Seneca County, in New York, sits in USDA hardiness zone 6b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, cabbage, hazelnut, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Seneca County lies within the Finger Lakes — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Seneca County holds more than one microclimate.
Soils and elevations shift across Seneca County, so your frost dates and drainage aren't the county average. 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 Seneca County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Seneca County — the short answer
Seneca County, New York: USDA zone 6b, about 213 days between hard freezes, across 207K acres.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 10
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Nov 9
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~213
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 207K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 Seneca County's average, not your lot's — a low corner or a tree line moves it. Against Seneca County's 213-day season, see what your own ground reads.
Heat in Seneca County
Across a year, Seneca County accumulates about 2,461 growing degree days above 50°F, about 225 more than the middle New York county — ahead of 45 of New York’s 62 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Seneca County
Across Seneca County, the ground is predominantly Alfisols, where Darien, Cazenovia, and Schoharie are the most extensive named soil series. The soil is generally moderately well drained with a silt loam surface. Topsoil pH runs about 6.2–6.7, slightly acidic. Rainfall drains through hydrologic group C/D soils.
Soil order
Alfisols
Drainage
Moderately well drained
Prime farmland
36%
Hydric soils
15%
Soil still varies lot by lot — soil types explained.
How the ground varies across Seneca County
The USDA soil survey maps 32% of Seneca County as moderately well drained — but another 46% drains differently: 21% somewhat poorly drained, 14% well drained.
Darien is the most extensive named soil at 9% of mapped acres, then Cazenovia (8%) and Schoharie (7%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Seneca County
Each reading below is measured for Seneca County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Seneca County are moderately well drained, in hydrologic group C/D — roughly the middle of the drainage range.
This is close to the middle most vegetables prefer: it holds enough water to carry a crop between rains without staying waterlogged. The catch is that a wet spring or a low corner can still tip it soggy.
Plant on the site as-is for most crops, but keep the lowest, slowest-draining beds for moisture-tolerant plantings.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Seneca County runs about pH 6.2–6.7, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Season length
MeasuredSeneca County runs about 213 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
MeasuredSeneca County 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 Seneca County is in
Seneca County spans 2 EPA Level III ecoregions — Eastern Great Lakes Lowlands (81%) and Northern Allegheny Plateau (19%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Seneca County
We scored all 1,086 plants against Seneca County's own USDA zone 6b and its own 213-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's New York profile.
Is it too late to plant in Seneca County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 13; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 10 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 9 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Seneca County
Spotted lanternfly documented 6 miles from Seneca County, first recorded 2022. What to watch for.
- Japanese beetle5 documented records
- monarch butterfly6 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Seneca County
USGS estimates 49,233 lb of Glyphosate on Seneca County farmland in 2019, its largest by weight, ahead of Atrazine (23,181 lb) and Metolachlor & Metolachlor-s (13,262 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Seneca County — and how to grow with it.
We checked the federal record across Seneca County — 295 documented sites across 7 of the 9 source types we track.
The most significant on record: 5 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Seneca County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Seneca County
Closest first, across Seneca County. Listing isn't leaking, and distance isn't exposure.
- LAMAR L MARTIN FARMCAFO · 1.1 mi
- TOWN OF VARICKUnderground Storage Tanks · 1.1 mi
- LAMAR MARTINCAFO · 1.1 mi
- LARRY W. MARTINCAFO · 1.8 mi
- LARRY MARTINCAFO · 1.8 mi
- SE 67Nitrate · 2.1 mi
- NEWHART MINI MARTUnderground Storage Tanks · 2.1 mi
- SENECA COUNTYUnderground Storage Tanks · 2.1 mi
- FIVE POINTS CORRECTIONAL FACILITYBrownfields · 2.1 mi
- SE 128Nitrate · 2.2 mi
- COVERT FARMSUnderground Storage Tanks · 2.3 mi
- ROMULUS CENTRAL SCHOOLUnderground Storage Tanks · 2.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Seneca County'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 Seneca County.
Sources Checked
across Seneca County
Severity Distribution
across Seneca County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Seneca County, two things run higher than the national average across Seneca County — CAFO (24 sites) and Superfund (5 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.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Seneca County
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 Seneca County average
Your land is one point inside Seneca County
Everything above resolves to Seneca County as a whole — one PHZM band and one county frost record, read across 207K 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 county 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 county average.
Your Lot vs the Seneca County Average
Seneca County Average
- ●USDA Zones 6b, averaged across Seneca County
- ●One soil character for all of Seneca County
- ●Frost dates read at Seneca County's scale: Apr 10 to Nov 9
YOUR Parcel
- ✓Your exact zone, not Seneca County's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Seneca County
Pull a site-specific report for your exact address in Seneca County, New York — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Seneca County averages can't show:
We read public map data around Seneca County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Seneca County average
How we know this about Seneca County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Seneca County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Seneca County
When does frost risk typically end in Seneca County?
The last hard freeze (28°F) in Seneca County typically lands around Apr 10, 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 1.
How long is the growing season in Seneca County?
Measured between 28°F hard freezes, Seneca County sees about 213 frost-free days — roughly Apr 10 through Nov 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 1 to Oct 26, about 178 days.
Is the soil safe to grow vegetables in Seneca County?
The federal record around Seneca County is a meaningful one — 295 documented sites, mostly Underground Storage Tanks entries (146), the nearest CAFO record about 1.1 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.
Everything above is measured at Seneca County's scale — its 6b band and its 213-day season. Your yard writes its own version of Seneca County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads New York's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Seneca County’s own scale
9 of the readings below were taken at Seneca County's own scale — its own ~213-day span between 28°F freezes, the 3 most extensive soil series mapped here and 295 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Seneca County's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Seneca County's own 28°F hard-freeze dates and its ~213-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Seneca CountyUSDA NRCS SSURGO
- 295 documented contamination sites inside the county boundary, distance-sorted from its center — the closest CAFO record about 1.1 miles outFederal environmental registers
- Seneca County's boundary and the 207,167 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~213-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Seneca County spans, Eastern Great Lakes Lowlands the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Seneca County for 2 tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Seneca County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every New York grower plans around — written at state scale, so they stay on the state guidefrom New York
What this page can’t tell you
- How the season shifts across Seneca County — the ~213 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Seneca County's 207,167 acreswhy one lot differs from the next →
- Which of those 295 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Seneca Countyread your own land →