Woodhull, Illinois, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Crops well matched to these conditions include cabbage, cranberry, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Woodhull, 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 Woodhull 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 Woodhull — soil, climate, flood, and parcel records. How we handle your address.
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Woodhull — the short answer
Woodhull, Illinois: USDA zone 5b, about 194 days between hard freezes, across 562 acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~194
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 562 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 Woodhull's average, not your lot's — a low corner or a tree line moves it. Against Woodhull's 194-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Woodhull
Each reading below is measured for Woodhull itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWoodhull 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
MeasuredWoodhull 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 Woodhull is in
Woodhull sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Woodhull's own centroid rather than borrowed from Henry County.
What Grows in Woodhull
Every plant below cleared Woodhull'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 Woodhull?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 13 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 24 — 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 Woodhull
Closest first, within ~10 miles of Woodhull. Listing isn't leaking, and distance isn't exposure.
- Express Lane, Inc.Underground Storage Tanks · 200 ft
- Cowser Standard SerUnderground Storage Tanks · 500 ft
- Wood Hull Travel PlazaUnderground Storage Tanks · 650 ft
- PIONEER HI BRED INTERNATIONAL INCBrownfields · 700 ft
- AUTO BODY WORKS & ALIGNMENTBrownfields · 1900 ft
- Johnson ConstUnderground Storage Tanks · 2000 ft
- Alwood Serv CenterUnderground Storage Tanks · 0.6 mi
- Bolduc & Sons IncUnderground Storage Tanks · 0.6 mi
- Clover Twp Local GovUnderground Storage Tanks · 0.6 mi
- Bolduc-Sons IncUnderground Storage Tanks · 0.7 mi
- Alwood Bus GarageUnderground Storage Tanks · 0.7 mi
- Pilot Travel Center #476Underground Storage Tanks · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Woodhull'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 Woodhull.
Total Sites
76
within ~10 miles of Woodhull
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Woodhull
Severity Distribution
within ~10 miles of Woodhull
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Woodhull, two things run higher than the national average within ~10 miles of Woodhull — CAFO (14 sites) and Underground Storage Tanks (50 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Woodhull
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 Woodhull average
Your land is one point inside Woodhull
Everything above resolves to Woodhull as a whole — one PHZM band and one 28°F frost record, read across 562 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 Woodhull Average
Woodhull Average
- ●USDA Zones 5b, averaged across Woodhull
- ●One soil character for all of Woodhull
- ●Frost dates read at Woodhull's scale: Apr 13 to Oct 24
YOUR Parcel
- ✓Your exact zone, not Woodhull's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Woodhull
Pull a site-specific report for your exact address in Woodhull, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Woodhull averages can't show:
We read public map data around Woodhull — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Woodhull average
How we know this about Woodhull
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 Woodhull’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 Woodhull
When does frost risk typically end in Woodhull?
The last hard freeze (28°F) in Woodhull typically lands around Apr 13, 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 4.
When is the first frost in Woodhull?
The first hard freeze (28°F) in Woodhull typically arrives around Oct 24, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 10, so the watching starts about Sep 24 — about 194 days after the spring freeze cleared.
How long is the growing season in Woodhull?
Measured between 28°F hard freezes, Woodhull sees about 194 frost-free days — roughly Apr 13 through Oct 24, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 4 to Oct 10, about 159 days.
Is the soil safe to grow vegetables in Woodhull?
The federal record around Woodhull shows 76 documented sites, mostly Underground Storage Tanks entries (50), 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 Woodhull?
From about Sep 24 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 24 (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 24. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Woodhull's scale — its 5b band and its 194-day season. Your yard writes its own version of Woodhull'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 Woodhull’s own scale
6 of the readings below were taken at Woodhull's own scale — its own ~194-day season between 28°F freezes, the 562 acres it covers and 76 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Woodhull's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Woodhull's own 28°F hard-freeze dates, about Apr 13 and Oct 24 and the ~194-day span between themNOAA 1991–2020 Climate Normals
- 76 documented contamination sites on the federal record near Woodhull, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Woodhull's boundary and the 562 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 Woodhull's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Woodhull's 562 acres read through its county's SSURGO summaryfrom Henry County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Henry 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 Henry County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Woodhull's 562 acreswhy one lot differs from the next →
- Which side of Woodhull you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 562 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 Woodhull-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisWoodhull sits outside our named growing regions, so Illinois as a whole is its closest context here.