Florence, 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.
Reliable performers under these conditions include cabbage, hazelnut, lavender, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Florence, 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 Florence 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 Florence — soil, climate, flood, and parcel records. How we handle your address.
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Florence — the short answer
Florence, Illinois: USDA zone 6a, about 219 days between hard freezes, across 177 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~219
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 177 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 Florence's average, not your lot's — a low corner or a tree line moves it. Against Florence's 219-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Florence
Each reading below is measured for Florence itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredFlorence runs about 219 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
MeasuredFlorence 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 Florence is in
Florence sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Florence's own centroid rather than borrowed from Pike County.
What Grows in Florence
Every plant below cleared Florence's own zone 6a and its 219-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Florence?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 4 — 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.
What's on the federal record near Florence
Closest first, within ~10 miles of Florence. Listing isn't leaking, and distance isn't exposure.
- CARGILL INCBrownfields · 2100 ft
- IL-106 and IL-100Nitrate · 2.9 mi
- Detroit Township OfUnderground Storage Tanks · 3.4 mi
- Chester S. Wilcox/Vivian EisenbacherUnderground Storage Tanks · 3.4 mi
- Stilwell Truck SerUnderground Storage Tanks · 3.6 mi
- John's SunocoUnderground Storage Tanks · 4.9 mi
- Logan Agri Service, Inc.Underground Storage Tanks · 4.9 mi
- Denisons Standard Service (East Side)Underground Storage Tanks · 4.9 mi
- Denisons Standard Service (West Side)Underground Storage Tanks · 4.9 mi
- MiltonUnderground Storage Tanks · 4.9 mi
- BRUSH COLLEGE FINISHERSCAFO · 5.4 mi
- Callender Construction Co IncUnderground Storage Tanks · 5.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Florence'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 Florence.
Total Sites
78
within ~10 miles of Florence
Risk Level
Moderate
Highest-severity
4 concentrated animal feeding operations
Sources Checked
within ~10 miles of Florence
Severity Distribution
within ~10 miles of Florence
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Florence, two things run higher than the national average within ~10 miles of Florence — PFAS (4 sites) and CAFO (4 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Florence
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 Florence average
Your land is one point inside Florence
Everything above resolves to Florence as a whole — one PHZM band and one 28°F frost record, read across 177 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 Florence Average
Florence Average
- ●USDA Zones 6a, averaged across Florence
- ●One soil character for all of Florence
- ●Frost dates read at Florence's scale: Mar 30 to Nov 4
YOUR Parcel
- ✓Your exact zone, not Florence's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Florence
Pull a site-specific report for your exact address in Florence, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Florence averages can't show:
We read public map data around Florence — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Florence average
How we know this about Florence
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 Florence’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 Florence
When does frost risk typically end in Florence?
The last hard freeze (28°F) in Florence typically lands around Mar 30, 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 20.
When is the first frost in Florence?
The first hard freeze (28°F) in Florence typically arrives around Nov 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 21, so the watching starts about Oct 5 — about 219 days after the spring freeze cleared.
How long is the growing season in Florence?
Measured between 28°F hard freezes, Florence sees about 219 frost-free days — roughly Mar 30 through Nov 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 20 to Oct 21, about 184 days.
Is the soil safe to grow vegetables in Florence?
The federal record around Florence shows 78 documented sites, mostly Underground Storage Tanks entries (54), the nearest Brownfields record about 0.4 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Florence?
From about Oct 5 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 4 (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 4. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Florence's scale — its 6a band and its 219-day season. Your yard writes its own version of Florence'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 Florence’s own scale
6 of the readings below were taken at Florence's own scale — its own ~219-day season between 28°F freezes, the 177 acres it covers and 78 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Florence's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Florence's own 28°F hard-freeze dates, about Mar 30 and Nov 4 and the ~219-day span between themNOAA 1991–2020 Climate Normals
- 78 documented contamination sites on the federal record near Florence, the closest Brownfields record about 0.4 miles out from the town centreFederal environmental registers
- Florence's boundary and the 177 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~219-day seasonGrowable Ground crop-matching engine
- The ecoregion at Florence'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 Florence's 177 acres read through its county's SSURGO summaryfrom Pike County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Pike 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 Pike County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Florence's 177 acreswhy one lot differs from the next →
- Which side of Florence you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 177 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.4 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 Florence-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisFlorence sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides