Cissna Park, Illinois, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Cissna Park, 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 Cissna Park 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 Cissna Park — soil, climate, flood, and parcel records. How we handle your address.
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Cissna Park — the short answer
Cissna Park, Illinois: USDA zone 6a, about 202 days between hard freezes, across 464 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~202
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 464 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 6a is Cissna Park's average, not your lot's — a low corner or a tree line moves it. Against Cissna Park's 202-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cissna Park
Each reading below is measured for Cissna Park itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCissna Park runs about 202 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
MeasuredCissna Park sits in USDA hardiness zone 6a.
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 Cissna Park is in
Cissna Park sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Cissna Park's own centroid rather than borrowed from Iroquois County.
What Grows in Cissna Park
Every plant below cleared Cissna Park's own zone 6a and its 202-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Cissna Park?
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 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 8 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 27 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Cissna Park
Closest first, within ~10 miles of Cissna Park. Listing isn't leaking, and distance isn't exposure.
- Boyce ElectricUnderground Storage Tanks · 200 ft
- Luke's One StopUnderground Storage Tanks · 550 ft
- Vacant LotUnderground Storage Tanks · 650 ft
- Krumwiede Farm Supply UprrUnderground Storage Tanks · 650 ft
- LTD AUTO & CYCLEBrownfields · 700 ft
- Cissna Park Village OfUnderground Storage Tanks · 850 ft
- Roundys IncUnderground Storage Tanks · 900 ft
- Bills Radio Sales & SerUnderground Storage Tanks · 900 ft
- Steiner FurnitureUnderground Storage Tanks · 1000 ft
- Schippert Water CareUnderground Storage Tanks · 1000 ft
- Cissna Park Comm Sch Dist 6Underground Storage Tanks · 1100 ft
- Rust Harold HUnderground Storage Tanks · 1100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Cissna Park'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 Cissna Park.
Total Sites
42
within ~10 miles of Cissna Park
Risk Level
Low
Highest-severity
2 concentrated animal feeding operations
Sources Checked
within ~10 miles of Cissna Park
Severity Distribution
within ~10 miles of Cissna Park
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Cissna Park, Underground Storage Tanks runs higher than the national average — 34 sites within ~10 miles of Cissna Park. 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.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Cissna Park
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 Cissna Park average
Your land is one point inside Cissna Park
Everything above resolves to Cissna Park as a whole — one PHZM band and one 28°F frost record, read across 464 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 Cissna Park Average
Cissna Park Average
- ●USDA Zones 6a, averaged across Cissna Park
- ●One soil character for all of Cissna Park
- ●Frost dates read at Cissna Park's scale: Apr 8 to Oct 27
YOUR Parcel
- ✓Your exact zone, not Cissna Park's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cissna Park
Pull a site-specific report for your exact address in Cissna Park, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cissna Park averages can't show:
We read public map data around Cissna Park — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cissna Park average
How we know this about Cissna Park
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 Cissna Park’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 Cissna Park
When does frost risk typically end in Cissna Park?
The last hard freeze (28°F) in Cissna Park typically lands around Apr 8, 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 29.
When is the first frost in Cissna Park?
The first hard freeze (28°F) in Cissna Park typically arrives around Oct 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 13, so the watching starts about Sep 27 — about 202 days after the spring freeze cleared.
How long is the growing season in Cissna Park?
Measured between 28°F hard freezes, Cissna Park sees about 202 frost-free days — roughly Apr 8 through Oct 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 29 to Oct 13, about 167 days.
Is the soil safe to grow vegetables in Cissna Park?
The federal record around Cissna Park is light — 42 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (34), the nearest Underground Storage Tanks record under a tenth of a mile out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Cissna Park?
From about Sep 27 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 27 (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 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Cissna Park's scale — its 6a band and its 202-day season. Your yard writes its own version of Cissna Park'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 Cissna Park’s own scale
6 of the readings below were taken at Cissna Park's own scale — its own ~202-day season between 28°F freezes, the 464 acres it covers and 42 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cissna Park's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Cissna Park's own 28°F hard-freeze dates, about Apr 8 and Oct 27 and the ~202-day span between themNOAA 1991–2020 Climate Normals
- 42 documented contamination sites on the federal record near Cissna Park, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Cissna Park's boundary and the 464 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~202-day seasonGrowable Ground crop-matching engine
- The ecoregion at Cissna Park's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Cissna Park's 464 acres read through its county's SSURGO summaryfrom Iroquois County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Iroquois 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 Iroquois County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cissna Park's 464 acreswhy one lot differs from the next →
- Which side of Cissna Park you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 464 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Cissna Park-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisCissna Park sits outside our named growing regions, so Illinois as a whole is its closest context here.