Thiensville, Wisconsin, sits in USDA hardiness zone 6a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
These conditions suit cabbage, hazelnut, lavender, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Thiensville, 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 Thiensville 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 Thiensville — soil, climate, flood, and parcel records. How we handle your address.
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Thiensville — the short answer
Thiensville, Wisconsin: USDA zone 6a, about 212 days between hard freezes, across 664 acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~212
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 664 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 Thiensville's average, not your lot's — a low corner or a tree line moves it. Against Thiensville's 212-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Thiensville
Each reading below is measured for Thiensville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredThiensville runs about 212 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
MeasuredThiensville 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 Thiensville is in
Thiensville sits in the Southeastern Wisconsin Till Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Thiensville's own centroid rather than borrowed from Ozaukee County.
What Grows in Thiensville
Every plant below cleared Thiensville's own zone 6a and its 212-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Thiensville?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 10; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 7 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 5 — 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.
What's on the federal record near Thiensville
Closest first, within ~10 miles of Thiensville. Listing isn't leaking, and distance isn't exposure.
- IMMANUEL LUTHERAN CHURCHBrownfields · 550 ft
- GEORGE HENNINGS & SONUnderground Storage Tanks · 1500 ft
- LUX DENTALBrownfields · 1700 ft
- FIRST AUTO PARTSUnderground Storage Tanks · 1800 ft
- SCHMIDT FORD MERCURYUnderground Storage Tanks · 1900 ft
- BETTY JOHNSON LLCBrownfields · 1900 ft
- BETTY JOHNSONS INTERIORSUnderground Storage Tanks · 1900 ft
- WALGREEN CO #4884Brownfields · 1900 ft
- EGELHOFF LAWN MOWER SERVUnderground Storage Tanks · 1900 ft
- JOHNS UNIONUnderground Storage Tanks · 2100 ft
- Thiensville Self Serve MartUnderground Storage Tanks · 2100 ft
- OZ-09/21E/14-0030Nitrate · 2100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Thiensville'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 Thiensville.
Sources Checked
within ~10 miles of Thiensville
Severity Distribution
within ~10 miles of Thiensville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Thiensville, Toxics Release Inventory runs higher than the national average — 209 sites within ~10 miles of Thiensville. That's not a problem with your land — it's information about it.
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 Thiensville
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 Thiensville average
Your land is one point inside Thiensville
Everything above resolves to Thiensville as a whole — one PHZM band and one 28°F frost record, read across 664 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 Thiensville Average
Thiensville Average
- ●USDA Zones 6a, averaged across Thiensville
- ●One soil character for all of Thiensville
- ●Frost dates read at Thiensville's scale: Apr 7 to Nov 5
YOUR Parcel
- ✓Your exact zone, not Thiensville's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Thiensville
Pull a site-specific report for your exact address in Thiensville, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Thiensville averages can't show:
We read public map data around Thiensville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Thiensville average
How we know this about Thiensville
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 Thiensville’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 Thiensville
When does frost risk typically end in Thiensville?
The last hard freeze (28°F) in Thiensville typically lands around Apr 7, 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 28.
When is the first frost in Thiensville?
The first hard freeze (28°F) in Thiensville typically arrives around Nov 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 22, so the watching starts about Oct 6 — about 212 days after the spring freeze cleared.
How long is the growing season in Thiensville?
Measured between 28°F hard freezes, Thiensville sees about 212 frost-free days — roughly Apr 7 through Nov 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 28 to Oct 22, about 177 days.
Is the soil safe to grow vegetables in Thiensville?
The federal record around Thiensville runs heavier than most — 2,484 documented sites, mostly Underground Storage Tanks entries (1,114), the nearest Brownfields record about 0.1 miles 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 Thiensville?
From about Oct 6 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 Nov 5 (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 Nov 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Thiensville's scale — its 6a band and its 212-day season. Your yard writes its own version of Thiensville'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 Thiensville’s own scale
6 of the readings below were taken at Thiensville's own scale — its own ~212-day season between 28°F freezes, the 664 acres it covers and 2,484 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Thiensville's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Thiensville's own 28°F hard-freeze dates, about Apr 7 and Nov 5 and the ~212-day span between themNOAA 1991–2020 Climate Normals
- 2,484 documented contamination sites on the federal record near Thiensville, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Thiensville's boundary and the 664 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~212-day seasonGrowable Ground crop-matching engine
- The ecoregion at Thiensville's own centroid, the Southeastern Wisconsin Till PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Thiensville's 664 acres read through its county's SSURGO summaryfrom Ozaukee County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Ozaukee 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 Ozaukee County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Thiensville's 664 acreswhy one lot differs from the next →
- Which side of Thiensville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 664 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Thiensville-wide figureread your own land →