Hamilton County Soil Data
Hamilton County, Indiana
USDA SSURGO / PHZMAvg pH
6.2
Texture
Silt Loam
Drainage
N/A
Organic Matter
5.7%
Hydrologic Group
N/A
Data Story
About Soil in Hamilton County, Indiana
High-performing soils in a central hub
Hamilton County boasts a superior soil score of 82.2, significantly higher than the Indiana average of 71.4. Its average pH of 6.21 is slightly acidic but remains closer to the 6.5 national median than many other counties. While texture and taxonomic data are limited, the chemical profile indicates elite growing conditions.
Silt-heavy mix creates a fertile foundation
The soil composition is 51.9% silt, 22.7% sand, and 20.6% clay. This balanced distribution provides excellent moisture retention without the extreme density of pure clay. It creates a medium-textured soil that supports robust root development and nutrient storage.
Rich organic matter and superior hydration
At 5.72%, the organic matter content in Hamilton County beats the state average of 4.90% and nearly triples the national average. The available water capacity of 0.213 in/in is also higher than the state average of 0.202. This means the soil is exceptionally resilient during Indiana's summer dry spells.
Productive land with high water storage
Though specific drainage classifications are not listed, the high water capacity and silt content suggest a moisture-retentive landscape. This soil is capable of supporting intensive agriculture or lush residential landscaping. The high soil score reflects a landscape that is naturally primed for high performance.
Lush landscapes flourish in Zone 6a
Hamilton County's 6a hardiness zone is perfect for everything from turfgrass to heirloom tomatoes. The high organic matter means you can grow nutrient-dense vegetables with less supplemental fertilizer. It is an ideal environment to establish a high-yield home garden.
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: Silt 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 Hamilton County have?
Hamilton County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 23% sand, 52% silt, and 21% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Hamilton County's soil acidic or alkaline?
Hamilton County's soil has a pH of 6.2, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Hamilton County?
Drainage class data is not currently available for Hamilton County.
What crops or plants grow well in Hamilton County's soil?
Based on Hamilton County's Silt Loam texture, pH of 6.2, 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 Hamilton County?
The dominant USDA soil order for Hamilton County is not currently available in our dataset.
Soil & Planting Advisory: Hamilton County
Soil Verdict
Hamilton 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
Hamilton County closely matches the Indiana average hardiness conditions.
Planning your lawn? View lawn care data for Hamilton County on LawnByCounty.com →
Other Counties in Indiana
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.