Washington County Soil Data
Washington County, Kansas
USDA SSURGO / PHZMAvg pH
6.3
Texture
Silt Loam
Drainage
N/A
Organic Matter
2.6%
Hydrologic Group
N/A
Data Story
About Soil in Washington County, Kansas
Slightly Acidic Northern Soils
Washington County has an average pH of 6.26, which is slightly more acidic than the national median of 6.5. While specific taxonomic classification data is unavailable, this pH level is favorable for many common garden vegetables. It represents a transition toward the more acidic soils of the eastern United States.
A Versatile Silt and Sand Mix
The soil contains 51.8% silt and 25.0% sand, providing a balanced texture that is easy to till. The 23.1% clay content helps with nutrient retention without making the ground too heavy or sticky. This composition supports a wide variety of both row crops and garden beds.
High Organic Matter for Growth
The organic matter content is an impressive 2.62%, well above the Kansas state average of 2.22%. Combined with a high available water capacity of 0.193 in/in, the soil score reaches a strong 67.2. These fertile conditions provide an excellent head start for any agricultural endeavor.
Regional Water Dynamics
Official drainage class and hydrologic group data are not available for this county's primary soils. Residents should perform a simple 'perc test' to see how quickly water drains on their specific property. The silt-heavy profile generally suggests moderate drainage and good moisture management.
Productive Gardening in Zone 6a
Washington County sits in hardiness zone 6a, where tomatoes, peppers, and corn thrive in the rich soil. The high organic matter means you can grow a bounty of produce with minimal supplemental fertilizer. Start your backyard farm today and enjoy the benefits of this fertile land.
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
Soil Amendment Products
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Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Washington County have?
Washington County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 25% sand, 52% silt, and 23% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Washington County's soil acidic or alkaline?
Washington County's soil has a pH of 6.3, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Washington County?
Drainage class data is not currently available for Washington County.
What crops or plants grow well in Washington County's soil?
Based on Washington County's Silt Loam texture, pH of 6.3, 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 Washington County?
The dominant USDA soil order for Washington County is not currently available in our dataset.
Soil & Planting Advisory: Washington County
Soil Verdict
Washington County is in USDA hardiness zone 6a, a moderate climate zone. where winter lows can reach -10°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
Washington County closely matches the Kansas average hardiness conditions. The zone range of 6a-6b within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Washington 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.