Warren, Ohio, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Warren, 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 Warren 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 Warren — soil, climate, flood, and parcel records. How we handle your address.
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Warren — the short answer
Warren, Ohio: USDA zone 6a, about 192 days between hard freezes, across 10K acres of city.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~192
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 10K 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 Warren's average, not your lot's — a low corner or a tree line moves it. Against Warren's 192-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Warren
Each reading below is measured for Warren itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWarren runs about 192 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredWarren 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 Warren is in
Warren sits in the Erie Drift Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Warren's own centroid rather than borrowed from Trumbull County.
What Grows in Warren
Every plant below cleared Warren's own zone 6a and its 192-day season. Each card opens that plant's Ohio profile. How we score.
Is it too late to plant in Warren?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 21 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 30 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
Documented around Warren
Spotted lanternfly documented 5 miles from Warren, first recorded 2022. What to watch for.
What's on the federal record near Warren
Closest first, within ~10 miles of Warren. Listing isn't leaking, and distance isn't exposure.
- UNITED STATES POSTAL SERVICEUnderground Storage Tanks · 700 ft
- EXPERT TIREBrownfields · 900 ft
- T & Z TIRE WHOLESALERS, INC.Underground Storage Tanks · 900 ft
- FRANK & JIM'S SERVICE CENTERUnderground Storage Tanks · 1200 ft
- WARREN CITY SCHOOL DISTRICTUnderground Storage Tanks · 1400 ft
- SOCIETY CLEANERS & TAILORSBrownfields · 1400 ft
- BONDED #1136Underground Storage Tanks · 1500 ft
- FAMILY DOLLAR #7288Brownfields · 1500 ft
- TRIBUNE CHRONICLEBrownfields · 1700 ft
- WARREN NEWSPAPERS, INC.Underground Storage Tanks · 1700 ft
- MUNICIPAL BUILDINGUnderground Storage Tanks · 1800 ft
- FORMER HOOD OIL CO.Underground Storage Tanks · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Warren'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 Warren.
Total Sites
820
within ~10 miles of Warren
Risk Level
High
Highest-severity
7 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Warren
Severity Distribution
within ~10 miles of Warren
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Warren, two things run higher than the national average within ~10 miles of Warren — PFAS (12 sites) and Toxics Release Inventory (77 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Warren
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 Warren average
Your land is one point inside Warren
Everything above resolves to Warren as a whole — one PHZM band and one 28°F frost record, read across 10K 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 Warren Average
Warren Average
- ●USDA Zones 6a, averaged across Warren
- ●One soil character for all of Warren
- ●Frost dates read at Warren's scale: Apr 21 to Oct 30
YOUR Parcel
- ✓Your exact zone, not Warren's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Warren
Pull a site-specific report for your exact address in Warren, Ohio — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Warren averages can't show:
We read public map data around Warren — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Warren average
How we know this about Warren
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 Warren’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 Warren
When does frost risk typically end in Warren?
The last hard freeze (28°F) in Warren typically lands around Apr 21, 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 May 12.
When is the first frost in Warren?
The first hard freeze (28°F) in Warren typically arrives around Oct 30, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 16, so the watching starts about Sep 30 — about 192 days after the spring freeze cleared.
How long is the growing season in Warren?
Measured between 28°F hard freezes, Warren sees about 192 frost-free days — roughly Apr 21 through Oct 30, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 12 to Oct 16, about 157 days.
Is the soil safe to grow vegetables in Warren?
The federal record around Warren runs heavier than most — 820 documented sites, mostly Underground Storage Tanks entries (440), the nearest Underground Storage Tanks record about 0.1 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 Warren?
From about Sep 30 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 30 (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 30. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Warren's scale — its 6a band and its 192-day season. Your yard writes its own version of Warren'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 Warren’s own scale
7 of the readings below were taken at Warren's own scale — its own ~192-day season between 28°F freezes, the 10,212 acres it covers and 820 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Warren's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Warren's own 28°F hard-freeze dates, about Apr 21 and Oct 30 and the ~192-day span between themNOAA 1991–2020 Climate Normals
- 820 documented contamination sites on the federal record near Warren, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Warren's boundary and the 10,212 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~192-day seasonGrowable Ground crop-matching engine
- The ecoregion at Warren's own centroid, the Erie Drift PlainUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Warrenlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Warren's 10,212 acres read through its county's SSURGO summaryfrom Trumbull County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Trumbull County
- The growing challenges every Ohio grower plans around — written at state scale, so they stay on the state guidefrom Ohio
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Trumbull County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Warren's 10,212 acreswhy one lot differs from the next →
- Which side of Warren you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,212 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.1 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 Warren-wide figureread your own land →