Clinton County Soil Data
Clinton County, Iowa
USDA SSURGO / PHZMAvg pH
6.3
Texture
Silt loam
Drainage
Well drained
Organic Matter
3.3%
Hydrologic Group
C
Data Story
About Soil in Clinton County, Iowa
Forest-Derived Alfisols
Clinton's Alfisols have an average pH of 6.29, making them slightly more acidic than the 6.43 state average. These forest-derived soils are known for their distinct layers and moderate fertility levels.
Fine Silt Loam Textures
A silt loam texture dominates the area, featuring 55.2% silt and 22.9% sand. This high silt content creates a soft, flour-like texture that holds water effectively but requires protection from erosion.
Consistent Moisture Availability
The organic matter content is 3.33%, which sits just below the Iowa average of 3.81%. The available water capacity of 0.193 in/in is almost identical to the state average, providing a reliable source of water for roots.
Well Drained and Versatile
These soils are classified as well drained and belong to hydrologic group C. This status indicates a good balance for both farming and building, as water moves through the profile at a moderate, steady rate.
Berries and Orchards in 5a
Located in zone 5a, the silt loam is an excellent medium for growing berries and fruit trees. Clear a patch in your yard and start planting; these soils are ready to support your next garden.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group C — Moderate-High Runoff
Soils with slow infiltration rates, often with a layer that impedes downward water movement. Higher clay content restricts drainage.
Drainage Class
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Silt loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Soil Amendment Products
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Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Clinton County have?
Clinton County's soil is classified as Silt loam. This indicates the relative proportions of sand, silt, and clay — 23% sand, 55% silt, and 21% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Clinton County's soil acidic or alkaline?
Clinton County's soil has a pH of 6.3, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Clinton County?
Clinton County has a dominant drainage class of "Well drained." Well-drained soils allow excess water to move through quickly, reducing waterlogging risk and supporting most field and garden crops.
What crops or plants grow well in Clinton County's soil?
Based on Clinton County's Silt loam texture, pH of 6.3, and Well drained, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Clinton County?
Clinton County's dominant soil order is Alfisols. Alfisols are moderate to high base-status soils with a clay-enriched subsoil. They support productive forests and cropland across temperate regions.
Soil & Planting Advisory: Clinton County
Soil Verdict
Clinton 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
Clinton County closely matches the Iowa average hardiness conditions. The zone range of 5a-5b within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Clinton County on LawnByCounty.com →
Other Counties in Iowa
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.