Calumet City, Illinois, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Reliable performers under these conditions include cabbage, blueberry, lavender, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Calumet City, 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 Calumet City 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 Calumet City — soil, climate, flood, and parcel records. How we handle your address.
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Calumet City — the short answer
Calumet City, Illinois: USDA zone 6a, about 220 days between hard freezes, across 5K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~220
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 5K 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 6a is Calumet City's average, not your lot's — a low corner or a tree line moves it. Against Calumet City's 220-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Calumet City
Each reading below is measured for Calumet City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCalumet City runs about 220 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredCalumet City sits in USDA hardiness zone 6a.
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 Calumet City is in
Calumet City sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Calumet City's own centroid rather than borrowed from Cook County.
What Grows in Calumet City
Every plant below cleared Calumet City's own zone 6a and its 220-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Calumet City?
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 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 10 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Calumet City
Spotted lanternfly documented 10 miles from Calumet City, first recorded 2023. What to watch for.
What's on the federal record near Calumet City
Closest first, within ~10 miles of Calumet City. Listing isn't leaking, and distance isn't exposure.
- Venture Store #15Underground Storage Tanks · 1000 ft
- Ridgeway Petroleum IncUnderground Storage Tanks · 1200 ft
- Ciastko BrosUnderground Storage Tanks · 1300 ft
- PREMIER AUTO REPAIR & TIRE INCBrownfields · 1300 ft
- River Oaks Ford IncUnderground Storage Tanks · 1300 ft
- M & A Auto SalesUnderground Storage Tanks · 1500 ft
- Aacorn TransmissionUnderground Storage Tanks · 1500 ft
- COSDEN OIL & CHEMICAL COMPANYSuperfund · 1900 ft
- River Oaks Car WashUnderground Storage Tanks · 2000 ft
- Hadady Machining Co IncUnderground Storage Tanks · 2300 ft
- ZEGERS INCBrownfields · 2400 ft
- ZEGERS INCToxics Release Inventory · 2400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Calumet City'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 Calumet City.
Sources Checked
within ~10 miles of Calumet City
Severity Distribution
within ~10 miles of Calumet City
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Calumet City, two things run higher than the national average within ~10 miles of Calumet City — Superfund (116 sites) and Toxics Release Inventory (273 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Calumet City
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 Calumet City average
Your land is one point inside Calumet City
Everything above resolves to Calumet City as a whole — one PHZM band and one 28°F frost record, read across 5K 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 Calumet City Average
Calumet City Average
- ●USDA Zones 6a, averaged across Calumet City
- ●One soil character for all of Calumet City
- ●Frost dates read at Calumet City's scale: Apr 4 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Calumet City's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Calumet City
Pull a site-specific report for your exact address in Calumet City, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Calumet City averages can't show:
We read public map data around Calumet City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Calumet City average
How we know this about Calumet City
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 Calumet City’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 Calumet City
When does frost risk typically end in Calumet City?
The last hard freeze (28°F) in Calumet City typically lands around Apr 4, 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 Apr 25.
When is the first frost in Calumet City?
The first hard freeze (28°F) in Calumet City typically arrives around Nov 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 27, so the watching starts about Oct 11 — about 220 days after the spring freeze cleared.
How long is the growing season in Calumet City?
Measured between 28°F hard freezes, Calumet City sees about 220 frost-free days — roughly Apr 4 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 27, about 185 days.
Is the soil safe to grow vegetables in Calumet City?
The federal record around Calumet City runs heavier than most — 3,379 documented sites, mostly Underground Storage Tanks entries (1,647), the nearest Underground Storage Tanks record about 0.2 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Calumet City?
From about Oct 11 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 Nov 10 (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 Nov 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Calumet City's scale — its 6a band and its 220-day season. Your yard writes its own version of Calumet City'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 Calumet City’s own scale
7 of the readings below were taken at Calumet City's own scale — its own ~220-day season between 28°F freezes, the 4,607 acres it covers and 3,379 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Calumet City's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Calumet City's own 28°F hard-freeze dates, about Apr 4 and Nov 10 and the ~220-day span between themNOAA 1991–2020 Climate Normals
- 3,379 documented contamination sites on the federal record near Calumet City, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Calumet City's boundary and the 4,607 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~220-day seasonGrowable Ground crop-matching engine
- The ecoregion at Calumet City's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Calumet Citylydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Calumet City's 4,607 acres read through its county's SSURGO summaryfrom Cook County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cook 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 Cook County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Calumet City's 4,607 acreswhy one lot differs from the next →
- Which side of Calumet City you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,607 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Calumet City-wide figureread your own land →
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