Chadwick, Illinois, sits in USDA hardiness zone 5a — a zone band wide enough that plant choice, not possibility, is the interesting question.
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 Chadwick, 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 Chadwick 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 Chadwick — soil, climate, flood, and parcel records. How we handle your address.
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Chadwick — the short answer
Chadwick, Illinois: USDA zone 5a, about 188 days between hard freezes, across 199 acres of town.
- USDA zone
- 5a
- 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 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~188
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 199 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 5a is Chadwick's average, not your lot's — a low corner or a tree line moves it. Against Chadwick's 188-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Chadwick
Each reading below is measured for Chadwick itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredChadwick runs about 188 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
MeasuredChadwick sits in USDA hardiness zone 5a.
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 Chadwick is in
Chadwick sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Chadwick's own centroid rather than borrowed from Carroll County.
What Grows in Chadwick
Every plant below cleared Chadwick's own zone 5a and its 188-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Chadwick?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. 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 19 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Chadwick
Closest first, within ~10 miles of Chadwick. Listing isn't leaking, and distance isn't exposure.
- Chadwick High SchoolUnderground Storage Tanks · 300 ft
- Chadwick RmlrUnderground Storage Tanks · 300 ft
- Chadwick Fire Protection DistUnderground Storage Tanks · 350 ft
- Buss DonUnderground Storage Tanks · 850 ft
- Weber Farm ServiceUnderground Storage Tanks · 1000 ft
- Webers Repair ShopUnderground Storage Tanks · 1200 ft
- ERIC L SMITH ANTIQUE AUTOSBrownfields · 1800 ft
- Timberlake ResortUnderground Storage Tanks · 3.7 mi
- 2 miles NW of MilledgevilleNitrate · 4.9 mi
- COUNTY HWY 30 KENNEDY BRIDGEBrownfields · 6.0 mi
- FAS I95 HAHNAMAN RD BRDGEBrownfields · 6.0 mi
- Rogers Oil CompanyUnderground Storage Tanks · 6.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Chadwick'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 Chadwick.
Total Sites
85
within ~10 miles of Chadwick
Risk Level
Moderate
Highest-severity
3 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Chadwick
Severity Distribution
within ~10 miles of Chadwick
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Chadwick, CAFO runs higher than the national average — 7 sites within ~10 miles of Chadwick. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Chadwick
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 Chadwick average
Your land is one point inside Chadwick
Everything above resolves to Chadwick as a whole — one PHZM band and one 28°F frost record, read across 199 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 Chadwick Average
Chadwick Average
- ●USDA Zones 5a, averaged across Chadwick
- ●One soil character for all of Chadwick
- ●Frost dates read at Chadwick's scale: Apr 14 to Oct 19
YOUR Parcel
- ✓Your exact zone, not Chadwick's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Chadwick
Pull a site-specific report for your exact address in Chadwick, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Chadwick averages can't show:
We read public map data around Chadwick — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Chadwick average
How we know this about Chadwick
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 Chadwick’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 Chadwick
When does frost risk typically end in Chadwick?
The last hard freeze (28°F) in Chadwick 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 Chadwick?
The first hard freeze (28°F) in Chadwick typically arrives around Oct 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 5, so the watching starts about Sep 19 — about 188 days after the spring freeze cleared.
How long is the growing season in Chadwick?
Measured between 28°F hard freezes, Chadwick sees about 188 frost-free days — roughly Apr 14 through Oct 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 5, about 153 days.
Is the soil safe to grow vegetables in Chadwick?
The federal record around Chadwick shows 85 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 Chadwick?
From about Sep 19 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 19 (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 19. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Chadwick's scale — its 5a band and its 188-day season. Your yard writes its own version of Chadwick'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 Chadwick’s own scale
6 of the readings below were taken at Chadwick's own scale — its own ~188-day season between 28°F freezes, the 199 acres it covers and 85 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Chadwick's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Chadwick's own 28°F hard-freeze dates, about Apr 14 and Oct 19 and the ~188-day span between themNOAA 1991–2020 Climate Normals
- 85 documented contamination sites on the federal record near Chadwick, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Chadwick's boundary and the 199 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~188-day seasonGrowable Ground crop-matching engine
- The ecoregion at Chadwick'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 Chadwick's 199 acres read through its county's SSURGO summaryfrom Carroll County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Carroll 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 Carroll County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Chadwick's 199 acreswhy one lot differs from the next →
- Which side of Chadwick you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 199 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 Chadwick-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisChadwick sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides