Grayson County Soil Data
Grayson County, Virginia
USDA SSURGO / PHZMAvg pH
5.3
Texture
Loam
Drainage
N/A
Organic Matter
5.4%
Hydrologic Group
N/A
Data Story
About Soil in Grayson County, Virginia
Typical mountain acidity with high quality
Grayson County has an average soil pH of 5.25, which closely mirrors the Virginia state average of 5.23. Though more acidic than the national median of 6.5, this soil earns a high score of 46.9, far exceeding the state average of 30.6.
Loamy textures with excellent silt balance
The soil contains 46.6% sand and a high 37.9% silt content, creating a rich texture for plant roots. With 14.5% clay, the composition is ideal for retaining nutrients while still allowing for adequate aeration.
Exceptional organic matter leads the state
Grayson County boasts a remarkable 5.37% organic matter content, nearly double the state average of 2.90%. This rich material, combined with a high water capacity of 0.165 in/in, makes this some of the most fertile ground in the region.
Superior water holding for lush landscapes
The high silt and organic matter levels indicate that these soils are excellent at managing moisture without becoming waterlogged. This natural hydration supports the county's famous pastures and vibrant forest ecosystems year-round.
Zone 7a is a gardener's paradise
With such high organic matter, your soil is already prepared for success with heavy feeders like corn and pumpkins. Grayson's climate and superior soil score make it one of the best places in Virginia to start a homestead.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Hydrologic group data not available.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Acidic Soil Detected
Your county's average pH is 5.3. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Grayson County have?
Grayson County's soil is classified as Loam. This indicates the relative proportions of sand, silt, and clay — 47% sand, 38% silt, and 14% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Grayson County's soil acidic or alkaline?
Grayson County's soil has a low pH of 5.3, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Grayson County?
Drainage class data is not currently available for Grayson County.
What crops or plants grow well in Grayson County's soil?
Based on Grayson County's Loam texture, pH of 5.3, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas, row crops and vegetable gardens.
What USDA soil order is found in Grayson County?
The dominant USDA soil order for Grayson County is not currently available in our dataset.
Soil & Planting Advisory: Grayson County
Soil Verdict
Grayson 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
Grayson County closely matches the Virginia average hardiness conditions. The zone range of 6b-7a within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Grayson County on LawnByCounty.com →
Other Counties in Virginia
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.