Edwards County, in Illinois, sits in USDA hardiness zone 6b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, hazelnut, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Edwards County holds more than one microclimate.
Soils and elevations shift across Edwards 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 Edwards County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Edwards County — the short answer
Edwards County, Illinois: USDA zone 6b, about 223 days between hard freezes, across 142K acres.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 29
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 7
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~223
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 142K 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 Edwards County's average, not your lot's — a low corner or a tree line moves it. Against Edwards County's 223-day season, see what your own ground reads.
Heat in Edwards County
Across a year, Edwards County accumulates about 3,919 growing degree days above 50°F, about 536 more than the middle Illinois county — ahead of 84 of Illinois’s 102 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 Edwards County
Across Edwards County, the ground is predominantly Alfisols, where Bluford, Belknap, and Ava are the most extensive named soil series. The soil is generally somewhat poorly drained with a silt loam surface. Topsoil pH runs about 5.9–6.6, slightly acidic. Rainfall drains through hydrologic group C/D soils.
Soil order
Alfisols
Drainage
Somewhat poorly drained
Prime farmland
33%
Hydric soils
19%
Soil still varies lot by lot — soil types explained.
How the ground varies across Edwards County
The USDA soil survey maps 51% of Edwards County as somewhat poorly drained — but another 49% drains differently: 23% moderately well drained, 17% poorly drained.
Bluford is the most extensive named soil at 15% of mapped acres, then Belknap (14%) and Ava (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 Edwards County
Each reading below is measured for Edwards 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 Edwards County are somewhat poorly drained, in hydrologic group C/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 Edwards County runs about pH 5.9–6.6, 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
Season length
MeasuredEdwards County runs about 223 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
MeasuredEdwards County sits in USDA hardiness zone 6b.
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 Edwards County is in
Edwards County sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. One consistent ecological setting across the whole county.
What Grows in Edwards County
We scored all 1,086 plants against Edwards County's own USDA zone 6b and its own 223-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 Illinois profile.
Is it too late to plant in Edwards County?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 7 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
What gets applied to farmland in Edwards County
USGS estimates 61,098 lb of Metolachlor & Metolachlor-s on Edwards County farmland in 2019, its largest by weight, ahead of Metolachlor-s (46,619 lb) and Glyphosate (41,062 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 Edwards County — and how to grow with it.
We checked the federal record across Edwards County — 68 documented sites across 4 of the 9 source types we track.
The most significant on record: 3 Toxics Release Inventory facilities. Active industrial facilities reporting chemical releases to air, water, and land.
The federal record across Edwards County is a modest one — a typical footprint for a growing area. Nothing here calls for alarm; it's worth knowing which recorded sites sit closest to where you grow, and each one on the map carries its type and location. If one turns out to be a near neighbor, a one-time soil test settles the question.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Edwards County
Closest first, across Edwards County. Listing isn't leaking, and distance isn't exposure.
- Albion Equipment CoUnderground Storage Tanks · 1.5 mi
- McLean ImplementUnderground Storage Tanks · 1.5 mi
- Clayton & Richard Mcdowell Oil CUnderground Storage Tanks · 1.5 mi
- McLean Implement IncUnderground Storage Tanks · 1.5 mi
- Herschel Johnson Implement IncUnderground Storage Tanks · 2.3 mi
- Edwards County Highway DeptUnderground Storage Tanks · 2.3 mi
- Bellessa Auto PlazaUnderground Storage Tanks · 2.7 mi
- The Corner GarageUnderground Storage Tanks · 2.7 mi
- Albion CitgoUnderground Storage Tanks · 2.7 mi
- Albion StationUnderground Storage Tanks · 2.7 mi
- Markman Ashland ServiceUnderground Storage Tanks · 2.7 mi
- Red Hill StationUnderground Storage Tanks · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Edwards 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 Edwards County.
Total Sites
68
across Edwards County
Risk Level
Moderate
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
across Edwards County
Severity Distribution
across Edwards County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Edwards County, Underground Storage Tanks runs higher than the national average — 52 sites across Edwards County. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Edwards 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 Edwards County average
Your land is one point inside Edwards County
Everything above resolves to Edwards County as a whole — one PHZM band and one county frost record, read across 142K 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 Edwards County Average
Edwards County Average
- ●USDA Zones 6b, averaged across Edwards County
- ●One soil character for all of Edwards County
- ●Frost dates read at Edwards County's scale: Mar 29 to Nov 7
YOUR Parcel
- ✓Your exact zone, not Edwards County's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Edwards County
Pull a site-specific report for your exact address in Edwards County, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Edwards County averages can't show:
We read public map data around Edwards County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Edwards County average
How we know this about Edwards 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 Edwards County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Edwards County
When does frost risk typically end in Edwards County?
The last hard freeze (28°F) in Edwards County typically lands around Mar 29, 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 19.
How long is the growing season in Edwards County?
Measured between 28°F hard freezes, Edwards County sees about 223 frost-free days — roughly Mar 29 through Nov 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 19 to Oct 24, about 188 days.
Is the soil safe to grow vegetables in Edwards County?
The federal record around Edwards County shows 68 documented sites, mostly Underground Storage Tanks entries (52), the nearest Underground Storage Tanks record about 1.5 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
Everything above is measured at Edwards County's scale — its 6b band and its 223-day season. Your yard writes its own version of Edwards 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 Illinois's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Edwards County’s own scale
8 of the readings below were taken at Edwards County's own scale — its own ~223-day span between 28°F freezes, the 3 most extensive soil series mapped here and 68 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Edwards County's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Edwards County's own 28°F hard-freeze dates and its ~223-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Edwards CountyUSDA NRCS SSURGO
- 68 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Underground Storage Tanks record about 1.5 miles outFederal environmental registers
- Edwards County's boundary and the 142,336 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~223-day seasonGrowable Ground crop-matching engine
- Edwards County sitting wholly inside the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Which agricultural compounds go onto Edwards County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Illinois grower plans around — written at state scale, so they stay on the state guidefrom Illinois
What this page can’t tell you
- How the season shifts across Edwards County — the ~223 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 Edwards County's 142,336 acreswhy one lot differs from the next →
- Which of those 68 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 Edwards Countyread your own land →