Clinton County, in Ohio, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Clinton County holds more than one microclimate.
Soils and elevations shift across Clinton 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 Clinton County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Clinton County — the short answer
Clinton County, Ohio: USDA zone 6b, about 213 days between hard freezes, across 262K acres.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 5
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 4
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~213
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 262K 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 6b is Clinton County's average, not your lot's — a low corner or a tree line moves it. Against Clinton County's 213-day season, see what your own ground reads.
Heat in Clinton County
Across a year, Clinton County accumulates about 3,137 growing degree days above 50°F, about 215 more than the middle Ohio county — ahead of 67 of Ohio’s 88 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 Clinton County
Across Clinton County, the ground is predominantly Alfisols, where Xenia, Miamian, and Treaty are the most extensive named soil series. The soil is generally moderately well drained with a silt loam surface. Topsoil pH runs about 5.9–6.5, slightly acidic. Rainfall drains through hydrologic group C/D soils.
Soil order
Alfisols
Drainage
Moderately well drained
Prime farmland
28%
Hydric soils
31%
Soil still varies lot by lot — soil types explained.
How the ground varies across Clinton County
The USDA soil survey maps 25% of Clinton County as moderately well drained — but another 75% drains differently: 25% somewhat poorly drained, 22% poorly drained.
Xenia is the most extensive named soil at 13% of mapped acres, then Miamian (13%) and Treaty (12%).
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 Clinton County
Each reading below is measured for Clinton 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 Clinton County are moderately well drained, in hydrologic group C/D — roughly the middle of the drainage range.
This is close to the middle most vegetables prefer: it holds enough water to carry a crop between rains without staying waterlogged. The catch is that a wet spring or a low corner can still tip it soggy.
Plant on the site as-is for most crops, but keep the lowest, slowest-draining beds for moisture-tolerant plantings.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Clinton County runs about pH 5.9–6.5, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Wet ground
MeasuredAbout 31% of Clinton County is mapped as hydric — wetland — soil.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Season length
MeasuredClinton County runs about 213 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
The kind of country Clinton County is in
Clinton County sits in the Eastern Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. One consistent ecological setting across the whole county.
What Grows in Clinton County
We scored all 1,086 plants against Clinton County's own USDA zone 6b and its own 213-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 Ohio profile.
Is it too late to plant in Clinton County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 8; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 5 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 4 — 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.
Documented around Clinton County
Survey cells within 31 miles of Clinton County checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 34 miles off. What to watch for.
- monarch butterfly79 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Clinton County
USGS estimates 199,026 lb of Glyphosate on Clinton County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (141,234 lb) and Metolachlor (93,465 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 Clinton County — and how to grow with it.
We checked the federal record across Clinton County — 202 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 Clinton 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 Clinton County
Closest first, across Clinton County. Listing isn't leaking, and distance isn't exposure.
- LAUREL OAKS VOCATIONALBrownfields · 1.1 mi
- PENSKE TRUCK LEASING CO LPBrownfields · 1.1 mi
- ALKERMES INCBrownfields · 1.3 mi
- AZEK BUILDING PRODUCTS RECYCLING PLANTToxics Release Inventory · 1.3 mi
- AIRBORNE MAINTENANCE AND ENGINEERING SERVICESBrownfields · 1.3 mi
- ATSG (ABX AIR INC., AMES)Brownfields · 1.3 mi
- AIRBORNE GLOBAL SOLUTIONSBrownfields · 1.3 mi
- CLINTON COUNTY ENGINEERUnderground Storage Tanks · 1.7 mi
- FLAGWAY #14Underground Storage Tanks · 1.7 mi
- CLINTON BUILDERS SUPPLYUnderground Storage Tanks · 1.8 mi
- SPEEDWAY #9599Underground Storage Tanks · 1.8 mi
- AMAZON AIR KILNBrownfields · 1.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Clinton 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 Clinton County.
Total Sites
202
across Clinton County
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
across Clinton County
Severity Distribution
across Clinton County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Clinton County, two things run higher than the national average across Clinton County — Toxics Release Inventory (24 sites) and PFAS (3 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Clinton 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 Clinton County average
Your land is one point inside Clinton County
Everything above resolves to Clinton County as a whole — one PHZM band and one county frost record, read across 262K 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 Clinton County Average
Clinton County Average
- ●USDA Zones 6b, averaged across Clinton County
- ●One soil character for all of Clinton County
- ●Frost dates read at Clinton County's scale: Apr 5 to Nov 4
YOUR Parcel
- ✓Your exact zone, not Clinton County's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Clinton County
Pull a site-specific report for your exact address in Clinton County, Ohio — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Clinton County averages can't show:
We read public map data around Clinton County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Clinton County average
How we know this about Clinton 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 Clinton County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Clinton County
When does frost risk typically end in Clinton County?
The last hard freeze (28°F) in Clinton County typically lands around Apr 5, 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 26.
How long is the growing season in Clinton County?
Measured between 28°F hard freezes, Clinton County sees about 213 frost-free days — roughly Apr 5 through Nov 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 26 to Oct 21, about 178 days.
Is the soil safe to grow vegetables in Clinton County?
The federal record around Clinton County is a meaningful one — 202 documented sites, mostly Underground Storage Tanks entries (105), the nearest Brownfields record about 1.1 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 Clinton County's scale — its 6b band and its 213-day season. Your yard writes its own version of Clinton 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 Ohio's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Clinton County’s own scale
9 of the readings below were taken at Clinton County's own scale — its own ~213-day span between 28°F freezes, the 3 most extensive soil series mapped here and 202 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Clinton County's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Clinton County's own 28°F hard-freeze dates and its ~213-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Clinton CountyUSDA NRCS SSURGO
- 202 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Brownfields record about 1.1 miles outFederal environmental registers
- Clinton County's boundary and the 261,588 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~213-day seasonGrowable Ground crop-matching engine
- Clinton County sitting wholly inside the Eastern Corn Belt PlainsUS EPA Level III Ecoregions
- Open occurrence records documented in Clinton County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Clinton County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Ohio grower plans around — written at state scale, so they stay on the state guidefrom Ohio
What this page can’t tell you
- How the season shifts across Clinton County — the ~213 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 Clinton County's 261,588 acreswhy one lot differs from the next →
- Which of those 202 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 Clinton Countyread your own land →