South Elgin, Illinois, sits in USDA hardiness zone 5b — a zone band wide enough that plant choice, not possibility, is the interesting question.
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 South Elgin, 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 South Elgin 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 South Elgin — soil, climate, flood, and parcel records. How we handle your address.
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South Elgin — the short answer
South Elgin, Illinois: USDA zone 5b, about 190 days between hard freezes, across 5K acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~190
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 5K 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 South Elgin's average, not your lot's — a low corner or a tree line moves it. Against South Elgin's 190-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in South Elgin
Each reading below is measured for South Elgin itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSouth Elgin runs about 190 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
MeasuredSouth Elgin 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 South Elgin is in
South Elgin sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at South Elgin's own centroid rather than borrowed from Kane County.
What Grows in South Elgin
Every plant below cleared South Elgin's own zone 5b and its 190-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in South Elgin?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 22 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
Documented around South Elgin
Spotted lanternfly documented 7 miles from South Elgin, first recorded 2023. What to watch for.
What's on the federal record near South Elgin
Closest first, within ~10 miles of South Elgin. Listing isn't leaking, and distance isn't exposure.
- SOUTH ELGINPFAS · 1300 ft
- Bucky's Express #545Underground Storage Tanks · 2000 ft
- COUNTRY ONE HOUR CLEANERSBrownfields · 2100 ft
- Peters DianeUnderground Storage Tanks · 2200 ft
- MOBIL OIL CORP SS HLMBrownfields · 2200 ft
- 7-Eleven Store # 32821Underground Storage Tanks · 2300 ft
- SPRING CLEANERSBrownfields · 2400 ft
- ADVANCED WEB TECHNOLOGIES LLCBrownfields · 0.5 mi
- BUSCH ILLINOIS PROPERTY LLCBrownfields · 0.5 mi
- BABBITTING SVCBrownfields · 0.7 mi
- ILLINOIS LIFT EQUIPMENTBrownfields · 0.7 mi
- PAYLINE WESTBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from South Elgin'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 South Elgin.
Sources Checked
within ~10 miles of South Elgin
Severity Distribution
within ~10 miles of South Elgin
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around South Elgin, two things run higher than the national average within ~10 miles of South Elgin — Toxics Release Inventory (175 sites) and PFAS (15 sites). 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.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in South Elgin
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 South Elgin average
Your land is one point inside South Elgin
Everything above resolves to South Elgin as a whole — one PHZM band and one 28°F frost record, read across 5K 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 South Elgin Average
South Elgin Average
- ●USDA Zones 5b, averaged across South Elgin
- ●One soil character for all of South Elgin
- ●Frost dates read at South Elgin's scale: Apr 15 to Oct 22
YOUR Parcel
- ✓Your exact zone, not South Elgin's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in South Elgin
Pull a site-specific report for your exact address in South Elgin, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that South Elgin averages can't show:
We read public map data around South Elgin — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the South Elgin average
How we know this about South Elgin
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 South Elgin’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 South Elgin
When does frost risk typically end in South Elgin?
The last hard freeze (28°F) in South Elgin typically lands around Apr 15, 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 6.
When is the first frost in South Elgin?
The first hard freeze (28°F) in South Elgin typically arrives around Oct 22, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 8, so the watching starts about Sep 22 — about 190 days after the spring freeze cleared.
How long is the growing season in South Elgin?
Measured between 28°F hard freezes, South Elgin sees about 190 frost-free days — roughly Apr 15 through Oct 22, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 6 to Oct 8, about 155 days.
Is the soil safe to grow vegetables in South Elgin?
The federal record around South Elgin runs heavier than most — 1,739 documented sites, mostly Underground Storage Tanks entries (726), the nearest PFAS 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 South Elgin?
From about Sep 22 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 22 (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 22. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at South Elgin's scale — its 5b band and its 190-day season. Your yard writes its own version of South Elgin'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 South Elgin’s own scale
7 of the readings below were taken at South Elgin's own scale — its own ~190-day season between 28°F freezes, the 4,652 acres it covers and 1,739 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- South Elgin's own USDA hardiness band, zones 5bUSDA PHZM 2023
- South Elgin's own 28°F hard-freeze dates, about Apr 15 and Oct 22 and the ~190-day span between themNOAA 1991–2020 Climate Normals
- 1,739 documented contamination sites on the federal record near South Elgin, the closest PFAS record about 0.2 miles out from the town centreFederal environmental registers
- South Elgin's boundary and the 4,652 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~190-day seasonGrowable Ground crop-matching engine
- The ecoregion at South Elgin's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of South Elginlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so South Elgin's 4,652 acres read through its county's SSURGO summaryfrom Kane County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Kane 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 Kane County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among South Elgin's 4,652 acreswhy one lot differs from the next →
- Which side of South Elgin you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,652 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest PFAS 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 South Elgin-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisSouth Elgin sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides