Carol Stream, Illinois, sits in USDA hardiness zone 5b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
The conditions favor cabbage, cranberry, lavender, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Carol Stream, 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 Carol Stream 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 Carol Stream — soil, climate, flood, and parcel records. How we handle your address.
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Carol Stream — the short answer
Carol Stream, Illinois: USDA zone 5b, about 195 days between hard freezes, across 6K acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~195
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 6K 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 Carol Stream's average, not your lot's — a low corner or a tree line moves it. Against Carol Stream's 195-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Carol Stream
Each reading below is measured for Carol Stream itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCarol Stream runs about 195 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
MeasuredCarol Stream 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 Carol Stream is in
Carol Stream sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Carol Stream's own centroid rather than borrowed from DuPage County.
What Grows in Carol Stream
Every plant below cleared Carol Stream's own zone 5b and its 195-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Carol Stream?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 14 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 26 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
Documented around Carol Stream
Spotted lanternfly documented 8 miles from Carol Stream, first recorded 2023. What to watch for.
What's on the federal record near Carol Stream
Closest first, within ~10 miles of Carol Stream. Listing isn't leaking, and distance isn't exposure.
- Village Of Carol Stream Well 6Underground Storage Tanks · 1300 ft
- CAROL STREAMPFAS · 1900 ft
- ROYAL POWER SOLUTIONSBrownfields · 0.7 mi
- Glenbard North High SchoolUnderground Storage Tanks · 0.7 mi
- WYETH AYERST LABORATORIESBrownfields · 0.7 mi
- Dc WarehouseUnderground Storage Tanks · 0.7 mi
- MERCEDES BENZ USA LLCBrownfields · 0.7 mi
- INTERNATIONAL PAPERToxics Release Inventory · 0.7 mi
- INTERNATIONAL PAPERBrownfields · 0.7 mi
- CEVA LOGISTICS INCBrownfields · 0.7 mi
- TRANS TECHBrownfields · 0.8 mi
- TRANS TECHToxics Release Inventory · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Carol Stream'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 Carol Stream.
Sources Checked
within ~10 miles of Carol Stream
Severity Distribution
within ~10 miles of Carol Stream
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Carol Stream, Toxics Release Inventory runs higher than the national average — 311 sites within ~10 miles of Carol Stream. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Carol Stream
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 Carol Stream average
Your land is one point inside Carol Stream
Everything above resolves to Carol Stream as a whole — one PHZM band and one 28°F frost record, read across 6K 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 Carol Stream Average
Carol Stream Average
- ●USDA Zones 5b, averaged across Carol Stream
- ●One soil character for all of Carol Stream
- ●Frost dates read at Carol Stream's scale: Apr 14 to Oct 26
YOUR Parcel
- ✓Your exact zone, not Carol Stream's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Carol Stream
Pull a site-specific report for your exact address in Carol Stream, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Carol Stream averages can't show:
We read public map data around Carol Stream — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Carol Stream average
How we know this about Carol Stream
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 Carol Stream’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 Carol Stream
When does frost risk typically end in Carol Stream?
The last hard freeze (28°F) in Carol Stream typically lands around Apr 14, 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 5.
When is the first frost in Carol Stream?
The first hard freeze (28°F) in Carol Stream typically arrives around Oct 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 12, so the watching starts about Sep 26 — about 195 days after the spring freeze cleared.
How long is the growing season in Carol Stream?
Measured between 28°F hard freezes, Carol Stream sees about 195 frost-free days — roughly Apr 14 through Oct 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 5 to Oct 12, about 160 days.
Is the soil safe to grow vegetables in Carol Stream?
The federal record around Carol Stream runs heavier than most — 3,429 documented sites, mostly Brownfields entries (1,490), the nearest Underground Storage Tanks record about 0.2 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 Carol Stream?
From about Sep 26 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 26 (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 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Carol Stream's scale — its 5b band and its 195-day season. Your yard writes its own version of Carol Stream'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 Carol Stream’s own scale
7 of the readings below were taken at Carol Stream's own scale — its own ~195-day season between 28°F freezes, the 5,853 acres it covers and 3,429 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Carol Stream's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Carol Stream's own 28°F hard-freeze dates, about Apr 14 and Oct 26 and the ~195-day span between themNOAA 1991–2020 Climate Normals
- 3,429 documented contamination sites on the federal record near Carol Stream, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Carol Stream's boundary and the 5,853 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~195-day seasonGrowable Ground crop-matching engine
- The ecoregion at Carol Stream's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Carol Streamlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Carol Stream's 5,853 acres read through its county's SSURGO summaryfrom DuPage County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom DuPage 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 DuPage County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Carol Stream's 5,853 acreswhy one lot differs from the next →
- Which side of Carol Stream you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,853 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 Carol Stream-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisCarol Stream sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides