Seymour, Wisconsin, sits in USDA hardiness zone 5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Expect cabbage, cranberry, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Seymour, 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 Seymour 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 Seymour — soil, climate, flood, and parcel records. How we handle your address.
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Seymour — the short answer
Seymour, Wisconsin: USDA zone 5a, about 181 days between hard freezes, across 2K acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~181
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 2K 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 5a is Seymour's average, not your lot's — a low corner or a tree line moves it. Against Seymour's 181-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Seymour
Each reading below is measured for Seymour itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSeymour runs about 181 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
MeasuredSeymour sits in USDA hardiness zone 5a.
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 Seymour is in
Seymour sits in the North Central Hardwood Forests — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Seymour's own centroid rather than borrowed from Outagamie County.
What Grows in Seymour
Every plant below cleared Seymour's own zone 5a and its 181-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Seymour?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Mar 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 20 — 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.
What's on the federal record near Seymour
Closest first, within ~10 miles of Seymour. Listing isn't leaking, and distance isn't exposure.
- CLAUDE PEATTERUnderground Storage Tanks · 550 ft
- HARVEY ALBERT JRUnderground Storage Tanks · 550 ft
- PETER VER VOORTUnderground Storage Tanks · 550 ft
- Dave SchuhUnderground Storage Tanks · 550 ft
- OSBOURNE MICROWAVEUnderground Storage Tanks · 550 ft
- TESCH BROS IMP INCUnderground Storage Tanks · 550 ft
- CARLTON WERNERUnderground Storage Tanks · 550 ft
- John JonesUnderground Storage Tanks · 550 ft
- RYNISHS SMALL ENGINEUnderground Storage Tanks · 550 ft
- NICHOLS CO OP ASSOCUnderground Storage Tanks · 550 ft
- RYNISHS TIRE & SMALL ENGINEUnderground Storage Tanks · 550 ft
- NORBERT MASTEYUnderground Storage Tanks · 550 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Seymour'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 Seymour.
Total Sites
271
within ~10 miles of Seymour
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Seymour
Severity Distribution
within ~10 miles of Seymour
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Seymour, two things run higher than the national average within ~10 miles of Seymour — CAFO (6 sites) and Underground Storage Tanks (179 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Seymour
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 Seymour average
Your land is one point inside Seymour
Everything above resolves to Seymour as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Seymour Average
Seymour Average
- ●USDA Zones 5a, averaged across Seymour
- ●One soil character for all of Seymour
- ●Frost dates read at Seymour's scale: Apr 22 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Seymour's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Seymour
Pull a site-specific report for your exact address in Seymour, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Seymour averages can't show:
We read public map data around Seymour — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Seymour average
How we know this about Seymour
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 Seymour’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 Seymour
When does frost risk typically end in Seymour?
The last hard freeze (28°F) in Seymour typically lands around Apr 22, 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 13.
When is the first frost in Seymour?
The first hard freeze (28°F) in Seymour typically arrives around Oct 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 6, so the watching starts about Sep 20 — about 181 days after the spring freeze cleared.
How long is the growing season in Seymour?
Measured between 28°F hard freezes, Seymour sees about 181 frost-free days — roughly Apr 22 through Oct 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 13 to Oct 6, about 146 days.
Is the soil safe to grow vegetables in Seymour?
The federal record around Seymour is a meaningful one — 271 documented sites, mostly Underground Storage Tanks entries (179), the nearest Underground Storage Tanks record about 0.1 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.
How do I protect my plants from frost in Seymour?
From about Sep 20 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 20 (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 20. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Seymour's scale — its 5a band and its 181-day season. Your yard writes its own version of Seymour'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 Seymour’s own scale
6 of the readings below were taken at Seymour's own scale — its own ~181-day season between 28°F freezes, the 1,786 acres it covers and 271 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Seymour's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Seymour's own 28°F hard-freeze dates, about Apr 22 and Oct 20 and the ~181-day span between themNOAA 1991–2020 Climate Normals
- 271 documented contamination sites on the federal record near Seymour, the closest Underground Storage Tanks record about 0.1 miles out from the town centreFederal environmental registers
- Seymour's boundary and the 1,786 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~181-day seasonGrowable Ground crop-matching engine
- The ecoregion at Seymour's own centroid, the North Central Hardwood ForestsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Seymour's 1,786 acres read through its county's SSURGO summaryfrom Outagamie County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Outagamie County
- The growing challenges every Wisconsin grower plans around — written at state scale, so they stay on the state guidefrom Wisconsin
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Outagamie County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Seymour's 1,786 acreswhy one lot differs from the next →
- Which side of Seymour you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,786 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 Seymour-wide figureread your own land →
More in Wisconsin
Wider growing context
What grows across WisconsinSeymour sits outside our named growing regions, so Wisconsin as a whole is its closest context here.
Nearby growing guides