Galveston County Soil Data
Galveston County, Texas
USDA SSURGO / PHZMAvg pH
6.8
Texture
Loam
Drainage
N/A
Organic Matter
3.1%
Hydrologic Group
D
Data Story
About Soil in Galveston County, Texas
Neutral Soils on the Gulf Coast
Galveston County boasts a nearly neutral pH of 6.76, which is very close to the national median of 6.5. Although specific soil order data is unavailable, this balanced pH supports a wide range of coastal vegetation. It provides a versatile foundation for both natural marshes and residential landscapes.
Balanced Texture for Coastal Life
The soil contains 46.2% sand, 27.1% silt, and 20.7% clay. This mix provides enough clay for nutrient retention while maintaining a manageable texture. It is a robust composition for supporting the heavy infrastructure of a coastal county.
Rich Organic Matter, Low Water Hold
Organic matter content is impressive at 3.05%, nearly doubling the state average of 1.66%. However, available water capacity is low at 0.092 in/in compared to the state’s 0.133 in/in average. The soil is rich in nutrients but may require frequent watering during dry spells.
Slow Infiltration Near the Shore
The county belongs to hydrologic group D, which means the soil has very low infiltration rates. This can lead to standing water after heavy Gulf storms, a critical factor for local builders. Proper drainage systems are a necessity for any gardening or construction project.
Subtropical Potential in Zone 9b
Hardiness Zone 9b allows for a lush, subtropical garden featuring palms and hibiscus. The high organic matter in the soil provides a head start for these hungry plants. Embrace the coastal climate by planting a diverse, salt-tolerant landscape.
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: Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Soil Amendment Products
Browse products to improve your soil health and lawn performance.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Galveston County have?
Galveston County's soil is classified as Loam. This indicates the relative proportions of sand, silt, and clay — 46% sand, 27% silt, and 21% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Galveston County's soil acidic or alkaline?
Galveston County's soil has a pH of 6.8, which is near neutral. This range is ideal for most garden plants and field crops.
What is the drainage class for Galveston County?
Drainage class data is not currently available for Galveston County.
What crops or plants grow well in Galveston County's soil?
Based on Galveston County's Loam texture, pH of 6.8, 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 Galveston County?
The dominant USDA soil order for Galveston County is not currently available in our dataset.
Soil & Planting Advisory: Galveston County
Soil Verdict
Galveston County is in USDA hardiness zone 9b, a warm climate zone. where winter lows can reach 25°F. Warm winters keep soil biology active nearly year-round, accelerating decomposition but increasing pest and disease pressure in topsoil.
Planting Guidance
Tropical and subtropical plants are viable. Year-round gardening is possible, though summer heat may limit some cool-season crops. Frost is rare; tender plants can overwinter with minimal protection. 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
Rapid organic matter turnover means soils can become nutrient-poor quickly; test annually and fertilize based on results. High soil temperatures favor certain soilborne pathogens; practice crop rotation and avoid overwatering.
Regional Context
Galveston County is somewhat warmer than the Texas statewide average. The zone range of 9b-10a within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Galveston 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.