Humboldt, Tennessee, sits in USDA hardiness zone 7b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, prickly pear, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Humboldt, 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 Humboldt 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 Humboldt — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Humboldt — the short answer
Humboldt, Tennessee: USDA zone 7b, about 235 days between hard freezes, across 7K acres of city.
- 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 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~235
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 7K 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 Humboldt's average, not your lot's — a low corner or a tree line moves it. Against Humboldt's 235-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Humboldt
Each reading below is measured for Humboldt itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHumboldt runs about 235 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
MeasuredHumboldt 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 Humboldt is in
Humboldt sits in the Mississippi Valley Loess Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Humboldt's own centroid rather than borrowed from Gibson County.
What Grows in Humboldt
Every plant below cleared Humboldt's own zone 7b and its 235-day season. Each card opens that plant's Tennessee profile. How we score.
Is it too late to plant in Humboldt?
For most of the year, no — what changes is which crops still fit the days remaining. 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 9 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Humboldt
Closest first, within ~10 miles of Humboldt. Listing isn't leaking, and distance isn't exposure.
- WILSON SPORTING GOODS COMPANYToxics Release Inventory · 450 ft
- Gene Langley FordUnderground Storage Tanks · 1000 ft
- Nucare Convalescence CenterUnderground Storage Tanks · 1600 ft
- Gary Caraway Motor CoUnderground Storage Tanks · 1700 ft
- Kerr Mcgee 6312Underground Storage Tanks · 2100 ft
- Tony Montana Mini MartUnderground Storage Tanks · 2300 ft
- GB:B-001Nitrate · 2400 ft
- Fuel Mart of HumboldtUnderground Storage Tanks · 0.5 mi
- Humbolt AmocoUnderground Storage Tanks · 0.6 mi
- A von HumboldtUnderground Storage Tanks · 0.6 mi
- Country Side MarketUnderground Storage Tanks · 0.6 mi
- Humboldt OasisUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Humboldt'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 Humboldt.
Total Sites
248
within ~10 miles of Humboldt
Risk Level
Elevated
Highest-severity
6 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Humboldt
Severity Distribution
within ~10 miles of Humboldt
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Humboldt, two things run higher than the national average within ~10 miles of Humboldt — Superfund (6 sites) and Toxics Release Inventory (29 sites). That's not a problem with your land — it's information about it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Humboldt
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 Humboldt average
Your land is one point inside Humboldt
Everything above resolves to Humboldt as a whole — one PHZM band and one 28°F frost record, read across 7K 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 city 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 Humboldt Average
Humboldt Average
- ●USDA Zones 7b, averaged across Humboldt
- ●One soil character for all of Humboldt
- ●Frost dates read at Humboldt's scale: Mar 19 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Humboldt's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Humboldt
Pull a site-specific report for your exact address in Humboldt, Tennessee — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Humboldt averages can't show:
We read public map data around Humboldt — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Humboldt average
How we know this about Humboldt
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Humboldt’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 city grain anywhere on this page — there is no city-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 Humboldt
When does frost risk typically end in Humboldt?
The last hard freeze (28°F) in Humboldt 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 Humboldt?
The first hard freeze (28°F) in Humboldt typically arrives around Nov 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 26, so the watching starts about Oct 10 — about 235 days after the spring freeze cleared.
How long is the growing season in Humboldt?
Measured between 28°F hard freezes, Humboldt sees about 235 frost-free days — roughly Mar 19 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 9 to Oct 26, about 200 days.
Is the soil safe to grow vegetables in Humboldt?
The federal record around Humboldt is a meaningful one — 248 documented sites, mostly Underground Storage Tanks entries (146), the nearest Toxics Release Inventory record under a tenth of a mile 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 Humboldt?
From about Oct 10 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Humboldt's scale — its 7b band and its 235-day season. Your yard writes its own version of Humboldt'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 Humboldt’s own scale
6 of the readings below were taken at Humboldt's own scale — its own ~235-day season between 28°F freezes, the 6,641 acres it covers and 248 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Humboldt's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Humboldt's own 28°F hard-freeze dates, about Mar 19 and Nov 9 and the ~235-day span between themNOAA 1991–2020 Climate Normals
- 248 documented contamination sites on the federal record near Humboldt, the closest Toxics Release Inventory record under a tenth of a mile out from the town centreFederal environmental registers
- Humboldt's boundary and the 6,641 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~235-day seasonGrowable Ground crop-matching engine
- The ecoregion at Humboldt's own centroid, the Mississippi Valley Loess PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Humboldt's 6,641 acres read through its county's SSURGO summaryfrom Gibson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Gibson 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 Gibson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Humboldt's 6,641 acreswhy one lot differs from the next →
- Which side of Humboldt you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 6,641 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory record under a tenth of a mile 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 Humboldt-wide figureread your own land →