Dolton, Illinois, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, blueberry, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Dolton, 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 Dolton 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 Dolton — soil, climate, flood, and parcel records. How we handle your address.
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Dolton — the short answer
Dolton, Illinois: USDA zone 6a, about 224 days between hard freezes, across 3K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~224
- 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 Dolton's average, not your lot's — a low corner or a tree line moves it. Against Dolton's 224-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dolton
Each reading below is measured for Dolton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDolton runs about 224 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
MeasuredDolton 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 Dolton is in
Dolton sits in the Central Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Dolton's own centroid rather than borrowed from Cook County.
What Grows in Dolton
Every plant below cleared Dolton's own zone 6a and its 224-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Dolton?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 11 — long-season crops need about 90 days of runway, quick greens only 30. With a season this long, “too late” mostly means “switch crops” — second sowings and a full fall garden are the norm, with garlic closing the year.
Documented around Dolton
Spotted lanternfly documented 6 miles from Dolton, first recorded 2023. What to watch for.
What's on the federal record near Dolton
Closest first, within ~10 miles of Dolton. Listing isn't leaking, and distance isn't exposure.
- Main Park GarageUnderground Storage Tanks · 850 ft
- Lincolon Petro, Inc.Underground Storage Tanks · 1000 ft
- REWORLD WATER, LLCBrownfields · 1100 ft
- WATER INTEGRATED TREATMENT SYSTEMS LLCBrownfields · 1400 ft
- Roseland Metal Products IncUnderground Storage Tanks · 1500 ft
- P D Q TOOL AND STAMPING COBrownfields · 2100 ft
- Shelton Heights ConstUnderground Storage Tanks · 2200 ft
- Marathon Unit 9431Underground Storage Tanks · 2500 ft
- Dolton Aluminum Co IncUnderground Storage Tanks · 2500 ft
- DOLTON EXTRUSION CO INCToxics Release Inventory · 2500 ft
- Marine ServUnderground Storage Tanks · 2500 ft
- Sufi Mehtab, LLC / ClarkUnderground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dolton'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 Dolton.
Sources Checked
within ~10 miles of Dolton
Severity Distribution
within ~10 miles of Dolton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dolton, two things run higher than the national average within ~10 miles of Dolton — Superfund (107 sites) and Toxics Release Inventory (294 sites). That's not a problem with your land — it's information about it.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Dolton
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 Dolton average
Your land is one point inside Dolton
Everything above resolves to Dolton 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 Dolton Average
Dolton Average
- ●USDA Zones 6a, averaged across Dolton
- ●One soil character for all of Dolton
- ●Frost dates read at Dolton's scale: Apr 1 to Nov 11
YOUR Parcel
- ✓Your exact zone, not Dolton's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dolton
Pull a site-specific report for your exact address in Dolton, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dolton averages can't show:
We read public map data around Dolton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dolton average
How we know this about Dolton
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 Dolton’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 Dolton
When does frost risk typically end in Dolton?
The last hard freeze (28°F) in Dolton typically lands around Apr 1, 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 22.
When is the first frost in Dolton?
The first hard freeze (28°F) in Dolton typically arrives around Nov 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 28, so the watching starts about Oct 12 — about 224 days after the spring freeze cleared.
How long is the growing season in Dolton?
Measured between 28°F hard freezes, Dolton sees about 224 frost-free days — roughly Apr 1 through Nov 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Oct 28, about 189 days.
Is the soil safe to grow vegetables in Dolton?
The federal record around Dolton runs heavier than most — 3,853 documented sites, mostly Underground Storage Tanks entries (1,959), 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 Dolton?
From about Oct 12 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dolton's scale — its 6a band and its 224-day season. Your yard writes its own version of Dolton'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 Dolton’s own scale
7 of the readings below were taken at Dolton's own scale — its own ~224-day season between 28°F freezes, the 2,925 acres it covers and 3,853 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dolton's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Dolton's own 28°F hard-freeze dates, about Apr 1 and Nov 11 and the ~224-day span between themNOAA 1991–2020 Climate Normals
- 3,853 documented contamination sites on the federal record near Dolton, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Dolton's boundary and the 2,925 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~224-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dolton's own centroid, the Central Corn Belt PlainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Doltonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dolton's 2,925 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 Dolton's 2,925 acreswhy one lot differs from the next →
- Which side of Dolton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,925 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 Dolton-wide figureread your own land →
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