Willow Springs, Illinois, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
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.
Even in Willow Springs, 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 Willow Springs 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 Willow Springs — soil, climate, flood, and parcel records. How we handle your address.
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Willow Springs — the short answer
Willow Springs, Illinois: USDA zone 6a, about 219 days between hard freezes, across 3K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~219
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K 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 6a is Willow Springs's average, not your lot's — a low corner or a tree line moves it. Against Willow Springs's 219-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Willow Springs
Each reading below is measured for Willow Springs itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWillow Springs 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
MeasuredWillow Springs sits in USDA hardiness zone 6a.
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 Willow Springs is in
Willow Springs sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Willow Springs's own centroid rather than borrowed from Cook County.
What Grows in Willow Springs
Every plant below cleared Willow Springs's own zone 6a and its 219-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Willow Springs?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 8 — 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.
Documented around Willow Springs
Spotted lanternfly documented 8 miles from Willow Springs, first recorded 2023. What to watch for.
What's on the federal record near Willow Springs
Closest first, within ~10 miles of Willow Springs. Listing isn't leaking, and distance isn't exposure.
- SPEEDWAY 1432Brownfields · 1400 ft
- HUNTSMAN CHEMICAL CORPORATIONToxics Release Inventory · 1400 ft
- HUNTSMAN CHEMICAL CORPORATIONBrownfields · 1400 ft
- Ashland Chemical CompanyUnderground Storage Tanks · 1400 ft
- Speedway #1432Underground Storage Tanks · 1600 ft
- HAMMERS AUTO CLINIC INC.Brownfields · 1900 ft
- 7-Eleven #32936Underground Storage Tanks · 2000 ft
- Marathon Concrete Products IncUnderground Storage Tanks · 2600 ft
- VALVOLINE, DIVISION OF ASHLAND INC.Toxics Release Inventory · 0.6 mi
- VALVOLINE, DIVISION OF ASHLAND INC.Brownfields · 0.6 mi
- PROLIFT INCBrownfields · 0.6 mi
- VerizonUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Willow Springs'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 Willow Springs.
Total Sites
3,676
within ~10 miles of Willow Springs
Risk Level
Elevated
Highest-severity
34 Superfund sites
Sources Checked
within ~10 miles of Willow Springs
Severity Distribution
within ~10 miles of Willow Springs
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Willow Springs, two things run higher than the national average within ~10 miles of Willow Springs — PFAS (45 sites) and Toxics Release Inventory (282 sites). That's not a problem with your land — it's information about it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Willow Springs
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 Willow Springs average
Your land is one point inside Willow Springs
Everything above resolves to Willow Springs as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Willow Springs Average
Willow Springs Average
- ●USDA Zones 6a, averaged across Willow Springs
- ●One soil character for all of Willow Springs
- ●Frost dates read at Willow Springs's scale: Apr 3 to Nov 8
YOUR Parcel
- ✓Your exact zone, not Willow Springs's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Willow Springs
Pull a site-specific report for your exact address in Willow Springs, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Willow Springs averages can't show:
We read public map data around Willow Springs — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Willow Springs average
How we know this about Willow Springs
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 Willow Springs’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 Willow Springs
When does frost risk typically end in Willow Springs?
The last hard freeze (28°F) in Willow Springs typically lands around Apr 3, 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 24.
When is the first frost in Willow Springs?
The first hard freeze (28°F) in Willow Springs typically arrives around Nov 8, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 25, so the watching starts about Oct 9 — about 219 days after the spring freeze cleared.
How long is the growing season in Willow Springs?
Measured between 28°F hard freezes, Willow Springs sees about 219 frost-free days — roughly Apr 3 through Nov 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 25, about 184 days.
Is the soil safe to grow vegetables in Willow Springs?
The federal record around Willow Springs is a meaningful one — 3,676 documented sites, mostly Underground Storage Tanks entries (1,857), 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.
How do I protect my plants from frost in Willow Springs?
From about Oct 9 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 8 (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 8. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Willow Springs's scale — its 6a band and its 219-day season. Your yard writes its own version of Willow Springs'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 Willow Springs’s own scale
7 of the readings below were taken at Willow Springs's own scale — its own ~219-day season between 28°F freezes, the 2,655 acres it covers and 3,676 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Willow Springs's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Willow Springs's own 28°F hard-freeze dates, about Apr 3 and Nov 8 and the ~219-day span between themNOAA 1991–2020 Climate Normals
- 3,676 documented contamination sites on the federal record near Willow Springs, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Willow Springs's boundary and the 2,655 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~219-day seasonGrowable Ground crop-matching engine
- The ecoregion at Willow Springs's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Willow Springslydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Willow Springs's 2,655 acres read through its county's SSURGO summaryfrom Cook County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cook 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 Cook County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Willow Springs's 2,655 acreswhy one lot differs from the next →
- Which side of Willow Springs you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,655 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.3 miles 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 Willow Springs-wide figureread your own land →