Seminole County Soil Data
Seminole County, Oklahoma
Avg pH
5.8
Texture
Water
Drainage
N/A
Organic Matter
1.3%
Hydrologic Group
D
Data Story
About Soil in Seminole County, Oklahoma
Seminole County's Naturally Acidic Profile
With an average pH of 5.76, Seminole County soil is more acidic than the national median of 6.5. This level also falls slightly below the Oklahoma state average of 6.06. Growers should expect to manage acidity to unlock full nutrient availability for most garden vegetables.
Sandy Texture with Moderate Clay
The soil contains 44.0% sand, 28.9% silt, and 16.1% clay. While the dominant texture is listed as water-influenced, the physical breakdown suggests a medium-textured soil that drains reasonably well. The 16.1% clay content provides enough structure to prevent the soil from becoming overly loose.
Moderate Fertility and Water Capacity
Organic matter is recorded at 1.32%, which is lower than the state average of 1.72%. The available water capacity of 0.142 in/in is nearly identical to the Oklahoma average of 0.144 in/in. This suggests reliable, though not exceptional, growing potential for native and adapted species.
Managing High Runoff in Group D
The county is classified under Hydrologic Group D, indicating soils with high runoff potential when wet. These soils typically have low infiltration rates, which can lead to standing water during heavy Oklahoma spring storms. Planning for raised beds or drainage ditches can help mitigate these hydrological hurdles.
Gardening Success in Zone 7b
Zone 7b offers a long growing season that pairs well with the county's moderate water capacity. Heat-loving crops like sweet potatoes and peppers thrive in this climate. Adding organic compost will help bridge the gap between the local 1.32% organic matter and the national ideal.
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 Seminole County have?
Seminole County's soil is classified as Water. This indicates the relative proportions of sand, silt, and clay — 44% sand, 29% silt, and 16% clay. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Seminole County's soil acidic or alkaline?
Seminole County's soil has a pH of 5.8, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Seminole County?
Drainage class data is not currently available for Seminole County.
What crops or plants grow well in Seminole County's soil?
Based on Seminole County's Water texture, pH of 5.8, and drainage class, the soil is well suited for vegetables, grains, and most field crops.
What USDA soil order is found in Seminole County?
The dominant USDA soil order for Seminole County is not currently available in our dataset.
Planning your lawn? View lawn care data for Seminole 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.