Mobile County Soil Data
Mobile County, Alabama
USDA SSURGO / PHZMAvg pH
5.0
Texture
Mucky peat
Drainage
Very poorly drained
Organic Matter
4.6%
Hydrologic Group
A/D
Data Story
About Soil in Mobile County, Alabama
Mobile's Highly Acidic Coastal Soils
Mobile County features a very acidic soil profile with an average pH of 5.01, which is significantly lower than the national median of 6.5. This level also falls below the Alabama state average of 5.21, suggesting that most local gardeners will need lime to balance their plots.
A Sandy Foundation for the Coast
The soil is dominated by 61.2% sand, complemented by 23.5% silt and a low 9.4% clay content. While this sandy mix offers excellent workability and ease of digging, it may struggle to retain essential nutrients compared to heavier soils.
Exceptional Organic Matter Levels
Mobile County boasts a high organic matter content of 4.56%, more than double the national average of 2.0%. The available water capacity of 0.146 in/in also exceeds the state average, providing a surprisingly strong reservoir for plant hydration.
Fast Drainage for Rainy Days
Although specific taxonomic data is unavailable, the high 61.2% sand concentration typically ensures rapid drainage during coastal storms. This helps prevent root rot but requires growers to monitor for nutrient leaching in the porous soil.
A Paradise for Acid-Loving Plants
The USDA hardiness zone 9a is perfect for citrus, azaleas, and camellias that thrive in acidic, high-organic environments. With such rich organic matter already present, your garden is well-positioned for a productive growing season.
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
Very poorly drained
Water is removed so slowly that free water remains at or on the surface most of the year. Typically wetland soils.
Soil Profile
Dominant texture: Mucky peat
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Acidic Soil Detected
Your county's average pH is 5.0. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Mobile County have?
Mobile County's soil is classified as Mucky peat. This indicates the relative proportions of sand, silt, and clay — 61% sand, 23% silt, and 9% clay. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Mobile County's soil acidic or alkaline?
Mobile County's soil has a low pH of 5.0, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Mobile County?
Mobile County has a dominant drainage class of "Very poorly drained." Poorly drained soils retain water for extended periods, which can limit crop choices and may require tile drainage or raised beds.
What crops or plants grow well in Mobile County's soil?
Based on Mobile County's Mucky peat texture, pH of 5.0, and Very poorly drained, the soil is well suited for acid-loving plants like blueberries and azaleas, rice, cranberries, and other water-tolerant species.
What USDA soil order is found in Mobile County?
Mobile County's dominant soil order is Histosols. Histosols are organic soils (peatlands and bogs) with very high organic matter content. They form in wet, poorly drained environments.
Soil & Planting Advisory: Mobile County
Soil Verdict
Mobile County is in USDA hardiness zone 9a, a warm climate zone. where winter lows can reach 20°F. Warm winters keep soil biology active nearly year-round, accelerating decomposition but increasing pest and disease pressure in topsoil.
Planting Guidance
Tropical and subtropical plants are viable. Year-round gardening is possible, though summer heat may limit some cool-season crops. Frost is rare; tender plants can overwinter with minimal protection. 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
Rapid organic matter turnover means soils can become nutrient-poor quickly; test annually and fertilize based on results. High soil temperatures favor certain soilborne pathogens; practice crop rotation and avoid overwatering.
Regional Context
Mobile County is somewhat warmer than the Alabama statewide average. The zone range of 8b-9b within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Mobile County on LawnByCounty.com →
Other Counties in Alabama
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.