Eau Claire County, in Wisconsin, sits in USDA hardiness zone 4b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit cabbage, cranberry, turkish rocket, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Eau Claire County lies within the Driftless Area — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Eau Claire County holds more than one microclimate.
Soils and elevations shift across Eau Claire 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 Eau Claire County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Eau Claire County — the short answer
Eau Claire County, Wisconsin: USDA zone 4b, about 165 days between hard freezes, across 408K acres.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 27
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 9
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~165
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 408K 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 4b is Eau Claire County's average, not your lot's — a low corner or a tree line moves it. Against Eau Claire County's 165-day season, see what your own ground reads.
Heat in Eau Claire County
Across a year, Eau Claire County accumulates about 2,104 growing degree days above 50°F, about 46 fewer than the middle Wisconsin county — ahead of 29 of Wisconsin’s 72 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 Eau Claire County
Across Eau Claire County, the ground is predominantly Alfisols, where Plainfield, Elkmound, and Seaton are the most extensive named soil series. The soil is generally well drained with a silt loam surface. Topsoil pH runs about 5.5–6.2, moderately acidic. Rainfall drains through hydrologic group A soils.
Soil order
Alfisols
Drainage
Well drained
Prime farmland
14%
Hydric soils
13%
Soil still varies lot by lot — soil types explained.
How the ground varies across Eau Claire County
The USDA soil survey maps 37% of Eau Claire County as well drained — but another 61% drains differently: 23% excessively drained, 16% somewhat poorly drained.
Plainfield is the most extensive named soil at 10% of mapped acres, then Elkmound (8%) and Seaton (8%).
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 Eau Claire County
Each reading below is measured for Eau Claire 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 Eau Claire County are well drained, in hydrologic group A — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Eau Claire County runs about pH 5.5–6.2, on the acidic side.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Season length
MeasuredEau Claire County runs about 165 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
MeasuredEau Claire County 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 Eau Claire County is in
Eau Claire County spans 2 EPA Level III ecoregions — North Central Hardwood Forests (57%) and Driftless Area (43%). 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 Eau Claire County
We scored all 1,086 plants against Eau Claire County's own USDA zone 4b and its own 165-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 Wisconsin profile.
Is it too late to plant in Eau Claire County?
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 30; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 9 — 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.
Documented around Eau Claire County
- Japanese beetle4 documented records
- monarch butterfly217 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Eau Claire County
USGS estimates 51,835 lb of Glyphosate on Eau Claire County farmland in 2019, its largest by weight, ahead of Metolachlor & Metolachlor-s (34,728 lb) and Metolachlor-s (30,359 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 Eau Claire County — and how to grow with it.
We checked the federal record across Eau Claire County — 839 documented sites across 7 of the 9 source types we track.
The most significant on record: 2 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 Eau Claire 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 Eau Claire County
Closest first, across Eau Claire County. Listing isn't leaking, and distance isn't exposure.
- Ronald J DekanUnderground Storage Tanks · 200 ft
- VAUGHN W LIERMANUnderground Storage Tanks · 1.4 mi
- DORIS ADRIANUnderground Storage Tanks · 1.7 mi
- EC-26/07W/06-0076Nitrate · 2.2 mi
- GTE - FALL CREEK 4250002AUnderground Storage Tanks · 2.5 mi
- EC-26/08W/01-0017Nitrate · 2.5 mi
- EAU CLAIRE ENERGY COOPERATIVEBrownfields · 2.5 mi
- ELVIRA BAINUnderground Storage Tanks · 2.6 mi
- VERNON & JOSEPHINE OBRIENUnderground Storage Tanks · 2.6 mi
- PECHAS PINEVIEWUnderground Storage Tanks · 2.6 mi
- LINDEEN DISTUnderground Storage Tanks · 2.6 mi
- Don KellyUnderground Storage Tanks · 2.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Eau Claire 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 Eau Claire County.
Sources Checked
across Eau Claire County
Severity Distribution
across Eau Claire County
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Eau Claire 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 Eau Claire County average
Your land is one point inside Eau Claire County
Everything above resolves to Eau Claire County as a whole — one PHZM band and one county frost record, read across 408K 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 Eau Claire County Average
Eau Claire County Average
- ●USDA Zones 4b, averaged across Eau Claire County
- ●One soil character for all of Eau Claire County
- ●Frost dates read at Eau Claire County's scale: Apr 27 to Oct 9
YOUR Parcel
- ✓Your exact zone, not Eau Claire County's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Eau Claire County
Pull a site-specific report for your exact address in Eau Claire County, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Eau Claire County averages can't show:
We read public map data around Eau Claire County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Eau Claire County average
How we know this about Eau Claire 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 Eau Claire County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Eau Claire County
When does frost risk typically end in Eau Claire County?
The last hard freeze (28°F) in Eau Claire County typically lands around Apr 27, 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 18.
How long is the growing season in Eau Claire County?
Measured between 28°F hard freezes, Eau Claire County sees about 165 frost-free days — roughly Apr 27 through Oct 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 18 to Sep 25, about 130 days.
Is the soil safe to grow vegetables in Eau Claire County?
The federal record around Eau Claire County is a meaningful one — 839 documented sites, mostly Underground Storage Tanks entries (463), the nearest Underground Storage Tanks record under a tenth of a mile 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 Eau Claire County's scale — its 4b band and its 165-day season. Your yard writes its own version of Eau Claire 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 Wisconsin's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Eau Claire County’s own scale
9 of the readings below were taken at Eau Claire County's own scale — its own ~165-day span between 28°F freezes, the 3 most extensive soil series mapped here and 839 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Eau Claire County's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Eau Claire County's own 28°F hard-freeze dates and its ~165-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Eau Claire CountyUSDA NRCS SSURGO
- 839 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Underground Storage Tanks record under a tenth of a mile outFederal environmental registers
- Eau Claire County's boundary and the 408,270 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~165-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Eau Claire County spans, North Central Hardwood Forests the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Eau Claire County for 2 tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Eau Claire County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Wisconsin grower plans around — written at state scale, so they stay on the state guidefrom Wisconsin
What this page can’t tell you
- How the season shifts across Eau Claire County — the ~165 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 Eau Claire County's 408,270 acreswhy one lot differs from the next →
- Which of those 839 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 Eau Claire Countyread your own land →