Columbia, Illinois, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Expect cabbage, hazelnut, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Columbia, 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 Columbia 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 Columbia — soil, climate, flood, and parcel records. How we handle your address.
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Columbia — the short answer
Columbia, Illinois: USDA zone 7a, about 232 days between hard freezes, across 7K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 23
- 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
- ~232
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 7K 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 Columbia's average, not your lot's — a low corner or a tree line moves it. Against Columbia's 232-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Columbia
Each reading below is measured for Columbia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredColumbia runs about 232 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
MeasuredColumbia 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 Columbia is in
Columbia sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Columbia's own centroid rather than borrowed from Monroe County.
What Grows in Columbia
Every plant below cleared Columbia's own zone 7a and its 232-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Columbia?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 23; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 23 (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. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Columbia
Survey cells within 31 miles of Columbia checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 251 miles off. What to watch for.
What's on the federal record near Columbia
Closest first, within ~10 miles of Columbia. Listing isn't leaking, and distance isn't exposure.
- Midwest Petroleum #56Underground Storage Tanks · 1500 ft
- LUHR BROTHERS INCBrownfields · 1900 ft
- Luhr Bros., Inc.Underground Storage Tanks · 2100 ft
- Lamberts Custom Muffler IncUnderground Storage Tanks · 2100 ft
- Mrt Division 7Underground Storage Tanks · 2200 ft
- Parkview Elementary SchoolUnderground Storage Tanks · 0.5 mi
- ENABLE MRT - COLUMBIA OFFICEBrownfields · 0.5 mi
- Linnemann Oil CoUnderground Storage Tanks · 0.6 mi
- Progressive Recovery IncUnderground Storage Tanks · 0.6 mi
- Red Roof Liquor and Lottery, Inc.Underground Storage Tanks · 0.7 mi
- Neighborhood Service StationUnderground Storage Tanks · 0.7 mi
- NEIGHBORHOOD SERVICE CENTERBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Columbia'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 Columbia.
Sources Checked
within ~10 miles of Columbia
Severity Distribution
within ~10 miles of Columbia
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Columbia, two things run higher than the national average within ~10 miles of Columbia — Superfund (28 sites) and Toxics Release Inventory (75 sites). That's not a problem with your land — it's information about 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 Columbia
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 Columbia average
Your land is one point inside Columbia
Everything above resolves to Columbia as a whole — one PHZM band and one 28°F frost record, read across 7K 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 Columbia Average
Columbia Average
- ●USDA Zones 7a, averaged across Columbia
- ●One soil character for all of Columbia
- ●Frost dates read at Columbia's scale: Mar 23 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Columbia's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Columbia
Pull a site-specific report for your exact address in Columbia, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Columbia averages can't show:
We read public map data around Columbia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Columbia average
How we know this about Columbia
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 Columbia’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 Columbia
When does frost risk typically end in Columbia?
The last hard freeze (28°F) in Columbia typically lands around Mar 23, 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 13.
When is the first frost in Columbia?
The first hard freeze (28°F) in Columbia 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 232 days after the spring freeze cleared.
How long is the growing season in Columbia?
Measured between 28°F hard freezes, Columbia sees about 232 frost-free days — roughly Mar 23 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 13 to Oct 27, about 197 days.
Is the soil safe to grow vegetables in Columbia?
The federal record around Columbia is a meaningful one — 1,218 documented sites, mostly Underground Storage Tanks entries (696), the nearest Underground Storage Tanks record about 0.3 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Columbia?
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 Columbia's scale — its 7a band and its 232-day season. Your yard writes its own version of Columbia'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 Columbia’s own scale
7 of the readings below were taken at Columbia's own scale — its own ~232-day season between 28°F freezes, the 6,752 acres it covers and 1,218 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Columbia's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Columbia's own 28°F hard-freeze dates, about Mar 23 and Nov 10 and the ~232-day span between themNOAA 1991–2020 Climate Normals
- 1,218 documented contamination sites on the federal record near Columbia, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Columbia's boundary and the 6,752 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~232-day seasonGrowable Ground crop-matching engine
- The ecoregion at Columbia's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Lanternfly survey cells around Columbia 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 Columbia's 6,752 acres read through its county's SSURGO summaryfrom Monroe County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Monroe 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 Monroe County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Columbia's 6,752 acreswhy one lot differs from the next →
- Which side of Columbia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 6,752 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 Columbia-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisColumbia sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides