Jasper County Soil Data
Jasper County, Iowa
USDA SSURGO / PHZMAvg pH
6.3
Texture
Silt Loam
Drainage
N/A
Organic Matter
2.9%
Hydrologic Group
N/A
Data Story
About Soil in Jasper County, Iowa
Jasper's Slightly Acidic Foundation
Jasper County maintains an average pH of 6.35, which is more acidic than the national median of 6.5. While detailed taxonomic data is limited for this region, the pH suggests a soil chemistry suited for many traditional Iowa crops.
Balanced Silt and Clay Mix
The soil composition is 52.4% silt, 24.2% clay, and 23.4% sand, creating a dense and nutrient-rich medium. This specific mix offers high fertility but may require careful management to prevent compaction during wet seasons.
Stable Organic Matter Levels
The county holds 2.94% organic matter, staying well above the national average of 2.0% but trailing the high Iowa state average of 3.81%. Its water capacity of 0.186 in/in ensures that crops stay hydrated even during dry spells.
Managing Jasper's Water Flow
Specific drainage and hydrologic class data is currently limited for this county. However, the 24.2% clay content suggests the soil retains moisture effectively, which is critical for local farming success.
Bountiful Options in Zone 5b
Jasper County sits in Hardiness Zone 5b, offering a slightly longer growing season than its northern neighbors. This soil is perfect for starting a home vegetable patch filled with tomatoes, peppers, and summer squash.
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
Browse products to improve your soil health and lawn performance.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Jasper County have?
Jasper County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 23% sand, 52% silt, and 24% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Jasper County's soil acidic or alkaline?
Jasper 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 Jasper County?
Drainage class data is not currently available for Jasper County.
What crops or plants grow well in Jasper County's soil?
Based on Jasper County's Silt 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 Jasper County?
The dominant USDA soil order for Jasper County is not currently available in our dataset.
Soil & Planting Advisory: Jasper County
Soil Verdict
Jasper County is in USDA hardiness zone 5b, a cold climate zone. where winter lows can reach -15°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
Jasper County closely matches the Iowa average hardiness conditions.
Planning your lawn? View lawn care data for Jasper County on LawnByCounty.com →
Other Counties in Iowa
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.