Clinton County Soil Data
Clinton County, Illinois
USDA SSURGO / PHZMAvg pH
6.4
Texture
Silt Loam
Drainage
N/A
Organic Matter
2.2%
Hydrologic Group
N/A
Data Story
About Soil in Clinton County, Illinois
Typical Illinois Soil Characteristics
Clinton County features an average soil pH of 6.37, which is nearly identical to the state average of 6.39. This level is slightly more acidic than the national median of 6.5, but remains well within the preferred range for most Midwestern agriculture. This chemical consistency provides a predictable foundation for local farmers and gardeners alike.
Fine-Textured Silt Dominates the Landscape
The soil composition is 65.1% silt and 21.4% clay, with a low sand fraction of 13.4%. This heavy silt profile creates a smooth, dense soil that is very effective at trapping nutrients but can be slow to drain. It requires careful management to prevent compaction, especially when using heavy machinery on wet ground.
High Water Retention for Crop Security
Clinton County excels in water storage with an available water capacity of 0.214 in/in, well above the state average of 0.204 in/in. However, organic matter is lower than the state average at 2.21%. This suggests that while the soil is great at surviving dry spells, it may need supplemental fertilization to reach peak productivity.
Sponge-Like Soil Performance
While formal drainage classes are not provided, the high water capacity of 0.214 in/in suggests the soil acts as an efficient reservoir. The high silt and clay levels mean water moves slowly through the profile, which can lead to ponding in flat areas during heavy rains. This makes drainage management a priority for local land development and farming.
Thriving in the Warmth of Zone 6b
The Zone 6b climate in Clinton County allows for a diverse range of crops, including berries and hardy vegetables. Your soil is excellent at holding water, which is a major advantage during the hot Illinois July and August. Adding organic compost will help bridge the gap in soil fertility and ensure a bountiful home harvest.
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.
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 — 13% sand, 65% 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 6.4, 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?
Drainage class data is not currently available for Clinton County.
What crops or plants grow well in Clinton County's soil?
Based on Clinton County's Silt Loam texture, pH of 6.4, 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 Clinton County?
The dominant USDA soil order for Clinton County is not currently available in our dataset.
Soil & Planting Advisory: Clinton County
Soil Verdict
Clinton County is in USDA hardiness zone 6b, a moderate climate zone. where winter lows can reach -5°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. Winter protection (mulch, burlap wraps) helps push the zone boundary for desired species. 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 Illinois average hardiness conditions.
Planning your lawn? View lawn care data for Clinton County on LawnByCounty.com →
Other Counties in Illinois
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.