Iowa County Soil Data
Iowa County, Wisconsin
USDA SSURGO / PHZMAvg pH
6.2
Texture
Silt Loam
Drainage
N/A
Organic Matter
3.1%
Hydrologic Group
N/A
Data Story
About Soil in Iowa County, Wisconsin
Moderately Acidic Soils in Iowa County
Iowa County soil features an average pH of 6.21, which is notably more alkaline than the Wisconsin state average of 5.63. This level sits just below the national median of 6.5, providing a slightly acidic environment suitable for many temperate crops. While specific taxonomic data for this region is limited, the chemical balance suggests a versatile foundation for local agriculture.
Silt-Heavy Mix Defines the Land
The soil composition is dominated by 52.3% silt, paired with 30.1% sand and 16.2% clay. This high silt content creates a smooth texture that offers excellent workability for farmers. This balanced mix ensures the soil is less prone to the heavy compaction often found in clay-rich regions.
Consistent Growing Potential
Organic matter content stands at 3.10%, which exceeds the national average of 2.0% but remains below the state average of 11.02%. The available water capacity is 0.198 in/in, very close to the state benchmark of 0.204. These figures indicate a reliable ability to sustain plant life through varied weather patterns.
A Focus on Moisture Management
While specific drainage and hydrologic classifications are unavailable in current data sets, the soil's silty makeup typically suggests moderate infiltration rates. Growers should monitor local runoff patterns during heavy Wisconsin rains to ensure proper root aeration. Local topography plays a significant role in how these silty soils manage water.
Thriving in Hardiness Zone 5a
Located in USDA Hardiness Zone 5a, Iowa County is ideal for cool-season vegetables like kale and hardy perennials. The soil's 71.1 overall score outperforms the state average of 68.2, making it a prime spot for new gardeners to find success. Start your garden today with confidence in this high-performing soil.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Hydrologic group data not available.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Silt Loam
Typical soil profile. Actual depths vary by location.
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Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Iowa County have?
Iowa County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 30% sand, 52% silt, and 16% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Iowa County's soil acidic or alkaline?
Iowa County's soil has a pH of 6.2, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Iowa County?
Drainage class data is not currently available for Iowa County.
What crops or plants grow well in Iowa County's soil?
Based on Iowa County's Silt Loam texture, pH of 6.2, and drainage class, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens.
What USDA soil order is found in Iowa County?
The dominant USDA soil order for Iowa County is not currently available in our dataset.
Soil & Planting Advisory: Iowa County
Soil Verdict
Iowa County is in USDA hardiness zone 5a, a cold climate zone. where winter lows can reach -20°F. Freeze-thaw cycles are moderate; soil biology slows in winter but recovers reliably in spring, supporting a broad range of plants.
Planting Guidance
A wide plant palette is possible: deciduous trees, most shrubs, cool-season vegetables, and many perennials thrive here. With extreme winter lows, any marginally hardy plants need heavy mulch and wind protection. Always match plant selections to the specific microclimate of your property — low spots, slopes, and wind exposure can shift effective hardiness by half a zone.
Soil Implications
Moderate freeze-thaw cycles naturally aerate the soil but can also cause compaction in clay-heavy areas; annual core aeration is beneficial. Organic matter amendments decompose at a moderate pace — aim for 3-5% organic content for optimal fertility. When soil temperatures drop below freezing, microbial nitrogen cycling stops; spring fertilization is more effective than late-fall application.
Regional Context
Iowa County closely matches the Wisconsin average hardiness conditions.
Planning your lawn? View lawn care data for Iowa County on LawnByCounty.com →
Other Counties in Wisconsin
Soil data sourced from USDA SSURGO via Soil Data Access. Data is informational only and should not be used as a substitute for on-site soil testing. Contact your local NRCS office for site-specific soil information.