Irion County Soil Data
Irion County, Texas
Avg pH
8.0
Texture
Silt loam
Drainage
Well drained
Organic Matter
2.8%
Hydrologic Group
B
Data Story
About Soil in Irion County, Texas
High-alkalinity Alfisols of Irion
Irion County has a significantly alkaline soil pH of 8.02, far exceeding the national median of 6.5. These Alfisols are common in this part of the Edwards Plateau and are more alkaline than the Texas average of 7.09. This chemical profile requires gardeners to select plants that can tolerate high calcium levels.
Silty textures and fine clay
Dominant silt loam textures define the area, with silt comprising 46.4% of the soil. This is balanced by 31.1% clay and a lower sand content of 22.5%, resulting in a soil that feels smooth and holds moisture well. The high silt and clay percentages provide excellent nutrient-holding capacity for local flora.
Exceptional organic matter levels
At 2.77%, the organic matter in Irion County is much higher than the Texas average of 1.66% and even exceeds the national average. The available water capacity is also strong at 0.144 in/in, surpassing the state benchmark. These numbers indicate a surprisingly rich soil foundation for a semi-arid region.
Superior drainage for plateau life
The soil is classified as well-drained and falls into hydrologic group B, meaning it has a moderate infiltration rate when wet. This is superior for most agricultural uses as it prevents waterlogging while still absorbing rainfall effectively. This makes the county particularly well-suited for ranching and native range management.
Resilient growth in Zone 8a
USDA Hardiness Zone 8a supports hardy plants like Texas persimmon, agarita, and drought-resistant herbs like sage. The high organic matter gives gardeners a head start on producing robust native landscapes or vegetable plots. Plant your roots in Irion County and watch these fertile silts perform.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group B — Moderate Runoff
Moderately deep, moderately well-drained soils with moderate infiltration rates. Good balance of drainage and water retention.
Drainage Class
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Silt loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Irion County have?
Irion County's soil is classified as Silt loam. This indicates the relative proportions of sand, silt, and clay — 23% sand, 46% silt, and 31% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Irion County's soil acidic or alkaline?
Irion County's soil has a pH of 8.0, which is mildly to moderately alkaline. Sulfur amendments can lower pH if needed.
What is the drainage class for Irion County?
Irion 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 Irion County's soil?
Based on Irion County's Silt loam texture, pH of 8.0, and Well drained, the soil is well suited for drought-tolerant crops and native grasses, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Irion County?
Irion 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.
Planning your lawn? View lawn care data for Irion 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.