Unity, Wisconsin, sits in USDA hardiness zone 4b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Growers here do well with cabbage, cranberry, turkish rocket, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Unity, 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 Unity 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 Unity — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Unity — the short answer
Unity, Wisconsin: USDA zone 4b, about 172 days between hard freezes, across 634 acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 13
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~172
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 634 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 4b is Unity's average, not your lot's — a low corner or a tree line moves it. Against Unity's 172-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Unity
Each reading below is measured for Unity itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredUnity runs about 172 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
MeasuredUnity sits in USDA hardiness zone 4b.
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 Unity is in
Unity sits in the North Central Hardwood Forests — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Unity's own centroid rather than borrowed from Marathon County.
What Grows in Unity
Every plant below cleared Unity's own zone 4b and its 172-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Unity?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 27; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 13 — 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.
What's on the federal record near Unity
Closest first, within ~10 miles of Unity. Listing isn't leaking, and distance isn't exposure.
- UNITY AUTO MARTSuperfund · 650 ft
- FORMER UNITY AUTO MARTBrownfields · 700 ft
- Unity C-Store LLCUnderground Storage Tanks · 800 ft
- UNITY DAIRYUnderground Storage Tanks · 800 ft
- BLUE MOON TAVERNUnderground Storage Tanks · 850 ft
- DALLMANN PLASTICS INCBrownfields · 2100 ft
- FRANE BODY SHOPBrownfields · 0.9 mi
- R & R AUTOUnderground Storage Tanks · 1.2 mi
- JOHNSON GARAGEBrownfields · 2.4 mi
- Town Of BrightonUnderground Storage Tanks · 2.7 mi
- LYNN ENTERPRISESCAFO · 2.7 mi
- TOWN OF UNITYUnderground Storage Tanks · 2.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Unity'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 Unity.
Sources Checked
within ~10 miles of Unity
Severity Distribution
within ~10 miles of Unity
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Unity, two things run higher than the national average within ~10 miles of Unity — CAFO (5 sites) and Superfund (3 sites). That's not a problem with your land — it's information about it.
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 Unity
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 Unity average
Your land is one point inside Unity
Everything above resolves to Unity as a whole — one PHZM band and one 28°F frost record, read across 634 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 Unity Average
Unity Average
- ●USDA Zones 4b, averaged across Unity
- ●One soil character for all of Unity
- ●Frost dates read at Unity's scale: Apr 24 to Oct 13
YOUR Parcel
- ✓Your exact zone, not Unity's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Unity
Pull a site-specific report for your exact address in Unity, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Unity averages can't show:
We read public map data around Unity — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Unity average
How we know this about Unity
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 Unity’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 Unity
When does frost risk typically end in Unity?
The last hard freeze (28°F) in Unity typically lands around Apr 24, 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 15.
When is the first frost in Unity?
The first hard freeze (28°F) in Unity typically arrives around Oct 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 29, so the watching starts about Sep 13 — about 172 days after the spring freeze cleared.
How long is the growing season in Unity?
Measured between 28°F hard freezes, Unity sees about 172 frost-free days — roughly Apr 24 through Oct 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 15 to Sep 29, about 137 days.
Is the soil safe to grow vegetables in Unity?
The federal record around Unity is a meaningful one — 160 documented sites, mostly Underground Storage Tanks entries (102), the nearest Superfund 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 Unity?
From about Sep 13 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 13 (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 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Unity's scale — its 4b band and its 172-day season. Your yard writes its own version of Unity'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 Unity’s own scale
6 of the readings below were taken at Unity's own scale — its own ~172-day season between 28°F freezes, the 634 acres it covers and 160 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Unity's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Unity's own 28°F hard-freeze dates, about Apr 24 and Oct 13 and the ~172-day span between themNOAA 1991–2020 Climate Normals
- 160 documented contamination sites on the federal record near Unity, the closest Superfund record about 0.1 miles out from the town centreFederal environmental registers
- Unity's boundary and the 634 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~172-day seasonGrowable Ground crop-matching engine
- The ecoregion at Unity'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 Unity's 634 acres read through its county's SSURGO summaryfrom Marathon County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Marathon 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 Marathon County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Unity's 634 acreswhy one lot differs from the next →
- Which side of Unity you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 634 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Superfund 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 Unity-wide figureread your own land →
More in Wisconsin
Wider growing context
What grows across WisconsinUnity sits outside our named growing regions, so Wisconsin as a whole is its closest context here.
Nearby growing guides