Mill Shoals, Illinois, 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.
Well-matched crops include cabbage, hazelnut, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Mill Shoals, 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 Mill Shoals 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 Mill Shoals — soil, climate, flood, and parcel records. How we handle your address.
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Mill Shoals — the short answer
Mill Shoals, Illinois: USDA zone 6b, about 219 days between hard freezes, across 491 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~219
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 491 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 6b is Mill Shoals's average, not your lot's — a low corner or a tree line moves it. Against Mill Shoals's 219-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mill Shoals
Each reading below is measured for Mill Shoals itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMill Shoals runs about 219 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
MeasuredMill Shoals 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 Mill Shoals is in
Mill Shoals sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Mill Shoals's own centroid rather than borrowed from White County.
What Grows in Mill Shoals
Every plant below cleared Mill Shoals's own zone 6b and its 219-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Mill Shoals?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 30 (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. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
What's on the federal record near Mill Shoals
Closest first, within ~10 miles of Mill Shoals. Listing isn't leaking, and distance isn't exposure.
- James WitwerUnderground Storage Tanks · 300 ft
- Carter Convenience StoreUnderground Storage Tanks · 400 ft
- Barnhill Mini MartUnderground Storage Tanks · 2400 ft
- FRANK R BUCK & COBrownfields · 0.6 mi
- ILLINOIS DEPT OF AGRICULTUREBrownfields · 3.7 mi
- Springerton PlantUnderground Storage Tanks · 4.7 mi
- Harl's Service StationUnderground Storage Tanks · 4.8 mi
- Chuck Wagon Charlie's Inc.Underground Storage Tanks · 6.1 mi
- Ja Ag Supply-Enfield PlantUnderground Storage Tanks · 6.2 mi
- Sjm ExcavatingUnderground Storage Tanks · 6.2 mi
- Booth Elem SchUnderground Storage Tanks · 6.2 mi
- LEWIS SCRAP METALBrownfields · 6.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Mill Shoals'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 Mill Shoals.
Total Sites
85
within ~10 miles of Mill Shoals
Risk Level
Moderate
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Mill Shoals
Severity Distribution
within ~10 miles of Mill Shoals
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Mill Shoals, Underground Storage Tanks runs higher than the national average — 65 sites within ~10 miles of Mill Shoals. 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 Mill Shoals
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 Mill Shoals average
Your land is one point inside Mill Shoals
Everything above resolves to Mill Shoals as a whole — one PHZM band and one 28°F frost record, read across 491 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 town 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 Mill Shoals Average
Mill Shoals Average
- ●USDA Zones 6b, averaged across Mill Shoals
- ●One soil character for all of Mill Shoals
- ●Frost dates read at Mill Shoals's scale: Mar 30 to Nov 4
YOUR Parcel
- ✓Your exact zone, not Mill Shoals's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mill Shoals
Pull a site-specific report for your exact address in Mill Shoals, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mill Shoals averages can't show:
We read public map data around Mill Shoals — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mill Shoals average
How we know this about Mill Shoals
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Mill Shoals’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 town grain anywhere on this page — there is no town-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 Mill Shoals
When does frost risk typically end in Mill Shoals?
The last hard freeze (28°F) in Mill Shoals typically lands around Mar 30, 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 20.
When is the first frost in Mill Shoals?
The first hard freeze (28°F) in Mill Shoals typically arrives around Nov 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 21, so the watching starts about Oct 5 — about 219 days after the spring freeze cleared.
How long is the growing season in Mill Shoals?
Measured between 28°F hard freezes, Mill Shoals sees about 219 frost-free days — roughly Mar 30 through Nov 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 20 to Oct 21, about 184 days.
Is the soil safe to grow vegetables in Mill Shoals?
The federal record around Mill Shoals shows 85 documented sites, mostly Underground Storage Tanks entries (65), the nearest Underground Storage Tanks record under a tenth of a mile 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.
How do I protect my plants from frost in Mill Shoals?
From about Oct 5 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 4 (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 4. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Mill Shoals's scale — its 6b band and its 219-day season. Your yard writes its own version of Mill Shoals'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 Mill Shoals’s own scale
6 of the readings below were taken at Mill Shoals's own scale — its own ~219-day season between 28°F freezes, the 491 acres it covers and 85 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mill Shoals's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Mill Shoals's own 28°F hard-freeze dates, about Mar 30 and Nov 4 and the ~219-day span between themNOAA 1991–2020 Climate Normals
- 85 documented contamination sites on the federal record near Mill Shoals, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Mill Shoals's boundary and the 491 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~219-day seasonGrowable Ground crop-matching engine
- The ecoregion at Mill Shoals's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mill Shoals's 491 acres read through its county's SSURGO summaryfrom White County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom White County
- The growing challenges every Illinois grower plans around — written at state scale, so they stay on the state guidefrom Illinois
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom White County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mill Shoals's 491 acreswhy one lot differs from the next →
- Which side of Mill Shoals you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 491 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Mill Shoals-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisMill Shoals sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides