Smith County Soil Data
Smith County, Texas
Avg pH
5.3
Texture
Sandy Loam
Drainage
N/A
Organic Matter
1.1%
Hydrologic Group
D
Data Story
About Soil in Smith County, Texas
The Acidic Character of East Texas
Smith County soils are distinctly acidic with an average pH of 5.31, falling far below the national median of 6.5 and the state average of 7.09. This low pH defines the region's agricultural identity and determines which specialty crops thrive. These conditions are typical for the Piney Woods region where leaching is more frequent.
Dominated by Course Sandy Grains
The soil is overwhelmingly sandy at 63.8%, paired with a low clay content of only 10.7%. This coarse mix ensures excellent aeration but often leads to rapid nutrient leaching and fast drainage. Gardeners will notice the soil is easy to till but dries out quickly during the summer heat.
Low Organic Matter Challenges
Organic matter levels average 1.08%, which is significantly lower than the Texas average of 1.66%. The available water capacity is also low at 0.105 in/in, falling short of the state benchmark of 0.133 in/in. These numbers suggest that frequent composting and mulching are essential to maintain soil productivity.
Low Infiltration in Group D
Despite the sandy texture, the soil is classified in Hydrologic Group D, suggesting restricted water movement through the deeper layers. This can lead to surprising surface saturation despite the fast-draining surface sand. Site planning for buildings and gardens must account for this complex water behavior.
A Paradise for Acid-Loving Plants
Located in Hardiness Zone 8b, Smith County is famous for its roses and blueberries which love the naturally acidic soil. Azaleas and camellias also thrive here, making it a dream for ornamental gardeners. With proper irrigation and organic additions, your East Texas garden can be incredibly lush.
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: Sandy Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Smith County have?
Smith County's soil is classified as Sandy Loam. This indicates the relative proportions of sand, silt, and clay — 64% sand, 18% silt, and 11% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Smith County's soil acidic or alkaline?
Smith 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 Smith County?
Drainage class data is not currently available for Smith County.
What crops or plants grow well in Smith County's soil?
Based on Smith County's Sandy Loam texture, pH of 5.3, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas, row crops and vegetable gardens.
What USDA soil order is found in Smith County?
The dominant USDA soil order for Smith County is not currently available in our dataset.
Planning your lawn? View lawn care data for Smith County on LawnByCounty.com →
Other Counties in Texas
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.