Marion County Soil Data
Marion County, Ohio
USDA SSURGO / PHZMAvg pH
6.3
Texture
Loam
Drainage
N/A
Organic Matter
4.8%
Hydrologic Group
N/A
Data Story
About Soil in Marion County, Ohio
Neutral pH Levels Benefit Local Crops
Marion County boasts an average pH of 6.32, which is very close to the national median of 6.5. This level is significantly higher than the Ohio average of 5.97, making it naturally suited for many regional crops. While taxonomic data is limited, the chemical profile indicates a highly productive landscape.
Clay Content Increases Nutrient Retention
With 24.8% clay and 48.1% silt, Marion's soil is slightly heavier and more nutrient-dense than some neighboring counties. The 24.2% sand content helps provide some porosity for air movement. This composition creates a soil that holds onto fertilizers and minerals effectively.
High Water Capacity Supports Growth
The available water capacity is 0.201 in/in, which exceeds the state average of 0.186. Organic matter is measured at 4.75%, sitting just below the state average of 4.85%. Despite the slightly lower organic matter, the superior water storage capacity provides a safety net during dry summers.
Understanding Local Hydrologic Patterns
Specific drainage class data is currently limited for this area, requiring on-site testing for large projects. However, the soil's composition suggests a tendency to retain moisture, which often necessitates managed drainage in agricultural fields. Local builders should assess site-specific conditions before beginning construction.
Productive Gardening in Zone 6a
The 6a hardiness zone allows for a long growing season for tomatoes, peppers, and sweet corn. With a near-neutral pH, you can grow a vast array of flowers and vegetables without heavy soil amendments. Grab a shovel and start planting to take advantage of this balanced soil.
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
Soil Amendment Products
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Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Marion County have?
Marion County's soil is classified as Loam. This indicates the relative proportions of sand, silt, and clay — 24% sand, 48% silt, and 25% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Marion County's soil acidic or alkaline?
Marion County's soil has a pH of 6.3, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Marion County?
Drainage class data is not currently available for Marion County.
What crops or plants grow well in Marion County's soil?
Based on Marion County's Loam texture, pH of 6.3, and drainage class, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens.
What USDA soil order is found in Marion County?
The dominant USDA soil order for Marion County is not currently available in our dataset.
Soil & Planting Advisory: Marion County
Soil Verdict
Marion County is in USDA hardiness zone 6a, a moderate climate zone. where winter lows can reach -10°F. Freeze-thaw cycles are moderate; soil biology slows in winter but recovers reliably in spring, supporting a broad range of plants.
Planting Guidance
A wide plant palette is possible: deciduous trees, most shrubs, cool-season vegetables, and many perennials thrive here. 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
Moderate freeze-thaw cycles naturally aerate the soil but can also cause compaction in clay-heavy areas; annual core aeration is beneficial. Organic matter amendments decompose at a moderate pace — aim for 3-5% organic content for optimal fertility. When soil temperatures drop below freezing, microbial nitrogen cycling stops; spring fertilization is more effective than late-fall application.
Regional Context
Marion County closely matches the Ohio average hardiness conditions.
Planning your lawn? View lawn care data for Marion County on LawnByCounty.com →
Other Counties in Ohio
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.