Iosco County Soil Data
Iosco County, Michigan
USDA SSURGO / PHZMAvg pH
5.3
Texture
Sandy Loam
Drainage
N/A
Organic Matter
14.9%
Hydrologic Group
N/A
Data Story
About Soil in Iosco County, Michigan
Acidic Sands Along the Coast
Iosco County’s soil averages a pH of 5.31, aligning almost perfectly with the Michigan state average but remaining quite acidic compared to the 6.5 national median. This lower pH reflects the county's northern character and its influence from local forest litter.
Dominantly Sandy Soil Mix
With 68.8% sand, Iosco’s soil is highly porous and lightweight. The low 12.0% clay content means the soil warms up quickly in the spring but may struggle to hold onto fertilizers without careful management.
High Organic Matter in Sandy Plots
Organic matter is impressively high at 14.91%, far exceeding the national 2.0% benchmark. However, an available water capacity of 0.156 in/in means the soil drains quickly, making consistent moisture management crucial for high-yield gardening.
Rapid Water Movement Near the Lake
Official drainage class data is limited here, but the 68.8% sand content suggests rapid drainage is the norm. Gardeners should expect soil to dry out faster than in clay-heavy counties to the south.
Garden Success in Zone 5b
Zone 5b gardeners in Iosco can find great success with blueberries and other acid-loving shrubs that thrive in sandy, low-pH soils. Adding compost can help bridge the gap in water retention for more sensitive vegetable crops.
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: Sandy Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Acidic Soil Detected
Your county's average pH is 5.3. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Iosco County have?
Iosco County's soil is classified as Sandy Loam. This indicates the relative proportions of sand, silt, and clay — 69% sand, 16% silt, and 12% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Iosco County's soil acidic or alkaline?
Iosco County's soil has a low pH of 5.3, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Iosco County?
Drainage class data is not currently available for Iosco County.
What crops or plants grow well in Iosco County's soil?
Based on Iosco County's Sandy Loam texture, pH of 5.3, 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 Iosco County?
The dominant USDA soil order for Iosco County is not currently available in our dataset.
Soil & Planting Advisory: Iosco County
Soil Verdict
Iosco 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
Iosco County closely matches the Michigan 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 Iosco 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.