Eureka, Illinois, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, cabbage, cranberry, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Eureka, 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 Eureka 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 Eureka — soil, climate, flood, and parcel records. How we handle your address.
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Eureka — the short answer
Eureka, Illinois: USDA zone 5b, about 199 days between hard freezes, across 2K acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~199
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 2K 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 Eureka's average, not your lot's — a low corner or a tree line moves it. Against Eureka's 199-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Eureka
Each reading below is measured for Eureka itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredEureka runs about 199 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
MeasuredEureka 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 Eureka is in
Eureka sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Eureka's own centroid rather than borrowed from Woodford County.
What Grows in Eureka
Every plant below cleared Eureka's own zone 5b and its 199-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Eureka?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 11 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 27 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Eureka
Closest first, within ~10 miles of Eureka. Listing isn't leaking, and distance isn't exposure.
- EUREKA COLLEGEBrownfields · 1900 ft
- Eureka HsUnderground Storage Tanks · 2100 ft
- Apache Truck Lines IncUnderground Storage Tanks · 2200 ft
- Fehr BrothersUnderground Storage Tanks · 2200 ft
- Blunier VernonUnderground Storage Tanks · 2200 ft
- ADDWCUnderground Storage Tanks · 2500 ft
- CVS PHARMACY 6458Brownfields · 2600 ft
- Sam Leman Chev-Olds-Pontiac IncUnderground Storage Tanks · 2600 ft
- Cox Transfer IncUnderground Storage Tanks · 2600 ft
- COX TRANSFERBrownfields · 0.5 mi
- WUETHRICH SANCKEN INCBrownfields · 0.5 mi
- Wuethrich-Sancken IncUnderground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Eureka'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 Eureka.
Total Sites
198
within ~10 miles of Eureka
Risk Level
Moderate
Highest-severity
6 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Eureka
Severity Distribution
within ~10 miles of Eureka
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Eureka, two things run higher than the national average within ~10 miles of Eureka — CAFO (8 sites) and Underground Storage Tanks (122 sites). 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.
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 Eureka
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 Eureka average
Your land is one point inside Eureka
Everything above resolves to Eureka as a whole — one PHZM band and one 28°F frost record, read across 2K 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 city 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 Eureka Average
Eureka Average
- ●USDA Zones 5b, averaged across Eureka
- ●One soil character for all of Eureka
- ●Frost dates read at Eureka's scale: Apr 11 to Oct 27
YOUR Parcel
- ✓Your exact zone, not Eureka's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Eureka
Pull a site-specific report for your exact address in Eureka, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Eureka averages can't show:
We read public map data around Eureka — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Eureka average
How we know this about Eureka
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Eureka’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 city grain anywhere on this page — there is no city-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 Eureka
When does frost risk typically end in Eureka?
The last hard freeze (28°F) in Eureka typically lands around Apr 11, 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 2.
When is the first frost in Eureka?
The first hard freeze (28°F) in Eureka typically arrives around Oct 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 13, so the watching starts about Sep 27 — about 199 days after the spring freeze cleared.
How long is the growing season in Eureka?
Measured between 28°F hard freezes, Eureka sees about 199 frost-free days — roughly Apr 11 through Oct 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 2 to Oct 13, about 164 days.
Is the soil safe to grow vegetables in Eureka?
The federal record around Eureka shows 198 documented sites, mostly Underground Storage Tanks entries (122), the nearest Brownfields record about 0.4 miles 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 Eureka?
From about Sep 27 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 27 (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 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Eureka's scale — its 5b band and its 199-day season. Your yard writes its own version of Eureka'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 Eureka’s own scale
6 of the readings below were taken at Eureka's own scale — its own ~199-day season between 28°F freezes, the 1,750 acres it covers and 198 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Eureka's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Eureka's own 28°F hard-freeze dates, about Apr 11 and Oct 27 and the ~199-day span between themNOAA 1991–2020 Climate Normals
- 198 documented contamination sites on the federal record near Eureka, the closest Brownfields record about 0.4 miles out from the town centreFederal environmental registers
- Eureka's boundary and the 1,750 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~199-day seasonGrowable Ground crop-matching engine
- The ecoregion at Eureka'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 Eureka's 1,750 acres read through its county's SSURGO summaryfrom Woodford County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Woodford 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 Woodford County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Eureka's 1,750 acreswhy one lot differs from the next →
- Which side of Eureka you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,750 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.4 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 Eureka-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisEureka sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides