Cowden, Illinois, sits in USDA hardiness zone 6b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Crops well matched to these conditions include cabbage, hazelnut, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Cowden, 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 Cowden 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 Cowden — soil, climate, flood, and parcel records. How we handle your address.
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Cowden — the short answer
Cowden, Illinois: USDA zone 6b, about 214 days between hard freezes, across 257 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~214
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 257 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 6b is Cowden's average, not your lot's — a low corner or a tree line moves it. Against Cowden's 214-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cowden
Each reading below is measured for Cowden itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCowden runs about 214 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
MeasuredCowden sits in USDA hardiness zone 6b.
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 Cowden is in
Cowden sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Cowden's own centroid rather than borrowed from Shelby County.
What Grows in Cowden
Every plant below cleared Cowden's own zone 6b and its 214-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Cowden?
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 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 1 — 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.
What's on the federal record near Cowden
Closest first, within ~10 miles of Cowden. Listing isn't leaking, and distance isn't exposure.
- Cowden Village OfUnderground Storage Tanks · 750 ft
- Township ShedUnderground Storage Tanks · 750 ft
- Gerald A Harris Inc.Underground Storage Tanks · 750 ft
- COWDEN VILLAGE OFBrownfields · 1400 ft
- Cowden Country Food MartUnderground Storage Tanks · 1500 ft
- Miller Oil Co.Underground Storage Tanks · 2600 ft
- Francis Evans Lime & Fertilizer ServUnderground Storage Tanks · 0.5 mi
- CF INDUSTRIES - COWDEN TERMINALBrownfields · 1.2 mi
- Buchanan MarathonUnderground Storage Tanks · 1.3 mi
- Miller Oil CoUnderground Storage Tanks · 1.4 mi
- 4 miles SE of CowdenNitrate · 4.7 mi
- Miller Oil Co Liquid FertilizerUnderground Storage Tanks · 5.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Cowden'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 Cowden.
Total Sites
23
within ~10 miles of Cowden
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Cowden
Severity Distribution
within ~10 miles of Cowden
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Cowden
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 Cowden average
Your land is one point inside Cowden
Everything above resolves to Cowden as a whole — one PHZM band and one 28°F frost record, read across 257 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 Cowden Average
Cowden Average
- ●USDA Zones 6b, averaged across Cowden
- ●One soil character for all of Cowden
- ●Frost dates read at Cowden's scale: Apr 1 to Nov 1
YOUR Parcel
- ✓Your exact zone, not Cowden's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cowden
Pull a site-specific report for your exact address in Cowden, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cowden averages can't show:
We read public map data around Cowden — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cowden average
How we know this about Cowden
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 Cowden’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 Cowden
When does frost risk typically end in Cowden?
The last hard freeze (28°F) in Cowden typically lands around Apr 1, 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 22.
When is the first frost in Cowden?
The first hard freeze (28°F) in Cowden typically arrives around Nov 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 18, so the watching starts about Oct 2 — about 214 days after the spring freeze cleared.
How long is the growing season in Cowden?
Measured between 28°F hard freezes, Cowden sees about 214 frost-free days — roughly Apr 1 through Nov 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Oct 18, about 179 days.
Is the soil safe to grow vegetables in Cowden?
The federal record around Cowden is a meaningful one — 23 documented sites, mostly Underground Storage Tanks entries (17), the nearest Underground Storage Tanks record about 0.1 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 Cowden?
From about Oct 2 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 1 (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 1. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Cowden's scale — its 6b band and its 214-day season. Your yard writes its own version of Cowden'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 Cowden’s own scale
6 of the readings below were taken at Cowden's own scale — its own ~214-day season between 28°F freezes, the 257 acres it covers and 23 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cowden's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Cowden's own 28°F hard-freeze dates, about Apr 1 and Nov 1 and the ~214-day span between themNOAA 1991–2020 Climate Normals
- 23 documented contamination sites on the federal record near Cowden, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Cowden's boundary and the 257 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~214-day seasonGrowable Ground crop-matching engine
- The ecoregion at Cowden'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 Cowden's 257 acres read through its county's SSURGO summaryfrom Shelby County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Shelby 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 Shelby County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cowden's 257 acreswhy one lot differs from the next →
- Which side of Cowden you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 257 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 Cowden-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisCowden sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides