Rosiclare, Illinois, sits in USDA hardiness zone 7a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Crops well matched to these conditions include cabbage, hazelnut, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Rosiclare, 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 Rosiclare 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 Rosiclare — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Rosiclare — the short answer
Rosiclare, Illinois: USDA zone 7a, about 225 days between hard freezes, across 1K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~225
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K 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 7a is Rosiclare's average, not your lot's — a low corner or a tree line moves it. Against Rosiclare's 225-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rosiclare
Each reading below is measured for Rosiclare itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRosiclare runs about 225 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
MeasuredRosiclare sits in USDA hardiness zone 7a.
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 Rosiclare is in
Rosiclare sits in the Interior Plateau — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Rosiclare's own centroid rather than borrowed from Hardin County.
What Grows in Rosiclare
Every plant below cleared Rosiclare's own zone 7a and its 225-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Rosiclare?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Feb 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 7 — 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 Rosiclare
Survey cells within 31 miles of Rosiclare checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 128 miles off. What to watch for.
What's on the federal record near Rosiclare
Closest first, within ~10 miles of Rosiclare. Listing isn't leaking, and distance isn't exposure.
- Blue Diggings-Mine and FaultMining · 250 ft
- Argo-Argo FaultMining · 500 ft
- Rosiclare MineMining · 1200 ft
- Russell Oil Co.Underground Storage Tanks · 2100 ft
- No. 4 Shaft-Good Hope FaultMining · 2100 ft
- 12S 8E-32.3a2Nitrate · 2400 ft
- Empire Dock CoUnderground Storage Tanks · 2600 ft
- American Minerals IncUnderground Storage Tanks · 2600 ft
- Hall's Automotive ServiceUnderground Storage Tanks · 2600 ft
- Rosiclare Fluorspar - Lead - Zinc DistrictMining · 0.5 mi
- Fairview-Blue Diggings FaultMining · 0.6 mi
- Illinois - Kentucky Fluorite DistrictMining · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rosiclare'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 Rosiclare.
Total Sites
110
within ~10 miles of Rosiclare
Risk Level
High
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Rosiclare
Severity Distribution
within ~10 miles of Rosiclare
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rosiclare, Mining runs higher than the national average — 55 sites within ~10 miles of Rosiclare. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Rosiclare
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 Rosiclare average
Your land is one point inside Rosiclare
Everything above resolves to Rosiclare as a whole — one PHZM band and one 28°F frost record, read across 1K 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 city 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 Rosiclare Average
Rosiclare Average
- ●USDA Zones 7a, averaged across Rosiclare
- ●One soil character for all of Rosiclare
- ●Frost dates read at Rosiclare's scale: Mar 27 to Nov 7
YOUR Parcel
- ✓Your exact zone, not Rosiclare's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rosiclare
Pull a site-specific report for your exact address in Rosiclare, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rosiclare averages can't show:
We read public map data around Rosiclare — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rosiclare average
How we know this about Rosiclare
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Rosiclare’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 city grain anywhere on this page — there is no city-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 Rosiclare
When does frost risk typically end in Rosiclare?
The last hard freeze (28°F) in Rosiclare typically lands around Mar 27, 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 17.
When is the first frost in Rosiclare?
The first hard freeze (28°F) in Rosiclare typically arrives around Nov 7, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 24, so the watching starts about Oct 8 — about 225 days after the spring freeze cleared.
How long is the growing season in Rosiclare?
Measured between 28°F hard freezes, Rosiclare sees about 225 frost-free days — roughly Mar 27 through Nov 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 17 to Oct 24, about 190 days.
Is the soil safe to grow vegetables in Rosiclare?
The federal record around Rosiclare runs heavier than most — 110 documented sites, mostly Mining entries (55), the nearest Mining record under a tenth of a mile 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 Rosiclare?
From about Oct 8 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 7 (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 7. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rosiclare's scale — its 7a band and its 225-day season. Your yard writes its own version of Rosiclare'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 Rosiclare’s own scale
7 of the readings below were taken at Rosiclare's own scale — its own ~225-day season between 28°F freezes, the 1,241 acres it covers and 110 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rosiclare's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Rosiclare's own 28°F hard-freeze dates, about Mar 27 and Nov 7 and the ~225-day span between themNOAA 1991–2020 Climate Normals
- 110 documented contamination sites on the federal record near Rosiclare, the closest Mining record under a tenth of a mile out from the town centreFederal environmental registers
- Rosiclare's boundary and the 1,241 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~225-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rosiclare's own centroid, the Interior PlateauUS EPA Level III Ecoregions
- Lanternfly survey cells around Rosiclare checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rosiclare's 1,241 acres read through its county's SSURGO summaryfrom Hardin County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Hardin 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 Hardin County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rosiclare's 1,241 acreswhy one lot differs from the next →
- Which side of Rosiclare you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,241 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Mining 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 Rosiclare-wide figureread your own land →