Franklin Park, Illinois, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, blueberry, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Franklin 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 Franklin 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 Franklin Park — soil, climate, flood, and parcel records. How we handle your address.
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Franklin Park — the short answer
Franklin Park, Illinois: USDA zone 6a, about 221 days between hard freezes, across 3K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 10
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~221
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K 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 Franklin Park's average, not your lot's — a low corner or a tree line moves it. Against Franklin Park's 221-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Franklin Park
Each reading below is measured for Franklin Park itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredFranklin Park runs about 221 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
MeasuredFranklin 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 Franklin Park is in
Franklin Park sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Franklin Park's own centroid rather than borrowed from Cook County.
What Grows in Franklin Park
Every plant below cleared Franklin Park's own zone 6a and its 221-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Franklin Park?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 10 — 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.
Documented around Franklin Park
Spotted lanternfly documented 12 miles from Franklin Park, first recorded 2023. What to watch for.
What's on the federal record near Franklin Park
Closest first, within ~10 miles of Franklin Park. Listing isn't leaking, and distance isn't exposure.
- MIDWEST BRASS FORGING CO INCBrownfields · 1100 ft
- FRANKLIN PARKPFAS · 1200 ft
- FLEXPAK PACKAGIHG PRODUCTS INCBrownfields · 1400 ft
- RUBICON TECHNOLOGY INCBrownfields · 1500 ft
- Encore RestaurantUnderground Storage Tanks · 1500 ft
- Y NOT AUTO BODYBrownfields · 1600 ft
- RPN Petro, Inc. d/b/a O'Hare MobilUnderground Storage Tanks · 1600 ft
- KNOWLES ELECTRONICS, INC.Toxics Release Inventory · 1600 ft
- Masterform Tool CoUnderground Storage Tanks · 1600 ft
- Frito-Lay IncUnderground Storage Tanks · 1600 ft
- GRAPH-ON INCToxics Release Inventory · 1600 ft
- QC FINISHERSBrownfields · 1700 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Franklin 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 Franklin Park.
Total Sites
6,941
within ~10 miles of Franklin Park
Risk Level
Elevated
Highest-severity
57 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Franklin Park
Severity Distribution
within ~10 miles of Franklin Park
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Franklin Park, Toxics Release Inventory runs higher than the national average — 719 sites within ~10 miles of Franklin Park. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Franklin 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 Franklin Park average
Your land is one point inside Franklin Park
Everything above resolves to Franklin Park as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Franklin Park Average
Franklin Park Average
- ●USDA Zones 6a, averaged across Franklin Park
- ●One soil character for all of Franklin Park
- ●Frost dates read at Franklin Park's scale: Apr 3 to Nov 10
YOUR Parcel
- ✓Your exact zone, not Franklin Park's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Franklin Park
Pull a site-specific report for your exact address in Franklin Park, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Franklin Park averages can't show:
We read public map data around Franklin Park — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Franklin Park average
How we know this about Franklin 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 Franklin 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 Franklin Park
When does frost risk typically end in Franklin Park?
The last hard freeze (28°F) in Franklin Park typically lands around Apr 3, 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 24.
When is the first frost in Franklin Park?
The first hard freeze (28°F) in Franklin Park typically arrives around Nov 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 27, so the watching starts about Oct 11 — about 221 days after the spring freeze cleared.
How long is the growing season in Franklin Park?
Measured between 28°F hard freezes, Franklin Park sees about 221 frost-free days — roughly Apr 3 through Nov 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 24 to Oct 27, about 186 days.
Is the soil safe to grow vegetables in Franklin Park?
The federal record around Franklin Park is a meaningful one — 6,941 documented sites, mostly Underground Storage Tanks entries (3,255), the nearest Brownfields record about 0.2 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 Franklin Park?
From about Oct 11 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 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Franklin Park's scale — its 6a band and its 221-day season. Your yard writes its own version of Franklin 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 Franklin Park’s own scale
7 of the readings below were taken at Franklin Park's own scale — its own ~221-day season between 28°F freezes, the 3,057 acres it covers and 6,941 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Franklin Park's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Franklin Park's own 28°F hard-freeze dates, about Apr 3 and Nov 10 and the ~221-day span between themNOAA 1991–2020 Climate Normals
- 6,941 documented contamination sites on the federal record near Franklin Park, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Franklin Park's boundary and the 3,057 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~221-day seasonGrowable Ground crop-matching engine
- The ecoregion at Franklin Park's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Franklin Parklydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Franklin Park's 3,057 acres read through its county's SSURGO summaryfrom Cook County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cook 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 Cook County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Franklin Park's 3,057 acreswhy one lot differs from the next →
- Which side of Franklin 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 3,057 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Franklin Park-wide figureread your own land →