Calhoun County Soil Data
Calhoun County, Michigan
USDA SSURGO / PHZMAvg pH
5.1
Texture
Loam
Drainage
N/A
Organic Matter
8.8%
Hydrologic Group
N/A
Data Story
About Soil in Calhoun County, Michigan
Higher Acidity in a Sand-Silt Matrix
Calhoun County’s soil is more acidic than most, with an average pH of 5.13 compared to the national median of 6.5. Its soil score of 45.3 is below the state average of 60.5, suggesting some challenges for specific agricultural uses. Managing this acidity is often the first step for local growers.
Balanced Sand and Silt Mix
The composition is a near-even split of 49.7% sand and 22.4% silt, providing a stable foundation for root growth. With 9.4% clay, the soil offers moderate nutrient retention despite its lighter feel. This mix allows for good drainage while maintaining enough body to hold its shape.
Strong Organic Content Above National Norms
An organic matter level of 8.83% far exceeds the national average of 2.0%, providing a natural nutrient boost. However, the available water capacity is 0.154 in/in, which is lower than the Michigan average of 0.202. Gardeners should plan for consistent irrigation during the dry mid-summer months.
Managed Hydrology for Healthy Roots
Detailed drainage classes are unavailable, but the soil's sand content suggests naturally efficient water movement. This drainage profile helps oxygen reach plant roots, which is essential in the local climate. Proper organic amendments can help improve the water-holding capacity of these fields.
Gardening Success in Hardiness Zone 6a
Zone 6a allows for a wide variety of perennials and annuals, from potatoes to flowering shrubs. The acidic nature of the soil makes it a natural home for acid-loving plants like blueberries or azaleas. With a little lime and compost, your Calhoun County garden will flourish.
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: Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Acidic Soil Detected
Your county's average pH is 5.1. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Calhoun County have?
Calhoun County's soil is classified as Loam. This indicates the relative proportions of sand, silt, and clay — 50% sand, 22% silt, and 9% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Calhoun County's soil acidic or alkaline?
Calhoun County's soil has a low pH of 5.1, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Calhoun County?
Drainage class data is not currently available for Calhoun County.
What crops or plants grow well in Calhoun County's soil?
Based on Calhoun County's Loam texture, pH of 5.1, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas, row crops and vegetable gardens.
What USDA soil order is found in Calhoun County?
The dominant USDA soil order for Calhoun County is not currently available in our dataset.
Soil & Planting Advisory: Calhoun County
Soil Verdict
Calhoun County is in USDA hardiness zone 6a, a moderate climate zone. where winter lows can reach -10°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
Calhoun County is somewhat warmer than the Michigan statewide average.
Planning your lawn? View lawn care data for Calhoun County on LawnByCounty.com →
Other Counties in Michigan
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.