Allen County Soil Data
Allen County, Kentucky
USDA SSURGO / PHZMAvg pH
5.5
Texture
Silt Loam
Drainage
N/A
Organic Matter
2.0%
Hydrologic Group
N/A
Data Story
About Soil in Allen County, Kentucky
Low pH in Allen County
The soil pH in Allen County averages 5.55, making it more acidic than both the national median of 6.5 and the state average of 5.80. This acidity influences nutrient availability and requires careful management for sensitive plants.
High Silt, Low Sand
The mix consists of 62.8% silt, 19.4% clay, and 17.7% sand. This high concentration of silt suggests excellent water storage but can lead to poor aeration if the soil is not properly aerated.
Building Organic Matter
The organic matter content is 1.99%, nearly identical to the national average of 2.0% but well below the Kentucky state average of 3.55%. Available water capacity sits at 0.178 in/in, slightly under the state benchmark of 0.186.
Water Management Needs
Detailed drainage records are not currently available, yet the soil score of 44.1 indicates moderate challenges for intensive use. Homeowners should observe runoff patterns during heavy rains to plan their landscapes effectively.
Ready for Zone 7a
Falling in hardiness zone 7a, Allen County is perfect for everything from spring greens to late-harvest squash. Enrich your soil with compost and start your backyard garden this season.
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 5.5. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Allen County have?
Allen County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 18% sand, 63% silt, and 19% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Allen County's soil acidic or alkaline?
Allen County's soil has a pH of 5.5, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Allen County?
Drainage class data is not currently available for Allen County.
What crops or plants grow well in Allen County's soil?
Based on Allen County's Silt Loam texture, pH of 5.5, 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 Allen County?
The dominant USDA soil order for Allen County is not currently available in our dataset.
Soil & Planting Advisory: Allen County
Soil Verdict
Allen 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
Allen County closely matches the Kentucky average hardiness conditions.
Planning your lawn? View lawn care data for Allen 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.