Trenton, Illinois, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Trenton, 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 Trenton 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 Trenton — soil, climate, flood, and parcel records. How we handle your address.
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Trenton — the short answer
Trenton, Illinois: USDA zone 6b, about 226 days between hard freezes, across 1K acres of city.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~226
- 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 6b is Trenton's average, not your lot's — a low corner or a tree line moves it. Against Trenton's 226-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Trenton
Each reading below is measured for Trenton itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredTrenton runs about 226 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
MeasuredTrenton sits in USDA hardiness zone 6b.
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 Trenton is in
Trenton sits in the Interior River Valleys and Hills — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Trenton's own centroid rather than borrowed from Clinton County.
What Grows in Trenton
Every plant below cleared Trenton's own zone 6b and its 226-day season. Each card opens that plant's Illinois profile. How we score.
Is it too late to plant in Trenton?
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 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 6 — 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 Trenton
Survey cells within 31 miles of Trenton checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 229 miles off. What to watch for.
What's on the federal record near Trenton
Closest first, within ~10 miles of Trenton. Listing isn't leaking, and distance isn't exposure.
- DEIEN CHEVROLET GEOBrownfields · 900 ft
- Fritz Richard WUnderground Storage Tanks · 1000 ft
- Casey's General StoreUnderground Storage Tanks · 1100 ft
- Kountry Store, Inc.Underground Storage Tanks · 1100 ft
- CC Food MartUnderground Storage Tanks · 1300 ft
- City of Trenton Maintenance BuildingUnderground Storage Tanks · 1300 ft
- TRENTON CLEANERS AND LAUNDRYBrownfields · 1400 ft
- Town & Country Furn/Carpet WorldUnderground Storage Tanks · 1800 ft
- Wesclin Jr/Sr HsUnderground Storage Tanks · 1900 ft
- Township of Sugar CreekUnderground Storage Tanks · 2100 ft
- Agri Pride FS IncUnderground Storage Tanks · 2200 ft
- C & J AutomotiveUnderground Storage Tanks · 2300 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Trenton'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 Trenton.
Total Sites
264
within ~10 miles of Trenton
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Trenton
Severity Distribution
within ~10 miles of Trenton
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Trenton, two things run higher than the national average within ~10 miles of Trenton — CAFO (21 sites) and PFAS (3 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Trenton
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 Trenton average
Your land is one point inside Trenton
Everything above resolves to Trenton 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 Trenton Average
Trenton Average
- ●USDA Zones 6b, averaged across Trenton
- ●One soil character for all of Trenton
- ●Frost dates read at Trenton's scale: Mar 25 to Nov 6
YOUR Parcel
- ✓Your exact zone, not Trenton's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Trenton
Pull a site-specific report for your exact address in Trenton, Illinois — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Trenton averages can't show:
We read public map data around Trenton — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Trenton average
How we know this about Trenton
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 Trenton’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 Trenton
When does frost risk typically end in Trenton?
The last hard freeze (28°F) in Trenton typically lands around Mar 25, 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 15.
When is the first frost in Trenton?
The first hard freeze (28°F) in Trenton typically arrives around Nov 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 23, so the watching starts about Oct 7 — about 226 days after the spring freeze cleared.
How long is the growing season in Trenton?
Measured between 28°F hard freezes, Trenton sees about 226 frost-free days — roughly Mar 25 through Nov 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 15 to Oct 23, about 191 days.
Is the soil safe to grow vegetables in Trenton?
The federal record around Trenton is a meaningful one — 264 documented sites, mostly Underground Storage Tanks entries (163), 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 Trenton?
From about Oct 7 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 6 (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 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Trenton's scale — its 6b band and its 226-day season. Your yard writes its own version of Trenton'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 Trenton’s own scale
7 of the readings below were taken at Trenton's own scale — its own ~226-day season between 28°F freezes, the 1,205 acres it covers and 264 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Trenton's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Trenton's own 28°F hard-freeze dates, about Mar 25 and Nov 6 and the ~226-day span between themNOAA 1991–2020 Climate Normals
- 264 documented contamination sites on the federal record near Trenton, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Trenton's boundary and the 1,205 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~226-day seasonGrowable Ground crop-matching engine
- The ecoregion at Trenton's own centroid, the Interior River Valleys and HillsUS EPA Level III Ecoregions
- Lanternfly survey cells around Trenton 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 Trenton's 1,205 acres read through its county's SSURGO summaryfrom Clinton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Clinton 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 Clinton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Trenton's 1,205 acreswhy one lot differs from the next →
- Which side of Trenton you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,205 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 Trenton-wide figureread your own land →
More in Illinois
Wider growing context
What grows across IllinoisTrenton sits outside our named growing regions, so Illinois as a whole is its closest context here.
Nearby growing guides