Galesburg, Illinois, sits in USDA hardiness zone 5b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Expect cabbage, cranberry, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Galesburg, 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 Galesburg 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 Galesburg — soil, climate, flood, and parcel records. How we handle your address.
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Galesburg — the short answer
Galesburg, Illinois: USDA zone 5b, about 198 days between hard freezes, across 11K acres of city.
- 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 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~198
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 11K 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 Galesburg's average, not your lot's — a low corner or a tree line moves it. Against Galesburg's 198-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Galesburg
Each reading below is measured for Galesburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGalesburg runs about 198 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
MeasuredGalesburg 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 Galesburg is in
Galesburg sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Galesburg's own centroid rather than borrowed from Knox County.
What Grows in Galesburg
Every plant below cleared Galesburg's own zone 5b and its 198-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Galesburg?
Almost never — the real question is what to plant next. 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 25 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Galesburg
Closest first, within ~10 miles of Galesburg. Listing isn't leaking, and distance isn't exposure.
- Mccabe Scrap Iron & MaterialsUnderground Storage Tanks · 800 ft
- West K MartUnderground Storage Tanks · 950 ft
- Casey's General Store #2188Underground Storage Tanks · 1100 ft
- JOES AUTOBODY SHOPBrownfields · 1100 ft
- Gustafson Tire & AutoUnderground Storage Tanks · 1100 ft
- ZiebartUnderground Storage Tanks · 1200 ft
- Bob Weaver BuickUnderground Storage Tanks · 1300 ft
- Galesburg Sanitary DistUnderground Storage Tanks · 1400 ft
- PARTS HOUSE INCBrownfields · 1500 ft
- AT&S RAILWAY CO GALESBURGBrownfields · 1500 ft
- Galesburg Lincoln Mercury CorpUnderground Storage Tanks · 1600 ft
- Cantrell Rental ServiceUnderground Storage Tanks · 1600 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Galesburg'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 Galesburg.
Sources Checked
within ~10 miles of Galesburg
Severity Distribution
within ~10 miles of Galesburg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Galesburg, two things run higher than the national average within ~10 miles of Galesburg — CAFO (8 sites) and Superfund (4 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.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Galesburg
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 Galesburg average
Your land is one point inside Galesburg
Everything above resolves to Galesburg as a whole — one PHZM band and one 28°F frost record, read across 11K 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 Galesburg Average
Galesburg Average
- ●USDA Zones 5b, averaged across Galesburg
- ●One soil character for all of Galesburg
- ●Frost dates read at Galesburg's scale: Apr 10 to Oct 25
YOUR Parcel
- ✓Your exact zone, not Galesburg's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Galesburg
Pull a site-specific report for your exact address in Galesburg, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Galesburg averages can't show:
We read public map data around Galesburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Galesburg average
How we know this about Galesburg
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 Galesburg’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 Galesburg
When does frost risk typically end in Galesburg?
The last hard freeze (28°F) in Galesburg 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 Galesburg?
The first hard freeze (28°F) in Galesburg typically arrives around Oct 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 11, so the watching starts about Sep 25 — about 198 days after the spring freeze cleared.
How long is the growing season in Galesburg?
Measured between 28°F hard freezes, Galesburg sees about 198 frost-free days — roughly Apr 10 through Oct 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 1 to Oct 11, about 163 days.
Is the soil safe to grow vegetables in Galesburg?
The federal record around Galesburg is a meaningful one — 266 documented sites, mostly Underground Storage Tanks entries (168), the nearest Underground Storage Tanks record about 0.2 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 Galesburg?
From about Sep 25 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 25 (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 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Galesburg's scale — its 5b band and its 198-day season. Your yard writes its own version of Galesburg'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 Galesburg’s own scale
6 of the readings below were taken at Galesburg's own scale — its own ~198-day season between 28°F freezes, the 11,376 acres it covers and 266 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Galesburg's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Galesburg's own 28°F hard-freeze dates, about Apr 10 and Oct 25 and the ~198-day span between themNOAA 1991–2020 Climate Normals
- 266 documented contamination sites on the federal record near Galesburg, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Galesburg's boundary and the 11,376 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~198-day seasonGrowable Ground crop-matching engine
- The ecoregion at Galesburg's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Galesburg's 11,376 acres read through its county's SSURGO summaryfrom Knox County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Knox 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 Knox County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Galesburg's 11,376 acreswhy one lot differs from the next →
- Which side of Galesburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 11,376 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 Galesburg-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisGalesburg sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides