Armstrong County Soil Data
Armstrong County, Texas
USDA SSURGO / PHZMAvg pH
7.7
Texture
Loamy fine sand
Drainage
Moderately well drained
Organic Matter
1.6%
Hydrologic Group
A
Data Story
About Soil in Armstrong County, Texas
Alkaline Loamy Sands of Armstrong
The dominant soil in Armstrong County is a loamy fine sand with an alkaline pH of 7.68. This is higher than the national median of 6.5 and exceeds the Texas average of 7.09. Such alkalinity is common in the Panhandle and may require specific plant selections that tolerate high calcium.
Granular Texture for Easy Working
The composition features 43.9% sand, 29.8% silt, and 24.9% clay. This blend creates a texture that is easy to till while still providing enough clay to hold nutrients. It offers a unique middle ground between the heavy clays and the very sandy soils found elsewhere in the state.
Superior Water Retention Ability
Available water capacity is a high 0.151 in/in, beating the state average of 0.133 by a healthy margin. Organic matter is 1.56%, which is slightly below the state average of 1.66%. Despite the lower organic levels, the soil's ability to hold water makes it very resilient for agriculture.
Fast-Infiltrating Hydrologic Group A
The soil is moderately well drained and belongs to Hydrologic Group A, indicating very low runoff potential. Water moves quickly into the ground, which is ideal for recharging aquifers and preventing erosion. This is a significant advantage for both large-scale farming and home landscaping.
Cooler Climates in Zone 7a
Armstrong County is in Zone 7a, experiencing colder winters than much of the state. This climate and the loamy soil are perfect for hearty crops like winter wheat and resilient native shrubs. It is an excellent environment for gardeners who value fast-draining, water-efficient soil.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group A — Low Runoff
Sandy, well-drained soils with high infiltration rates. Water moves quickly through the soil profile. Lowest runoff potential when thoroughly wetted.
Drainage Class
Moderately well drained
Water is removed somewhat slowly. May have a slowly permeable layer or seasonal water table.
Soil Profile
Dominant texture: Loamy fine sand
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Alkaline Soil Detected
Your county's average pH is 7.7. These products help acidify soil for better nutrient uptake.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Armstrong County have?
Armstrong County's soil is classified as Loamy fine sand. This indicates the relative proportions of sand, silt, and clay — 44% sand, 30% silt, and 25% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Armstrong County's soil acidic or alkaline?
Armstrong County's soil has a pH of 7.7, which is mildly to moderately alkaline. Sulfur amendments can lower pH if needed.
What is the drainage class for Armstrong County?
Armstrong County has a dominant drainage class of "Moderately 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 Armstrong County's soil?
Based on Armstrong County's Loamy fine sand texture, pH of 7.7, and Moderately 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 Armstrong County?
The dominant USDA soil order for Armstrong County is not currently available in our dataset.
Soil & Planting Advisory: Armstrong County
Soil Verdict
Armstrong County is in USDA hardiness zone 7a, a moderate climate zone. where winter lows can reach 0°F. Mild winters mean soil rarely freezes deeply, allowing year-round microbial activity and faster organic matter breakdown.
Planting Guidance
Warm-season crops, citrus relatives, and heat-loving ornamentals do well. Cool-season vegetables should be planted in fall and winter. Winter protection (mulch, burlap wraps) helps push the zone boundary for desired species. 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
Warm soils accelerate organic matter breakdown, so compost and mulch need replenishing more frequently than in cooler zones. Sandy soils common in warm zones drain quickly; water-retentive amendments like compost or peat help hold moisture. When soil temperatures drop below freezing, microbial nitrogen cycling stops; spring fertilization is more effective than late-fall application.
Regional Context
Armstrong County is somewhat cooler than the Texas statewide average.
Planning your lawn? View lawn care data for Armstrong 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.