Hinckley, Illinois, sits in USDA hardiness zone 5b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Among the crops suited to this profile: cabbage, cranberry, lavender, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Hinckley, 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 Hinckley 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 Hinckley — soil, climate, flood, and parcel records. How we handle your address.
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Hinckley — the short answer
Hinckley, Illinois: USDA zone 5b, about 194 days between hard freezes, across 549 acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 12
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~194
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 549 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 5b is Hinckley's average, not your lot's — a low corner or a tree line moves it. Against Hinckley's 194-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hinckley
Each reading below is measured for Hinckley itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHinckley runs about 194 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredHinckley sits in USDA hardiness zone 5b.
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 Hinckley is in
Hinckley sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Hinckley's own centroid rather than borrowed from DeKalb County.
What Grows in Hinckley
Every plant below cleared Hinckley's own zone 5b and its 194-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Hinckley?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 12 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 23 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
Documented around Hinckley
Spotted lanternfly documented 17 miles from Hinckley, first recorded 2023. What to watch for.
What's on the federal record near Hinckley
Closest first, within ~10 miles of Hinckley. Listing isn't leaking, and distance isn't exposure.
- Faxon CoUnderground Storage Tanks · 700 ft
- Kaus HowardUnderground Storage Tanks · 700 ft
- IDOT R.O.W.Underground Storage Tanks · 850 ft
- Voss Motor Sales IncUnderground Storage Tanks · 850 ft
- L&R TRIKESBrownfields · 1000 ft
- RICHS TIRE SERVICE INCBrownfields · 1100 ft
- Jack AmocoUnderground Storage Tanks · 1100 ft
- QRS INCBrownfields · 1300 ft
- R and L Phillips GarageUnderground Storage Tanks · 2200 ft
- BIG ROCK AUTO REBUILDERSBrownfields · 2200 ft
- Jacks AmocoUnderground Storage Tanks · 2200 ft
- Hinckley Big Rock Cusd 429Underground Storage Tanks · 2500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Hinckley'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 Hinckley.
Total Sites
207
within ~10 miles of Hinckley
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Hinckley
Severity Distribution
within ~10 miles of Hinckley
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hinckley, two things run higher than the national average within ~10 miles of Hinckley — PFAS (4 sites) and CAFO (4 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Hinckley
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 Hinckley average
Your land is one point inside Hinckley
Everything above resolves to Hinckley as a whole — one PHZM band and one 28°F frost record, read across 549 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 Hinckley Average
Hinckley Average
- ●USDA Zones 5b, averaged across Hinckley
- ●One soil character for all of Hinckley
- ●Frost dates read at Hinckley's scale: Apr 12 to Oct 23
YOUR Parcel
- ✓Your exact zone, not Hinckley's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hinckley
Pull a site-specific report for your exact address in Hinckley, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hinckley averages can't show:
We read public map data around Hinckley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hinckley average
How we know this about Hinckley
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 Hinckley’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 Hinckley
When does frost risk typically end in Hinckley?
The last hard freeze (28°F) in Hinckley typically lands around Apr 12, 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 May 3.
When is the first frost in Hinckley?
The first hard freeze (28°F) in Hinckley typically arrives around Oct 23, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 9, so the watching starts about Sep 23 — about 194 days after the spring freeze cleared.
How long is the growing season in Hinckley?
Measured between 28°F hard freezes, Hinckley sees about 194 frost-free days — roughly Apr 12 through Oct 23, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 3 to Oct 9, about 159 days.
Is the soil safe to grow vegetables in Hinckley?
The federal record around Hinckley is a meaningful one — 207 documented sites, mostly Underground Storage Tanks entries (112), the nearest Underground Storage Tanks record about 0.1 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.
How do I protect my plants from frost in Hinckley?
From about Sep 23 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 Oct 23 (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 Oct 23. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Hinckley's scale — its 5b band and its 194-day season. Your yard writes its own version of Hinckley'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 Hinckley’s own scale
7 of the readings below were taken at Hinckley's own scale — its own ~194-day season between 28°F freezes, the 549 acres it covers and 207 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hinckley's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Hinckley's own 28°F hard-freeze dates, about Apr 12 and Oct 23 and the ~194-day span between themNOAA 1991–2020 Climate Normals
- 207 documented contamination sites on the federal record near Hinckley, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Hinckley's boundary and the 549 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~194-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hinckley's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Hinckleylydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Hinckley's 549 acres read through its county's SSURGO summaryfrom DeKalb County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom DeKalb 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 DeKalb County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hinckley's 549 acreswhy one lot differs from the next →
- Which side of Hinckley you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 549 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Hinckley-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisHinckley sits outside our named growing regions, so Illinois as a whole is its closest context here.