Concord, Illinois, sits in USDA hardiness zone 6a — a zone band wide enough that plant choice, not possibility, is the interesting question.
A short list that earns its place here — cabbage, hazelnut, lavender, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Concord, 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 Concord 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 Concord — soil, climate, flood, and parcel records. How we handle your address.
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Concord — the short answer
Concord, Illinois: USDA zone 6a, about 209 days between hard freezes, across 159 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~209
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 159 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 Concord's average, not your lot's — a low corner or a tree line moves it. Against Concord's 209-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Concord
Each reading below is measured for Concord itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredConcord runs about 209 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
MeasuredConcord 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 Concord is in
Concord sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Concord's own centroid rather than borrowed from Morgan County.
What Grows in Concord
Every plant below cleared Concord's own zone 6a and its 209-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Concord?
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 5; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 28 — 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 Concord
Closest first, within ~10 miles of Concord. Listing isn't leaking, and distance isn't exposure.
- Triopia School Dist 27Underground Storage Tanks · 450 ft
- Nickel Farm ShopUnderground Storage Tanks · 700 ft
- Bill SerUnderground Storage Tanks · 950 ft
- SIX FARMS LLC - CONCORD,FACILITYCAFO · 2.6 mi
- Lakamp Ser StationUnderground Storage Tanks · 3.4 mi
- Bethel Fs FacilityUnderground Storage Tanks · 3.4 mi
- R G S Mini MartUnderground Storage Tanks · 3.4 mi
- Chapin Fast StopUnderground Storage Tanks · 3.6 mi
- Chapin Farmers Elevator CoUnderground Storage Tanks · 3.6 mi
- CHAPIN CYLINDER HEAD COBrownfields · 3.8 mi
- Huey Forest ProductsUnderground Storage Tanks · 4.1 mi
- Ayerco #32 Convenience CenterUnderground Storage Tanks · 4.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Concord'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 Concord.
Total Sites
180
within ~10 miles of Concord
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Concord
Severity Distribution
within ~10 miles of Concord
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Concord, Underground Storage Tanks runs higher than the national average — 119 sites within ~10 miles of Concord. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Concord
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 Concord average
Your land is one point inside Concord
Everything above resolves to Concord as a whole — one PHZM band and one 28°F frost record, read across 159 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 Concord Average
Concord Average
- ●USDA Zones 6a, averaged across Concord
- ●One soil character for all of Concord
- ●Frost dates read at Concord's scale: Apr 2 to Oct 28
YOUR Parcel
- ✓Your exact zone, not Concord's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Concord
Pull a site-specific report for your exact address in Concord, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Concord averages can't show:
We read public map data around Concord — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Concord average
How we know this about Concord
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 Concord’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 Concord
When does frost risk typically end in Concord?
The last hard freeze (28°F) in Concord typically lands around Apr 2, 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 23.
When is the first frost in Concord?
The first hard freeze (28°F) in Concord typically arrives around Oct 28, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 14, so the watching starts about Sep 28 — about 209 days after the spring freeze cleared.
How long is the growing season in Concord?
Measured between 28°F hard freezes, Concord sees about 209 frost-free days — roughly Apr 2 through Oct 28, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 23 to Oct 14, about 174 days.
Is the soil safe to grow vegetables in Concord?
The federal record around Concord is a meaningful one — 180 documented sites, mostly Underground Storage Tanks entries (119), the nearest Underground Storage Tanks record under a tenth of a mile 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 Concord?
From about Sep 28 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 28 (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 28. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Concord's scale — its 6a band and its 209-day season. Your yard writes its own version of Concord'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 Concord’s own scale
6 of the readings below were taken at Concord's own scale — its own ~209-day season between 28°F freezes, the 159 acres it covers and 180 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Concord's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Concord's own 28°F hard-freeze dates, about Apr 2 and Oct 28 and the ~209-day span between themNOAA 1991–2020 Climate Normals
- 180 documented contamination sites on the federal record near Concord, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Concord's boundary and the 159 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~209-day seasonGrowable Ground crop-matching engine
- The ecoregion at Concord'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 Concord's 159 acres read through its county's SSURGO summaryfrom Morgan County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Morgan 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 Morgan County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Concord's 159 acreswhy one lot differs from the next →
- Which side of Concord you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 159 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 Concord-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisConcord sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides