Thomas County Soil Data
Thomas County, Kansas
USDA SSURGO / PHZMAvg pH
7.2
Texture
Gravelly sandy loam
Drainage
Excessively drained
Organic Matter
2.1%
Hydrologic Group
A
Data Story
About Soil in Thomas County, Kansas
A Foundation of Gravelly Sandy Loam
Thomas County is defined by its gravelly sandy loam and Entisol soil order. The average pH of 7.22 sits well above the national median of 6.5, indicating an alkaline environment. This profile supports resilient agriculture but may require specific nutrient management for acid-loving plants.
Silt Dominates the High Plains
A robust 59.6% silt content dominates the landscape, balanced by 23.0% clay and 17.5% sand. This high-silt mix creates a soil that is relatively easy to work while retaining enough moisture for crop development. Farmers benefit from a texture that avoids the heavy density of clay-heavy regions.
Superior Water Retention Capacity
The organic matter content stands at 2.11%, trailing slightly behind the Kansas average of 2.22%. However, the available water capacity reaches 0.196 in/in, which beats the state average of 0.180. This makes the county exceptionally efficient at holding moisture in a semi-arid climate.
Rapid Drainage and Low Runoff
The soil is classified as excessively drained and belongs to hydrologic group A. This means water moves through the profile rapidly with very low runoff potential. While this prevents pooling, it requires careful irrigation timing to keep roots hydrated.
Flourishing in Zone 6a
Located in USDA hardiness zone 6a, Thomas County is perfectly suited for winter wheat, sorghum, and hardy perennials. Gardeners should focus on drought-tolerant species that thrive in alkaline conditions. Start your garden today with native grasses or robust sunflowers.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group A — Low Runoff
Sandy, well-drained soils with high infiltration rates. Water moves quickly through the soil profile. Lowest runoff potential when thoroughly wetted.
Drainage Class
Excessively drained
Water is removed very rapidly. Very sandy or gravelly soils with little water retention.
Soil Profile
Dominant texture: Gravelly sandy loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Sandy Soil Detected
Sandy soils drain quickly and can dry out. These products boost water retention and organic matter.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Thomas County have?
Thomas County's soil is classified as Gravelly sandy loam. This indicates the relative proportions of sand, silt, and clay — 17% sand, 60% silt, and 23% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Thomas County's soil acidic or alkaline?
Thomas County's soil has a pH of 7.2, which is near neutral. This range is ideal for most garden plants and field crops.
What is the drainage class for Thomas County?
Thomas County has a dominant drainage class of "Excessively drained." Moderate drainage allows adequate moisture retention while still permitting excess water to drain over time.
What crops or plants grow well in Thomas County's soil?
Based on Thomas County's Gravelly sandy loam texture, pH of 7.2, and Excessively drained, the soil is well suited for drought-tolerant crops and native grasses, row crops and vegetable gardens.
What USDA soil order is found in Thomas County?
Thomas County's dominant soil order is Entisols. Entisols are recently formed soils with little to no horizon development. They are common on floodplains, steep slopes, and sandy deposits.
Soil & Planting Advisory: Thomas County
Soil Verdict
Thomas 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
Thomas County closely matches the Kansas average hardiness conditions.
Planning your lawn? View lawn care data for Thomas 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.