Harrison County Soil Data
Harrison County, Indiana
USDA SSURGO / PHZMAvg pH
5.9
Texture
Silt Loam
Drainage
N/A
Organic Matter
2.1%
Hydrologic Group
N/A
Data Story
About Soil in Harrison County, Indiana
Silt-rich profiles in the Southern Hills
Harrison County has an average pH of 5.93, which is more acidic than the national median of 6.5 and slightly below the state average of 6.08. While taxonomic details are unavailable, the low sand content suggests a unique mineral profile. This acidity may require monitoring for sensitive garden plants.
Massive silt content defines the texture
With a staggering 68.5% silt and only 12.7% sand, Harrison County's soil is exceptionally smooth and fine-grained. The 18.8% clay content provides necessary structure, though the dominant silt can make the soil prone to erosion. It is a highly moisture-retentive mix that feels like flour when dry.
High water capacity despite low organic matter
Organic matter sits at 2.14%, which is lower than the Indiana average of 4.90% but slightly above the national average. Remarkably, the available water capacity is 0.207 in/in, surpassing the state average. This indicates that the silt-heavy texture is doing the heavy lifting for water storage.
Consistent moisture in a 63.8-rated soil
Harrison County earns a soil score of 63.8, reflecting its position in the more rugged terrain of southern Indiana. While specific drainage classes are not provided, the high silt and water capacity suggest the ground stays moist. This can be a benefit during the hot, dry summers typical of the region.
Extended growing seasons in Zone 6b
Located in hardiness zone 6b, Harrison County enjoys a slightly milder climate for gardening and farming. The silt-heavy soil is excellent for moisture-loving plants like berries and leafy greens. Consider adding compost to boost the organic matter and unlock this soil's full potential.
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
Acidic Soil Detected
Your county's average pH is 5.9. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Harrison County have?
Harrison County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 13% sand, 69% silt, and 19% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Harrison County's soil acidic or alkaline?
Harrison County's soil has a pH of 5.9, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Harrison County?
Drainage class data is not currently available for Harrison County.
What crops or plants grow well in Harrison County's soil?
Based on Harrison County's Silt Loam texture, pH of 5.9, 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 Harrison County?
The dominant USDA soil order for Harrison County is not currently available in our dataset.
Soil & Planting Advisory: Harrison County
Soil Verdict
Harrison 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
Harrison County closely matches the Indiana average hardiness conditions. The zone range of 6b-7a within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Harrison County on LawnByCounty.com →
Other Counties in Indiana
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.