Montgomery County Soil Data
Montgomery County, Maryland
Avg pH
5.4
Texture
Silt loam
Drainage
N/A
Organic Matter
4.4%
Hydrologic Group
C/D
Data Story
About Soil in Montgomery County, Maryland
Silty Ultisols of the Piedmont
Montgomery County is defined by Ultisols with a dominant silt loam texture and a pH of 5.42. This pH is healthier than the state average of 5.31, though still more acidic than the national 6.5 median. These soils are characteristic of the rolling hills found just north of the capital.
Silt-heavy soil with moderate clay
The soil contains a high silt percentage of 51.6%, mixed with 17.1% clay and 27.7% sand. This high silt content can make the soil feel very smooth but also prone to erosion if left uncovered. The 17.1% clay provides good nutrient-holding capacity but can lead to compaction.
Efficient water storage despite lower organic matter
At 4.40%, the organic matter is lower than the Maryland average of 9.10% but still double the national average of 2.0%. However, the available water capacity is a robust 0.187 in/in, which is higher than the state average of 0.175. This helps maintain plant health even when rain is scarce.
Slower infiltration in group C/D
The soil belongs to hydrologic group C/D, indicating a somewhat slow rate of water transmission. While specific drainage classes aren't listed, this group often requires attention to drainage in home gardens. Avoid working this soil when it is overly wet to prevent damaging its structure.
Gardening success in Zone 7b
Montgomery County's 7b zone and silt loam provide a great foundation for a diverse home garden. The 0.187 available water capacity means your plants are well-protected against short droughts. Focus on adding compost to improve the 4.40% organic matter and you'll see a massive boost in your harvest.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group C — Moderate-High Runoff
Soils with slow infiltration rates, often with a layer that impedes downward water movement. Higher clay content restricts drainage.
Drainage Class
Drainage class data not available.
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 Montgomery County have?
Montgomery County's soil is classified as Silt loam. This indicates the relative proportions of sand, silt, and clay — 28% sand, 52% silt, and 17% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Montgomery County's soil acidic or alkaline?
Montgomery County's soil has a low pH of 5.4, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Montgomery County?
Drainage class data is not currently available for Montgomery County.
What crops or plants grow well in Montgomery County's soil?
Based on Montgomery County's Silt loam texture, pH of 5.4, 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 Montgomery County?
Montgomery County's dominant soil order is Ultisols. Ultisols are highly weathered, clay-rich soils common in humid regions. They are low in natural fertility and often require lime and fertilizer for agriculture.
Planning your lawn? View lawn care data for Montgomery County on LawnByCounty.com →
Other Counties in Maryland
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.