Cassville, Wisconsin, sits in USDA hardiness zone 5a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Well-matched crops include cabbage, cranberry, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Cassville, 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 Cassville 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 Cassville — soil, climate, flood, and parcel records. How we handle your address.
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Cassville — the short answer
Cassville, Wisconsin: USDA zone 5a, about 201 days between hard freezes, across 665 acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 8
- 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
- ~201
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 665 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 Cassville's average, not your lot's — a low corner or a tree line moves it. Against Cassville's 201-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Cassville
Each reading below is measured for Cassville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCassville runs about 201 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
MeasuredCassville 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 Cassville is in
Cassville sits in the Driftless Area — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Cassville's own centroid rather than borrowed from Grant County.
What Grows in Cassville
Every plant below cleared Cassville's own zone 5a and its 201-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Cassville?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 11; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 8 (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. 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.
What's on the federal record near Cassville
Closest first, within ~10 miles of Cassville. Listing isn't leaking, and distance isn't exposure.
- GR-03/05W/20-0098Nitrate · 350 ft
- HASKINS AMOCO STATIONUnderground Storage Tanks · 400 ft
- Bp Amoco Of CassvilleUnderground Storage Tanks · 400 ft
- ADRIAN OIL CO INCUnderground Storage Tanks · 450 ft
- Kelleys Service StationUnderground Storage Tanks · 600 ft
- RAPID DIE AND MOLDINGToxics Release Inventory · 900 ft
- GR-03/05W/29-0032Nitrate · 1100 ft
- CASSVILLE FIRE DEPARTMENTUnderground Storage Tanks · 1100 ft
- Alice C BuddUnderground Storage Tanks · 1600 ft
- CASSVILLE COUNTY SHOPUnderground Storage Tanks · 1600 ft
- BSNF RAILWAY CASSVILLE WIBrownfields · 1800 ft
- GREAT RIVER ROAD STOP & GOUnderground Storage Tanks · 2100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Cassville'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 Cassville.
Total Sites
151
within ~10 miles of Cassville
Risk Level
High
Highest-severity
4 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Cassville
Severity Distribution
within ~10 miles of Cassville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Cassville, Mining runs higher than the national average — 16 sites within ~10 miles of Cassville. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Cassville
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 Cassville average
Your land is one point inside Cassville
Everything above resolves to Cassville as a whole — one PHZM band and one 28°F frost record, read across 665 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 Cassville Average
Cassville Average
- ●USDA Zones 5a, averaged across Cassville
- ●One soil character for all of Cassville
- ●Frost dates read at Cassville's scale: Apr 8 to Oct 26
YOUR Parcel
- ✓Your exact zone, not Cassville's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Cassville
Pull a site-specific report for your exact address in Cassville, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Cassville averages can't show:
We read public map data around Cassville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Cassville average
How we know this about Cassville
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 Cassville’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 Cassville
When does frost risk typically end in Cassville?
The last hard freeze (28°F) in Cassville typically lands around Apr 8, 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 29.
When is the first frost in Cassville?
The first hard freeze (28°F) in Cassville 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 201 days after the spring freeze cleared.
How long is the growing season in Cassville?
Measured between 28°F hard freezes, Cassville sees about 201 frost-free days — roughly Apr 8 through Oct 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 29 to Oct 12, about 166 days.
Is the soil safe to grow vegetables in Cassville?
The federal record around Cassville runs heavier than most — 151 documented sites, mostly Underground Storage Tanks entries (92), the nearest Nitrate record under a tenth of a mile 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 Cassville?
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 Cassville's scale — its 5a band and its 201-day season. Your yard writes its own version of Cassville'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 Cassville’s own scale
6 of the readings below were taken at Cassville's own scale — its own ~201-day season between 28°F freezes, the 665 acres it covers and 151 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Cassville's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Cassville's own 28°F hard-freeze dates, about Apr 8 and Oct 26 and the ~201-day span between themNOAA 1991–2020 Climate Normals
- 151 documented contamination sites on the federal record near Cassville, the closest Nitrate record under a tenth of a mile out from the town centreFederal environmental registers
- Cassville's boundary and the 665 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~201-day seasonGrowable Ground crop-matching engine
- The ecoregion at Cassville's own centroid, the Driftless AreaUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Cassville's 665 acres read through its county's SSURGO summaryfrom Grant County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Grant 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 Grant County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Cassville's 665 acreswhy one lot differs from the next →
- Which side of Cassville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 665 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record under a tenth of a mile 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 Cassville-wide figureread your own land →
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