Howell County, in Missouri, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
These conditions suit cabbage, hazelnut, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Howell County lies within the Ozarks — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Howell County holds more than one microclimate.
Soils and elevations shift across Howell County, so your frost dates and drainage aren't the county average. 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 Howell County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Howell County — the short answer
Howell County, Missouri: USDA zone 7a, about 222 days between hard freezes, across 593K acres.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 26
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 3
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~222
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 593K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 7a is Howell County's average, not your lot's — a low corner or a tree line moves it. Against Howell County's 222-day season, see what your own ground reads.
Heat in Howell County
Across a year, Howell County accumulates about 3,821 growing degree days above 50°F, about 68 more than the middle Missouri county — ahead of 69 of Missouri’s 115 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Howell County
Across Howell County, the ground is predominantly Ultisols, where Scholten, Poynor, and Alred are the most extensive named soil series. The soil is generally well drained with a very gravelly silt loam surface. Topsoil pH runs about 4.9–5.5, strongly acidic. Rainfall drains through hydrologic group B soils.
Soil order
Ultisols
Drainage
Well drained
Prime farmland
30%
Hydric soils
3%
Soil still varies lot by lot — soil types explained.
How the ground varies across Howell County
The USDA soil survey maps 55% of Howell County as well drained — but another 44% drains differently: 33% moderately well drained, 5% somewhat excessively drained.
Scholten is the most extensive named soil at 13% of mapped acres, then Poynor (13%) and Alred (10%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Howell County
Each reading below is measured for Howell County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Howell County are well drained, in hydrologic group B — ground that drains quickly.
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
MeasuredTopsoil across Howell County runs about pH 4.9–5.5, on the acidic side.
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
Season length
MeasuredHowell County runs about 222 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
MeasuredHowell County sits in USDA hardiness zone 7a.
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 Howell County is in
Howell County sits in the Ozark Highlands — EPA Level III, inside the wider Eastern Temperate Forests. One consistent ecological setting across the whole county.
What Grows in Howell County
We scored all 1,086 plants against Howell County's own USDA zone 7a and its own 222-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Missouri profile.
Is it too late to plant in Howell County?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Feb 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 3 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Howell County
Survey cells within 31 miles of Howell County checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 291 miles off. What to watch for.
What gets applied to farmland in Howell County
USGS estimates 48,331 lb of 2,4-d on Howell County farmland in 2019, its largest by weight, ahead of Glyphosate (4,070 lb) and Chlorpyrifos (709 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Howell County — and how to grow with it.
We checked the federal record across Howell County — 211 documented sites across 6 of the 9 source types we track.
The most significant on record: 15 Toxics Release Inventory facilities. Active industrial facilities reporting chemical releases to air, water, and land.
There's a meaningful federal record across Howell 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.
What's on the federal record near Howell County
Closest first, across Howell County. Listing isn't leaking, and distance isn't exposure.
- PACE CONSTRUCTION - DOSS & HARPER QUARRYBrownfields · 1600 ft
- PACE CONSTRUCTION - DOSS & HARPER QUARRYToxics Release Inventory · 1600 ft
- COLONIAL BAKING COMPANYUnderground Storage Tanks · 1.0 mi
- TINDLE MILLS INCUnderground Storage Tanks · 1.4 mi
- ABANDONED GULF OIL STATIONUnderground Storage Tanks · 1.4 mi
- Dowhen & NapierMining · 1.5 mi
- SNAPPY MART #11Underground Storage Tanks · 1.5 mi
- CITY OF WEST PLAINSUnderground Storage Tanks · 1.7 mi
- MAGNESS #50Underground Storage Tanks · 2.0 mi
- BRAD GUFFY CHEV/OLDSUnderground Storage Tanks · 2.1 mi
- WEST PLAINS COCA-COLA BOTTLING COUnderground Storage Tanks · 2.2 mi
- WEST PLAINS MAINT LOTUnderground Storage Tanks · 2.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Howell County'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 Howell County.
Total Sites
211
across Howell County
Risk Level
Elevated
Highest-severity
15 Toxics Release Inventory facilities
Sources Checked
across Howell County
Severity Distribution
across Howell County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Howell County, two things run higher than the national average across Howell County — Mining (18 sites) and Toxics Release Inventory (15 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Howell County
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 Howell County average
Your land is one point inside Howell County
Everything above resolves to Howell County as a whole — one PHZM band and one county frost record, read across 593K 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 county 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 county average.
Your Lot vs the Howell County Average
Howell County Average
- ●USDA Zones 7a, averaged across Howell County
- ●One soil character for all of Howell County
- ●Frost dates read at Howell County's scale: Mar 26 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Howell County's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Howell County
Pull a site-specific report for your exact address in Howell County, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Howell County averages can't show:
We read public map data around Howell County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Howell County average
How we know this about Howell County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Howell County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Howell County
When does frost risk typically end in Howell County?
The last hard freeze (28°F) in Howell County typically lands around Mar 26, 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 16.
How long is the growing season in Howell County?
Measured between 28°F hard freezes, Howell County sees about 222 frost-free days — roughly Mar 26 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 16 to Oct 20, about 187 days.
Is the soil safe to grow vegetables in Howell County?
The federal record around Howell County is a meaningful one — 211 documented sites, mostly Underground Storage Tanks entries (116), the nearest Brownfields record about 0.3 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.
Everything above is measured at Howell County's scale — its 7a band and its 222-day season. Your yard writes its own version of Howell County's numbers: 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 Missouri's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Howell County’s own scale
8 of the readings below were taken at Howell County's own scale — its own ~222-day span between 28°F freezes, the 3 most extensive soil series mapped here and 211 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Howell County's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Howell County's own 28°F hard-freeze dates and its ~222-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Howell CountyUSDA NRCS SSURGO
- 211 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Brownfields record about 0.3 miles outFederal environmental registers
- Howell County's boundary and the 593,393 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~222-day seasonGrowable Ground crop-matching engine
- Howell County sitting wholly inside the Ozark HighlandsUS EPA Level III Ecoregions
- Which agricultural compounds go onto Howell County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Missouri grower plans around — written at state scale, so they stay on the state guidefrom Missouri
What this page can’t tell you
- How the season shifts across Howell County — the ~222 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Howell County's 593,393 acreswhy one lot differs from the next →
- Which of those 211 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Howell Countyread your own land →