Magnolia, Illinois, sits in USDA hardiness zone 5b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Crops well matched to these conditions include cabbage, cranberry, lavender, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Magnolia, 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 Magnolia 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 Magnolia — soil, climate, flood, and parcel records. How we handle your address.
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Magnolia — the short answer
Magnolia, Illinois: USDA zone 5b, about 203 days between hard freezes, across 200 acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 9
- 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
- ~203
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 200 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 Magnolia's average, not your lot's — a low corner or a tree line moves it. Against Magnolia's 203-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Magnolia
Each reading below is measured for Magnolia itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMagnolia runs about 203 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
MeasuredMagnolia 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 Magnolia is in
Magnolia sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Magnolia's own centroid rather than borrowed from Putnam County.
What Grows in Magnolia
Every plant below cleared Magnolia's own zone 5b and its 203-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Magnolia?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 12; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 9 (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. 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 Magnolia
Closest first, within ~10 miles of Magnolia. Listing isn't leaking, and distance isn't exposure.
- Mognolia Four CornersUnderground Storage Tanks · 600 ft
- DARREN BROWN FARM #2CAFO · 2.2 mi
- Grandview Ser Co-McNabbUnderground Storage Tanks · 3.9 mi
- Mair Oil CoUnderground Storage Tanks · 4.2 mi
- Jack's Gas & ServiceUnderground Storage Tanks · 4.3 mi
- Putnam County Jr HighUnderground Storage Tanks · 4.3 mi
- Griffith Seed CoUnderground Storage Tanks · 4.3 mi
- Keller Walter CUnderground Storage Tanks · 4.3 mi
- Grasser Plumbing & Heating IncUnderground Storage Tanks · 4.4 mi
- Grandview Ser CoUnderground Storage Tanks · 4.4 mi
- Varna Farms C/O Blh Farm MgtUnderground Storage Tanks · 4.9 mi
- Burnell Dale AUnderground Storage Tanks · 4.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Magnolia'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 Magnolia.
Total Sites
121
within ~10 miles of Magnolia
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Magnolia
Severity Distribution
within ~10 miles of Magnolia
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Magnolia, two things run higher than the national average within ~10 miles of Magnolia — Underground Storage Tanks (93 sites) and Toxics Release Inventory (8 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Magnolia
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 Magnolia average
Your land is one point inside Magnolia
Everything above resolves to Magnolia as a whole — one PHZM band and one 28°F frost record, read across 200 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 Magnolia Average
Magnolia Average
- ●USDA Zones 5b, averaged across Magnolia
- ●One soil character for all of Magnolia
- ●Frost dates read at Magnolia's scale: Apr 9 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Magnolia's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Magnolia
Pull a site-specific report for your exact address in Magnolia, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Magnolia averages can't show:
We read public map data around Magnolia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Magnolia average
How we know this about Magnolia
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 Magnolia’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 Magnolia
When does frost risk typically end in Magnolia?
The last hard freeze (28°F) in Magnolia typically lands around Apr 9, 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 30.
When is the first frost in Magnolia?
The first hard freeze (28°F) in Magnolia 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 203 days after the spring freeze cleared.
How long is the growing season in Magnolia?
Measured between 28°F hard freezes, Magnolia sees about 203 frost-free days — roughly Apr 9 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 30 to Oct 15, about 168 days.
Is the soil safe to grow vegetables in Magnolia?
The federal record around Magnolia is a meaningful one — 121 documented sites, mostly Underground Storage Tanks entries (93), 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 Magnolia?
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 Magnolia's scale — its 5b band and its 203-day season. Your yard writes its own version of Magnolia'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 Magnolia’s own scale
6 of the readings below were taken at Magnolia's own scale — its own ~203-day season between 28°F freezes, the 200 acres it covers and 121 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Magnolia's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Magnolia's own 28°F hard-freeze dates, about Apr 9 and Oct 29 and the ~203-day span between themNOAA 1991–2020 Climate Normals
- 121 documented contamination sites on the federal record near Magnolia, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Magnolia's boundary and the 200 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~203-day seasonGrowable Ground crop-matching engine
- The ecoregion at Magnolia'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 Magnolia's 200 acres read through its county's SSURGO summaryfrom Putnam County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Putnam 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 Putnam County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Magnolia's 200 acreswhy one lot differs from the next →
- Which side of Magnolia you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 200 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 Magnolia-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisMagnolia sits outside our named growing regions, so Illinois as a whole is its closest context here.