Big Foot Prairie, Illinois, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Expect cabbage, cranberry, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Big Foot Prairie, 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 Big Foot Prairie 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 Big Foot Prairie — soil, climate, flood, and parcel records. How we handle your address.
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Big Foot Prairie — the short answer
Big Foot Prairie, Illinois: USDA zone 5b, about 191 days between hard freezes, across 143 acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~191
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 143 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 Big Foot Prairie's average, not your lot's — a low corner or a tree line moves it. Against Big Foot Prairie's 191-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Big Foot Prairie
Each reading below is measured for Big Foot Prairie itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBig Foot Prairie runs about 191 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
MeasuredBig Foot Prairie 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 Big Foot Prairie is in
Big Foot Prairie sits in the Southeastern Wisconsin Till Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Big Foot Prairie's own centroid rather than borrowed from McHenry County.
What Grows in Big Foot Prairie
Every plant below cleared Big Foot Prairie's own zone 5b and its 191-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Big Foot Prairie?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 22 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Big Foot Prairie
Closest first, within ~10 miles of Big Foot Prairie. Listing isn't leaking, and distance isn't exposure.
- Alum-I-Tank, Inc.Underground Storage Tanks · 350 ft
- Powell Gravel & Excavating IncUnderground Storage Tanks · 900 ft
- BIGFOOT CATTLE COMPANY-HARVARDToxics Release Inventory · 1200 ft
- RAYMOND H REESEUnderground Storage Tanks · 1.2 mi
- MC HUGH MEDICAL CLINICUnderground Storage Tanks · 1.3 mi
- ROWBOTHAM FARMSUnderground Storage Tanks · 1.6 mi
- POLY FLEX INCUnderground Storage Tanks · 1.8 mi
- JOHNSON TRACTOR INCBrownfields · 2.3 mi
- Beaver Run Sod FarmUnderground Storage Tanks · 2.3 mi
- 46N 5E-24.8hNitrate · 2.3 mi
- Robert Fritz FarmsUnderground Storage Tanks · 2.3 mi
- 46N6E-08.46l (2-ALD-D)Nitrate · 2.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Big Foot Prairie'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 Big Foot Prairie.
Total Sites
489
within ~10 miles of Big Foot Prairie
Risk Level
Elevated
Highest-severity
4 Superfund sites
Sources Checked
within ~10 miles of Big Foot Prairie
Severity Distribution
within ~10 miles of Big Foot Prairie
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Big Foot Prairie, Toxics Release Inventory runs higher than the national average — 30 sites within ~10 miles of Big Foot Prairie. That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Big Foot Prairie
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 Big Foot Prairie average
Your land is one point inside Big Foot Prairie
Everything above resolves to Big Foot Prairie as a whole — one PHZM band and one 28°F frost record, read across 143 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 Big Foot Prairie Average
Big Foot Prairie Average
- ●USDA Zones 5b, averaged across Big Foot Prairie
- ●One soil character for all of Big Foot Prairie
- ●Frost dates read at Big Foot Prairie's scale: Apr 14 to Oct 22
YOUR Parcel
- ✓Your exact zone, not Big Foot Prairie's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Big Foot Prairie
Pull a site-specific report for your exact address in Big Foot Prairie, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Big Foot Prairie averages can't show:
We read public map data around Big Foot Prairie — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Big Foot Prairie average
How we know this about Big Foot Prairie
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 Big Foot Prairie’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 Big Foot Prairie
When does frost risk typically end in Big Foot Prairie?
The last hard freeze (28°F) in Big Foot Prairie typically lands around Apr 14, 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 5.
When is the first frost in Big Foot Prairie?
The first hard freeze (28°F) in Big Foot Prairie typically arrives around Oct 22, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 8, so the watching starts about Sep 22 — about 191 days after the spring freeze cleared.
How long is the growing season in Big Foot Prairie?
Measured between 28°F hard freezes, Big Foot Prairie sees about 191 frost-free days — roughly Apr 14 through Oct 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 8, about 156 days.
Is the soil safe to grow vegetables in Big Foot Prairie?
The federal record around Big Foot Prairie is a meaningful one — 489 documented sites, mostly Underground Storage Tanks entries (254), the nearest Underground Storage Tanks record under a tenth of a mile 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 Big Foot Prairie?
From about Sep 22 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 22 (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 22. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Big Foot Prairie's scale — its 5b band and its 191-day season. Your yard writes its own version of Big Foot Prairie'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 Big Foot Prairie’s own scale
6 of the readings below were taken at Big Foot Prairie's own scale — its own ~191-day season between 28°F freezes, the 143 acres it covers and 489 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Big Foot Prairie's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Big Foot Prairie's own 28°F hard-freeze dates, about Apr 14 and Oct 22 and the ~191-day span between themNOAA 1991–2020 Climate Normals
- 489 documented contamination sites on the federal record near Big Foot Prairie, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Big Foot Prairie's boundary and the 143 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~191-day seasonGrowable Ground crop-matching engine
- The ecoregion at Big Foot Prairie's own centroid, the Southeastern Wisconsin Till PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Big Foot Prairie's 143 acres read through its county's SSURGO summaryfrom McHenry County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom McHenry 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 McHenry County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Big Foot Prairie's 143 acreswhy one lot differs from the next →
- Which side of Big Foot Prairie you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 143 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 Big Foot Prairie-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisBig Foot Prairie sits outside our named growing regions, so Illinois as a whole is its closest context here.