Cobb County Soil Data
Cobb County, Georgia
Avg pH
5.5
Texture
Sandy loam
Drainage
Well drained
Organic Matter
1.4%
Hydrologic Group
D
Data Story
About Soil in Cobb County, Georgia
Acidic Alfisols define Cobb County's ground
Cobb County features Alfisols with a pH of 5.52, which is more acidic than the national median of 6.5. Despite the acidity, it is less sour than the Georgia state average of 5.26, providing a slightly better baseline for local growers.
Sandy loam provides the perfect texture
The soil consists of 52.7% sand, 27.6% silt, and 19.2% clay, creating a versatile sandy loam texture. This composition offers a balanced mix of easy workability for gardeners and sufficient clay to retain necessary minerals.
Strong water capacity offsets lower organic matter
At 1.39%, the organic matter content is lower than the state average of 1.83% and the national 2.0% benchmark. However, its available water capacity of 0.133 in/in beats the state average of 0.114, ensuring plants stay hydrated longer.
Well-drained soils with high runoff potential
These soils are classified as well drained, yet they fall into hydrologic group D, which indicates a high risk of runoff. This means while roots won't rot in standing water, heavy rains require careful management to prevent erosion.
A prime spot for Zone 8a gardening
With a high soil score of 23.1 compared to the state average of 17.6, Cobb is an excellent place to plant. In hardiness zone 8a, you can expect great success with azaleas, blueberries, and heat-loving summer vegetables.
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
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
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 Cobb County have?
Cobb County's soil is classified as Sandy loam. This indicates the relative proportions of sand, silt, and clay — 53% sand, 28% silt, and 19% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Cobb County's soil acidic or alkaline?
Cobb County's soil has a pH of 5.5, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Cobb County?
Cobb County has a dominant drainage class of "Well drained." Well-drained soils allow excess water to move through quickly, reducing waterlogging risk and supporting most field and garden crops.
What crops or plants grow well in Cobb County's soil?
Based on Cobb County's Sandy loam texture, pH of 5.5, and Well drained, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Cobb County?
Cobb County's dominant soil order is Alfisols. Alfisols are moderate to high base-status soils with a clay-enriched subsoil. They support productive forests and cropland across temperate regions.
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Other Counties in Georgia
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.