Allen County Soil Data
Allen County, Kansas
USDA SSURGO / PHZMAvg pH
6.2
Texture
Silty Clay Loam
Drainage
N/A
Organic Matter
2.7%
Hydrologic Group
N/A
Data Story
About Soil in Allen County, Kansas
Slightly Acidic Soils Define Allen County
Allen County features an average soil pH of 6.23, which is more acidic than the state average of 6.80. While specific taxonomic data is limited, this pH level remains close to the national median of 6.5. This chemical profile provides a versatile foundation for a variety of Midwestern crops.
High Silt Content Powers Local Agriculture
The soil is comprised of 55.7% silt and 29.2% clay, with a relatively low sand content of 15.2%. This heavy silt and clay mix ensures excellent nutrient retention and stability for large-scale farming. However, the high clay fraction means the ground requires careful timing to avoid compaction during wet seasons.
Superior Organic Matter Boosts Growth
With 2.72% organic matter, Allen County exceeds both the state average of 2.22% and the national average. The available water capacity of 0.182 in/in is also slightly higher than the state benchmark. This combination creates a fertile environment that holds onto moisture effectively during dry Kansas summers.
Understanding Local Water Movement
Specific drainage class and hydrologic group data are currently limited for this area. Based on the 29.2% clay content, builders and gardeners should expect moderate to slow natural drainage. On-site percolation tests are recommended before starting significant construction or landscaping projects.
Thriving in Hardiness Zone 6b
Situated in USDA Hardiness Zone 6b, Allen County is ideal for growing hearty staples like winter wheat and corn. The soil's high organic content also supports vibrant home vegetable gardens. Grab a trowel and take advantage of these nutrient-rich silty soils this spring.
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: Silty Clay Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Clay Soil Detected
Clay soils can struggle with drainage. These products improve soil structure and water flow.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Allen County have?
Allen County's soil is classified as Silty Clay Loam. This indicates the relative proportions of sand, silt, and clay — 15% sand, 56% silt, and 29% 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 6.2, 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 Silty Clay Loam texture, pH of 6.2, 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 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
Allen County closely matches the Kansas 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 Allen County on LawnByCounty.com →
Other Counties in Kansas
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.