Lake Seneca, Ohio, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Expect cabbage, hazelnut, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Lake Seneca, 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 Lake Seneca 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 Lake Seneca — soil, climate, flood, and parcel records. How we handle your address.
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Lake Seneca — the short answer
Lake Seneca, Ohio: USDA zone 6a, about 193 days between hard freezes, across 909 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~193
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 909 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 Lake Seneca's average, not your lot's — a low corner or a tree line moves it. Against Lake Seneca's 193-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Lake Seneca
Each reading below is measured for Lake Seneca itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredLake Seneca runs about 193 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
MeasuredLake Seneca 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 Lake Seneca is in
Lake Seneca sits in the Eastern Corn Belt Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Lake Seneca's own centroid rather than borrowed from Williams County.
What Grows in Lake Seneca
Every plant below cleared Lake Seneca's own zone 6a and its 193-day season. Each card opens that plant's Ohio profile. How we score.
Is it too late to plant in Lake Seneca?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 26 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
Documented around Lake Seneca
Survey cells within 31 miles of Lake Seneca checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 49 miles off. What to watch for.
What's on the federal record near Lake Seneca
Closest first, within ~10 miles of Lake Seneca. Listing isn't leaking, and distance isn't exposure.
- BRIGHTMARK BRIDGEWATER RNG LLCBrownfields · 2.3 mi
- C AND R RECYCLERSBrownfields · 2.4 mi
- SUS171-5Nitrate · 2.4 mi
- AG171-5Nitrate · 2.9 mi
- Lake Diane Shore Side Plaza IncUnderground Storage Tanks · 3.0 mi
- SUS171-4Nitrate · 3.8 mi
- AG171-4Nitrate · 3.8 mi
- RAYMONDS TOOL AND GAUGEBrownfields · 3.8 mi
- HOLIDAY CITY STOP N GOUnderground Storage Tanks · 4.0 mi
- CHASE BRASS & COPPER CO., INC.Underground Storage Tanks · 4.0 mi
- SLATTERY OIL CO. INC.Underground Storage Tanks · 4.0 mi
- TRANSPORT AMERICAUnderground Storage Tanks · 4.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Lake Seneca'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 Lake Seneca.
Total Sites
136
within ~10 miles of Lake Seneca
Risk Level
Moderate
Highest-severity
15 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Lake Seneca
Severity Distribution
within ~10 miles of Lake Seneca
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Lake Seneca, Toxics Release Inventory runs higher than the national average — 15 sites within ~10 miles of Lake Seneca. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Lake Seneca
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 Lake Seneca average
Your land is one point inside Lake Seneca
Everything above resolves to Lake Seneca as a whole — one PHZM band and one 28°F frost record, read across 909 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 Lake Seneca Average
Lake Seneca Average
- ●USDA Zones 6a, averaged across Lake Seneca
- ●One soil character for all of Lake Seneca
- ●Frost dates read at Lake Seneca's scale: Apr 16 to Oct 26
YOUR Parcel
- ✓Your exact zone, not Lake Seneca's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Lake Seneca
Pull a site-specific report for your exact address in Lake Seneca, Ohio — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Lake Seneca averages can't show:
We read public map data around Lake Seneca — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Lake Seneca average
How we know this about Lake Seneca
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 Lake Seneca’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 Lake Seneca
When does frost risk typically end in Lake Seneca?
The last hard freeze (28°F) in Lake Seneca typically lands around Apr 16, 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 7.
When is the first frost in Lake Seneca?
The first hard freeze (28°F) in Lake Seneca typically arrives around Oct 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 12, so the watching starts about Sep 26 — about 193 days after the spring freeze cleared.
How long is the growing season in Lake Seneca?
Measured between 28°F hard freezes, Lake Seneca sees about 193 frost-free days — roughly Apr 16 through Oct 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 7 to Oct 12, about 158 days.
Is the soil safe to grow vegetables in Lake Seneca?
The federal record around Lake Seneca shows 136 documented sites, mostly Underground Storage Tanks entries (53), the nearest Brownfields record about 2.3 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 Lake Seneca?
From about Sep 26 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 26 (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 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Lake Seneca's scale — its 6a band and its 193-day season. Your yard writes its own version of Lake Seneca'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 Lake Seneca’s own scale
7 of the readings below were taken at Lake Seneca's own scale — its own ~193-day season between 28°F freezes, the 909 acres it covers and 136 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Lake Seneca's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Lake Seneca's own 28°F hard-freeze dates, about Apr 16 and Oct 26 and the ~193-day span between themNOAA 1991–2020 Climate Normals
- 136 documented contamination sites on the federal record near Lake Seneca, the closest Brownfields record about 2.3 miles out from the town centreFederal environmental registers
- Lake Seneca's boundary and the 909 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~193-day seasonGrowable Ground crop-matching engine
- The ecoregion at Lake Seneca's own centroid, the Eastern Corn Belt PlainsUS EPA Level III Ecoregions
- Lanternfly survey cells around Lake Seneca 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 Lake Seneca's 909 acres read through its county's SSURGO summaryfrom Williams County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Williams 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 Williams County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Lake Seneca's 909 acreswhy one lot differs from the next →
- Which side of Lake Seneca you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 909 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 2.3 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 Lake Seneca-wide figureread your own land →
More in Ohio
Wider growing context
What grows across OhioLake Seneca sits outside our named growing regions, so Ohio as a whole is its closest context here.
Nearby growing guides