Clay County, in Arkansas, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Growers here do well with cabbage, prickly pear, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Clay County lies within the Mississippi Delta — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Clay County holds more than one microclimate.
Soils and elevations shift across Clay 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 Clay County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Clay County — the short answer
Clay County, Arkansas: USDA zone 7b, about 250 days between hard freezes, across 409K acres.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 14
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 19
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~250
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 409K 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 7b is Clay County's average, not your lot's — a low corner or a tree line moves it. Against Clay County's 250-day season, see what your own ground reads.
Heat and winter chill in Clay County
Across a year, Clay County accumulates about 4,496 growing degree days above 50°F, about 310 fewer than the middle Arkansas county — ahead of 19 of Arkansas’s 75 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.
Winter banks about 2,287 hours below 45°F, 507 more than the Arkansas middle of 1,780. Chill is what tells a fruit tree its dormancy is over, and it is set by climate rather than by anything you can build.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Clay County
Across Clay County, the ground is predominantly Alfisols, where Foley, Amagon, and Kobel are the most extensive named soil series. The soil is generally poorly drained with a silt loam surface. Topsoil pH runs about 5.5–6.0, moderately acidic. Rainfall drains through hydrologic group D soils.
Soil order
Alfisols
Drainage
Poorly drained
Prime farmland
26%
Hydric soils
58%
Soil still varies lot by lot — soil types explained.
How the ground varies across Clay County
The USDA soil survey maps 57% of Clay County as poorly drained — but another 43% drains differently: 14% somewhat poorly drained, 14% well drained.
Foley is the most extensive named soil at 13% of mapped acres, then Amagon (9%) and Kobel (9%).
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 Clay County
Each reading below is measured for Clay 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 Clay County are poorly drained, in hydrologic group D — ground that sheds water slowly.
Beds can stay saturated for days after heavy rain, and the roots of most vegetables, berries, and fruit trees suffocate or rot in soil that never drains.
Raised beds or mounded rows lift roots above the wet zone; choose water-tolerant crops for the lowest spots.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Clay County runs about pH 5.5–6.0, 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
MeasuredClay County runs about 250 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
MeasuredClay County 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 Clay County is in
Clay County spans 2 EPA Level III ecoregions — Mississippi Alluvial Plain (77%) and Mississippi Valley Loess Plains (23%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Clay County
We scored all 1,086 plants against Clay County's own USDA zone 7b and its own 250-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 Arkansas profile.
Is it too late to plant in Clay County?
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 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 19 — 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 Clay County
Survey cells within 31 miles of Clay County checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 208 miles off. What to watch for.
What gets applied to farmland in Clay County
USGS estimates 331,617 lb of Glyphosate on Clay County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (126,857 lb) and Metolachlor-s (95,169 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 Clay County — and how to grow with it.
We checked the federal record across Clay County — 137 documented sites across 6 of the 9 source types we track.
The most significant on record: 1 Superfund site (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Clay 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 Clay County
Closest first, across Clay County. Listing isn't leaking, and distance isn't exposure.
- 20N06E28DDA1Nitrate · 2.2 mi
- CRS @ OLD BOYDSVILLE ELEVATOR AND GRAINBrownfields · 2.3 mi
- WESTERN COUNTY SHOPUnderground Storage Tanks · 4.6 mi
- 21N06E26ABA1Nitrate · 4.8 mi
- BLACKS CONOCOUnderground Storage Tanks · 4.8 mi
- MCDOUGAL #1 STOPUnderground Storage Tanks · 4.8 mi
- ST. FRANCIS SERVICE CENTERUnderground Storage Tanks · 4.9 mi
- CROCKETT STOREUnderground Storage Tanks · 5.0 mi
- 20N05E34DBA1Nitrate · 6.3 mi
- CROCKETT'S QUICK SHOPUnderground Storage Tanks · 6.6 mi
- CORNING WATERWORKSPFAS · 6.9 mi
- 19N05E03BBA1Nitrate · 7.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Clay 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 Clay County.
Total Sites
137
across Clay County
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
across Clay County
Severity Distribution
across Clay County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Clay County, Nitrate runs higher than the national average — 48 sites across Clay County. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Clay 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 Clay County average
Your land is one point inside Clay County
Everything above resolves to Clay County as a whole — one PHZM band and one county frost record, read across 409K 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 Clay County Average
Clay County Average
- ●USDA Zones 7b, averaged across Clay County
- ●One soil character for all of Clay County
- ●Frost dates read at Clay County's scale: Mar 14 to Nov 19
YOUR Parcel
- ✓Your exact zone, not Clay County's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Clay County
Pull a site-specific report for your exact address in Clay County, Arkansas — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Clay County averages can't show:
We read public map data around Clay County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Clay County average
How we know this about Clay 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 Clay County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Clay County
When does frost risk typically end in Clay County?
The last hard freeze (28°F) in Clay County typically lands around Mar 14, 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 4.
How long is the growing season in Clay County?
Measured between 28°F hard freezes, Clay County sees about 250 frost-free days — roughly Mar 14 through Nov 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 4 to Nov 5, about 215 days.
Is the soil safe to grow vegetables in Clay County?
The federal record around Clay County is a meaningful one — 137 documented sites, mostly Underground Storage Tanks entries (72), the nearest Nitrate record about 2.2 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 Clay County's scale — its 7b band and its 250-day season. Your yard writes its own version of Clay 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 Arkansas's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Clay County’s own scale
8 of the readings below were taken at Clay County's own scale — its own ~250-day span between 28°F freezes, the 3 most extensive soil series mapped here and 137 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Clay County's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Clay County's own 28°F hard-freeze dates and its ~250-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Clay CountyUSDA NRCS SSURGO
- 137 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Nitrate record about 2.2 miles outFederal environmental registers
- Clay County's boundary and the 409,103 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~250-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Clay County spans, Mississippi Alluvial Plain the largestUS EPA Level III Ecoregions
- Which agricultural compounds go onto Clay County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Arkansas grower plans around — written at state scale, so they stay on the state guidefrom Arkansas
What this page can’t tell you
- How the season shifts across Clay County — the ~250 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 Clay County's 409,103 acreswhy one lot differs from the next →
- Which of those 137 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 Clay Countyread your own land →