Johnson County Soil Data
Johnson County, Kentucky
USDA SSURGO / PHZMAvg pH
N/A
Texture
Unknown
Drainage
N/A
Organic Matter
N/A
Hydrologic Group
N/A
Data Story
About Soil in Johnson County, Kentucky
Eastern Kentucky Soil Chemistry
Local taxonomic data is being cataloged, but Johnson County typically mirrors the Kentucky state average pH of 5.80. This puts the county below the national median of 6.5, reflecting the naturally acidic nature of Appalachian soils. These chemical conditions influence everything from forest health to backyard gardening success.
The Physics of Mountain Soil
Though specific sand and clay percentages are unavailable, the soil composition determines how easily water moves through the local landscape. The mix of particles impacts workability, which is a key factor for anyone looking to till or build on this terrain. Monitoring these textural shifts helps prevent erosion on Johnson County’s varied slopes.
High Regional Nutrient Benchmarks
Johnson County is part of a state ecosystem that boasts an average organic matter content of 3.55%, well above the 2.0% national average. The state's water capacity benchmark of 0.186 in/in suggests that these soils can hold significant moisture for plant use. This natural fertility supports the lush greenery found throughout the eastern hills.
Hydrology in the Appalachian Foothills
Dominant drainage classes and hydrologic groups for this area are not currently recorded in the primary dataset. Site-specific drainage is particularly important in mountainous regions to manage runoff and prevent soil saturation. Local land users should observe water behavior closely during heavy rainfall to understand their specific plot.
Garden Success in Zone 7a
Johnson County falls into Hardiness Zone 7a, supporting a wide range of native plants and vegetable varieties. The relatively mild winters allow for a long growing season that favors peppers, beans, and berries. It is a fantastic time to start a garden and utilize the region's natural growing potential.
Soil Composition
Composition data not available for this county.
Soil pH
pH data not available for this county.
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: Unknown
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
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Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Johnson County have?
Johnson County's soil is classified as Unknown. This indicates the relative proportions of sand, silt, and clay — sand percentage unavailable, silt percentage unavailable, and clay percentage unavailable. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Johnson County's soil acidic or alkaline?
pH data is not available for Johnson County.
What is the drainage class for Johnson County?
Drainage class data is not currently available for Johnson County.
What crops or plants grow well in Johnson County's soil?
Based on Johnson County's Unknown texture, soil pH, and drainage class, the soil is well suited for a variety of crops depending on local conditions.
What USDA soil order is found in Johnson County?
The dominant USDA soil order for Johnson County is not currently available in our dataset.
Soil & Planting Advisory: Johnson County
Soil Verdict
Johnson County is in USDA hardiness zone 7a, a moderate climate zone. where winter lows can reach 0°F. Mild winters mean soil rarely freezes deeply, allowing year-round microbial activity and faster organic matter breakdown.
Planting Guidance
Warm-season crops, citrus relatives, and heat-loving ornamentals do well. Cool-season vegetables should be planted in fall and winter. 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
Warm soils accelerate organic matter breakdown, so compost and mulch need replenishing more frequently than in cooler zones. Sandy soils common in warm zones drain quickly; water-retentive amendments like compost or peat help hold moisture. When soil temperatures drop below freezing, microbial nitrogen cycling stops; spring fertilization is more effective than late-fall application.
Regional Context
Johnson County closely matches the Kentucky 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 Johnson County on LawnByCounty.com →
Other Counties in Kentucky
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.