LaSalle County Soil Data
LaSalle County, Illinois
USDA SSURGO / PHZMAvg pH
6.5
Texture
Silt Loam
Drainage
N/A
Organic Matter
3.9%
Hydrologic Group
N/A
Data Story
About Soil in LaSalle County, Illinois
Balanced and Productive Soils
LaSalle County features an average pH of 6.49, which is nearly identical to the national median of 6.5. This balanced acidity contributes to a strong soil score of 82.8, well above the state average of 73.6.
Silt-Driven Soil Texture
The soil mix contains 60.2% silt and 24.0% clay, providing a sturdy and nutrient-retentive foundation. With just 14.4% sand, the soil resists rapid drying but requires careful management to prevent compaction.
Healthy Organic Reserves
At 3.86%, the organic matter content is significantly higher than the Illinois average of 2.94%. The available water capacity of 0.204 in/in perfectly matches the state average, ensuring reliable moisture for plants.
Steady Water Availability
Though formal drainage classifications are not listed, the high silt percentage suggests a soil that absorbs and holds water well. This makes the land reliable during dry spells but potentially slow to dry out in early spring.
Cultivate in Zone 5b
LaSalle County is in USDA Hardiness Zone 5b, where the balanced pH and high organic matter support everything from corn to leafy greens. It is an ideal landscape for growers looking for consistent, high-quality soil performance.
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 LaSalle County have?
LaSalle County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 14% sand, 60% silt, and 24% clay. Loamy soils hold moisture well and support a wide range of plants.
Is LaSalle County's soil acidic or alkaline?
LaSalle County's soil has a pH of 6.5, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for LaSalle County?
Drainage class data is not currently available for LaSalle County.
What crops or plants grow well in LaSalle County's soil?
Based on LaSalle County's Silt Loam texture, pH of 6.5, 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 LaSalle County?
The dominant USDA soil order for LaSalle County is not currently available in our dataset.
Soil & Planting Advisory: LaSalle County
Soil Verdict
LaSalle County is in USDA hardiness zone 5b, a cold climate zone. where winter lows can reach -15°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
LaSalle County is somewhat cooler than the Illinois statewide average.
Planning your lawn? View lawn care data for LaSalle 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.