Coal County Soil Data
Coal County, Oklahoma
Avg pH
5.3
Texture
Water
Drainage
N/A
Organic Matter
1.4%
Hydrologic Group
D
Data Story
About Soil in Coal County, Oklahoma
More acidic soils with lower scores
Coal County's soil has a pH of 5.25, which is significantly more acidic than the state average of 6.06. The soil score of 19.1 is one of the lowest in the region, suggesting more challenges for traditional farming. Most crops in this county will benefit from regular soil testing and pH amendments.
Sandy-silt mix with moderate clay
The soil composition is 37.2% sand, 31.0% silt, and 18.8% clay. This mix offers a decent balance for root penetration but can be prone to compaction if worked when too wet. The sand and silt provide some drainage, though the clay helps retain some moisture during the hot summer months.
Lower organic matter and water capacity
Organic matter is 1.37%, falling below the state average of 1.72%. The available water capacity is also slightly below the state average at 0.140 in/in. These numbers suggest that soil health initiatives, like adding compost, could greatly improve the growing potential of the land.
Slow infiltration and drainage issues
The soil belongs to Hydrologic Group D, meaning it does not absorb water quickly and is prone to runoff. This characteristic can lead to standing water in low-lying areas after heavy rains. Farmers and homeowners should plan for drainage solutions to prevent waterlogged roots or foundation dampness.
Reliable gardening in zone 7b
Coal County resides in hardiness zone 7b, supporting a versatile array of Southern garden staples. Sweet potatoes and watermelons are excellent choices for these soils as they can handle the heat and slightly acidic conditions. Starting a garden here is rewarding if you focus on building up the soil's organic matter.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group D — High Runoff
Clay soils with very slow infiltration rates. Highest runoff potential. These soils have a permanent high water table or are shallow over impervious material.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Water
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Coal County have?
Coal County's soil is classified as Water. This indicates the relative proportions of sand, silt, and clay — 37% sand, 31% silt, and 19% clay. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Coal County's soil acidic or alkaline?
Coal County's soil has a low pH of 5.3, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Coal County?
Drainage class data is not currently available for Coal County.
What crops or plants grow well in Coal County's soil?
Based on Coal County's Water texture, pH of 5.3, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas.
What USDA soil order is found in Coal County?
The dominant USDA soil order for Coal County is not currently available in our dataset.
Planning your lawn? View lawn care data for Coal County on LawnByCounty.com →
Other Counties in Oklahoma
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.