Cullom, Illinois, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Well-matched crops include cabbage, cranberry, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Cullom, 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 Cullom 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 Cullom — soil, climate, flood, and parcel records. How we handle your address.
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Cullom — the short answer
Cullom, Illinois: USDA zone 5b, about 202 days between hard freezes, across 216 acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~202
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 216 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 Cullom's average, not your lot's — a low corner or a tree line moves it. Against Cullom's 202-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cullom
Each reading below is measured for Cullom itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCullom runs about 202 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
MeasuredCullom 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 Cullom is in
Cullom sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Cullom's own centroid rather than borrowed from Livingston County.
What Grows in Cullom
Every plant below cleared Cullom's own zone 5b and its 202-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Cullom?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 13; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 29 — 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.
What's on the federal record near Cullom
Closest first, within ~10 miles of Cullom. Listing isn't leaking, and distance isn't exposure.
- Casey's General Store #1494Underground Storage Tanks · 250 ft
- Schades Auto SalesUnderground Storage Tanks · 300 ft
- Haag Steven RUnderground Storage Tanks · 300 ft
- Livingston Service CompanyUnderground Storage Tanks · 300 ft
- Tri Central CoopUnderground Storage Tanks · 500 ft
- Turner Bus ServiceUnderground Storage Tanks · 550 ft
- Sullivan Township OfUnderground Storage Tanks · 2100 ft
- Cullom Crop Serv IncUnderground Storage Tanks · 2100 ft
- HARMS LIVESTOCK FARMCAFO · 0.7 mi
- Hahns SerUnderground Storage Tanks · 1.7 mi
- CULLOM AUTOMOTIVEBrownfields · 1.8 mi
- JAS FARMSCAFO · 3.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Cullom'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 Cullom.
Total Sites
47
within ~10 miles of Cullom
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Cullom
Severity Distribution
within ~10 miles of Cullom
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Cullom, two things run higher than the national average within ~10 miles of Cullom — CAFO (5 sites) and Underground Storage Tanks (37 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 Cullom
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 Cullom average
Your land is one point inside Cullom
Everything above resolves to Cullom as a whole — one PHZM band and one 28°F frost record, read across 216 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 Cullom Average
Cullom Average
- ●USDA Zones 5b, averaged across Cullom
- ●One soil character for all of Cullom
- ●Frost dates read at Cullom's scale: Apr 10 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Cullom's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cullom
Pull a site-specific report for your exact address in Cullom, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cullom averages can't show:
We read public map data around Cullom — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cullom average
How we know this about Cullom
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 Cullom’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 Cullom
When does frost risk typically end in Cullom?
The last hard freeze (28°F) in Cullom typically lands around Apr 10, 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 1.
When is the first frost in Cullom?
The first hard freeze (28°F) in Cullom typically arrives around Oct 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 15, so the watching starts about Sep 29 — about 202 days after the spring freeze cleared.
How long is the growing season in Cullom?
Measured between 28°F hard freezes, Cullom sees about 202 frost-free days — roughly Apr 10 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 1 to Oct 15, about 167 days.
Is the soil safe to grow vegetables in Cullom?
The federal record around Cullom is light — 47 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (37), the nearest Underground Storage Tanks record under a tenth of a mile out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Cullom?
From about Sep 29 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 29 (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 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Cullom's scale — its 5b band and its 202-day season. Your yard writes its own version of Cullom'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 Cullom’s own scale
6 of the readings below were taken at Cullom's own scale — its own ~202-day season between 28°F freezes, the 216 acres it covers and 47 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cullom's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Cullom's own 28°F hard-freeze dates, about Apr 10 and Oct 29 and the ~202-day span between themNOAA 1991–2020 Climate Normals
- 47 documented contamination sites on the federal record near Cullom, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Cullom's boundary and the 216 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~202-day seasonGrowable Ground crop-matching engine
- The ecoregion at Cullom'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 Cullom's 216 acres read through its county's SSURGO summaryfrom Livingston County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Livingston 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 Livingston County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cullom's 216 acreswhy one lot differs from the next →
- Which side of Cullom you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 216 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 Cullom-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisCullom sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides