Polk County Soil Data
Polk County, North Carolina
USDA SSURGO / PHZMAvg pH
5.2
Texture
Sandy Loam
Drainage
N/A
Organic Matter
2.0%
Hydrologic Group
N/A
Data Story
About Soil in Polk County, North Carolina
Balanced Acidity in Polk County
Polk County soil averages a pH of 5.24, placing it closer to the state average of 5.14 than the national median of 6.5. This acidic profile is characteristic of the region and influences which native plants thrive here.
A Blend of Sand and Clay
The composition consists of 57.7% sand, 21.7% silt, and a notable 16.9% clay content. This balance offers a sturdy structure for roots while maintaining enough sand for adequate drainage.
Stable Organic Content for Growth
Organic matter levels are measured at 1.99%, nearly hitting the national 2.0% benchmark but trailing the state average of 5.12%. The soil’s water capacity of 0.128 in/in is slightly below the North Carolina average of 0.134 in/in.
Navigating Moderate Permeability
Although specific drainage class and hydrologic group data are not available, the mix of sand and clay suggests a moderate permeability. Landowners should monitor for slower drainage in areas where clay concentrations are higher.
Heat-Tolerant Crops for Zone 8a
Zone 8a provides a long growing season for heat-tolerant crops like peppers and sweet potatoes. These plants flourish in the local climate, especially when the soil is enriched with organic compost.
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: Sandy Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Acidic Soil Detected
Your county's average pH is 5.2. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Polk County have?
Polk County's soil is classified as Sandy Loam. This indicates the relative proportions of sand, silt, and clay — 58% sand, 22% silt, and 17% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Polk County's soil acidic or alkaline?
Polk County's soil has a low pH of 5.2, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Polk County?
Drainage class data is not currently available for Polk County.
What crops or plants grow well in Polk County's soil?
Based on Polk County's Sandy Loam texture, pH of 5.2, 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 Polk County?
The dominant USDA soil order for Polk County is not currently available in our dataset.
Soil & Planting Advisory: Polk County
Soil Verdict
Polk County is in USDA hardiness zone 8a, a warm climate zone. where winter lows can reach 10°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. 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.
Regional Context
Polk County closely matches the North Carolina average hardiness conditions. The zone range of 7b-8a within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Polk County on LawnByCounty.com →
Other Counties in North Carolina
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.