McHenry County Soil Data
McHenry County, Illinois
USDA SSURGO / PHZMAvg pH
6.3
Texture
Silt Loam
Drainage
N/A
Organic Matter
6.3%
Hydrologic Group
N/A
Data Story
About Soil in McHenry County, Illinois
Northern Illinois Soil Excellence
McHenry County features a pH of 6.29, which is slightly more acidic than the state average. Despite this, the county earns an elite soil score of 85.6, indicating world-class potential for plant growth.
Diverse Mix with High Sand
The soil contains 22.6% sand, 52.2% silt, and 20.3% clay, providing a diverse mix that balances drainage with nutrient storage. This higher sand content compared to southern neighbors often leads to easier spring tilling.
Exceptional Organic Wealth
With a massive 6.34% organic matter content, McHenry County more than doubles the state average of 2.94%. This richness is paired with a high water capacity of 0.220 in/in, making it some of the most productive earth in the nation.
Natural Efficiency and Flow
While specific drainage and taxonomic data are not currently available, the high sand and organic matter levels suggest very healthy water movement. This soil is likely to stay aerated even after significant rainfall.
Abundance in Zone 5b
In Zone 5b, McHenry County is ideal for hearty vegetables and premium landscaping. The extraordinary organic content means you may need less fertilizer than almost anywhere else in the state.
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 McHenry County have?
McHenry County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 23% sand, 52% silt, and 20% clay. Loamy soils hold moisture well and support a wide range of plants.
Is McHenry County's soil acidic or alkaline?
McHenry 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 McHenry County?
Drainage class data is not currently available for McHenry County.
What crops or plants grow well in McHenry County's soil?
Based on McHenry County's Silt Loam texture, pH of 6.3, 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 McHenry County?
The dominant USDA soil order for McHenry County is not currently available in our dataset.
Soil & Planting Advisory: McHenry County
Soil Verdict
McHenry 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
McHenry County is somewhat cooler than the Illinois statewide average.
Planning your lawn? View lawn care data for McHenry 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.