov 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Oct 29, about 203 days.
Is the soil safe to grow vegetables in Seymour?
The federal record around Seymour is a meaningful one — 298 documented sites, mostly Underground Storage Tanks entries (215), the nearest Brownfields record about 0.5 miles out — 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.
How do I protect my plants from frost in Seymour?
From about Oct 13 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Nov 12 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Nov 12. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Seymour's scale — its 7b band and its 238-day season. Your yard writes its own version of Seymour's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Seymour’s own scale
7 of the readings below were taken at Seymour's own scale — its own ~238-day season between 28°F freezes, the 10,252 acres it covers and 298 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Seymour's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Seymour's own 28°F hard-freeze dates, about Mar 19 and Nov 12 and the ~238-day span between themNOAA 1991–2020 Climate Normals
- 298 documented contamination sites on the federal record near Seymour, the closest Brownfields record about 0.5 miles out from the town centreFederal environmental registers
- Seymour's boundary and the 10,252 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~238-day seasonGrowable Ground crop-matching engine
- Seymour sits in the Ridge and Valley — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- Lanternfly survey cells around Seymour checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Seymour's 10,252 acres read through its county's SSURGO summaryfrom Sevier County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Sevier County
- The growing challenges every Tennessee grower plans around — written at state scale, so they stay on the state guidefrom Tennessee
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Sevier County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Seymour's 10,252 acreswhy one lot differs from the next →
- Which side of Seymour you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,252 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.5 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Seymour-wide figureread your own land →
More in Tennessee
Growing regions
Nearby growing guides