Granite City, Illinois, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, cabbage, hazelnut, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Granite 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 Granite 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 Granite City — soil, climate, flood, and parcel records. How we handle your address.
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Granite City — the short answer
Granite City, Illinois: USDA zone 7a, about 239 days between hard freezes, across 12K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~239
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 12K 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 7a is Granite City's average, not your lot's — a low corner or a tree line moves it. Against Granite City's 239-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Granite City
Each reading below is measured for Granite City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGranite City runs about 239 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
MeasuredGranite City sits in USDA hardiness zone 7a.
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 Granite City is in
Granite City sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Granite City's own centroid rather than borrowed from Madison County.
What Grows in Granite City
Every plant below cleared Granite City's own zone 7a and its 239-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Granite City?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Feb 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 16 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Granite City
Survey cells within 31 miles of Granite City checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 232 miles off. What to watch for.
What's on the federal record near Granite City
Closest first, within ~10 miles of Granite City. Listing isn't leaking, and distance isn't exposure.
- K-Mart Granite CityUnderground Storage Tanks · 750 ft
- Kmart #3137Underground Storage Tanks · 750 ft
- Obrien Tire Co IncUnderground Storage Tanks · 850 ft
- MPC #57Underground Storage Tanks · 900 ft
- MOBIL SVC STATION 05 FHBBrownfields · 950 ft
- Granite City Car WashUnderground Storage Tanks · 1000 ft
- KMART 3137Brownfields · 1000 ft
- SHOP N SAVE 4546Brownfields · 1400 ft
- Star Service & Petroleum CompanyUnderground Storage Tanks · 2100 ft
- CVS PHARMACY 10951Brownfields · 2300 ft
- Gitcho's Gas & CarsUnderground Storage Tanks · 2300 ft
- Ray Nameoki SunocoUnderground Storage Tanks · 2400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Granite 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 Granite City.
Sources Checked
within ~10 miles of Granite City
Severity Distribution
within ~10 miles of Granite City
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Granite City, two things run higher than the national average within ~10 miles of Granite City — Superfund (63 sites) and Toxics Release Inventory (197 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Granite 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 Granite City average
Your land is one point inside Granite City
Everything above resolves to Granite City as a whole — one PHZM band and one 28°F frost record, read across 12K 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 Granite City Average
Granite City Average
- ●USDA Zones 7a, averaged across Granite City
- ●One soil character for all of Granite City
- ●Frost dates read at Granite City's scale: Mar 22 to Nov 16
YOUR Parcel
- ✓Your exact zone, not Granite City's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Granite City
Pull a site-specific report for your exact address in Granite City, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Granite City averages can't show:
We read public map data around Granite City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Granite City average
How we know this about Granite 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 Granite 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 Granite City
When does frost risk typically end in Granite City?
The last hard freeze (28°F) in Granite City typically lands around Mar 22, 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 12.
When is the first frost in Granite City?
The first hard freeze (28°F) in Granite City typically arrives around Nov 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 2, so the watching starts about Oct 17 — about 239 days after the spring freeze cleared.
How long is the growing season in Granite City?
Measured between 28°F hard freezes, Granite City sees about 239 frost-free days — roughly Mar 22 through Nov 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 12 to Nov 2, about 204 days.
Is the soil safe to grow vegetables in Granite City?
The federal record around Granite City runs heavier than most — 2,581 documented sites, mostly Underground Storage Tanks entries (1,545), the nearest Underground Storage Tanks record about 0.1 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 Granite City?
From about Oct 17 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 16 (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 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Granite City's scale — its 7a band and its 239-day season. Your yard writes its own version of Granite 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 Granite City’s own scale
7 of the readings below were taken at Granite City's own scale — its own ~239-day season between 28°F freezes, the 12,170 acres it covers and 2,581 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Granite City's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Granite City's own 28°F hard-freeze dates, about Mar 22 and Nov 16 and the ~239-day span between themNOAA 1991–2020 Climate Normals
- 2,581 documented contamination sites on the federal record near Granite City, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Granite City's boundary and the 12,170 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~239-day seasonGrowable Ground crop-matching engine
- The ecoregion at Granite City's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Lanternfly survey cells around Granite City checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Granite City's 12,170 acres read through its county's SSURGO summaryfrom Madison County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Madison 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 Madison County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Granite City's 12,170 acreswhy one lot differs from the next →
- Which side of Granite 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 12,170 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Granite City-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisGranite City sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides