Winneshiek County Soil Data
Winneshiek County, Iowa
Avg pH
6.3
Texture
Loamy fine sand
Drainage
Excessively drained
Organic Matter
3.7%
Hydrologic Group
A
Data Story
About Soil in Winneshiek County, Iowa
Mollisols and Loamy Fine Sands
Winneshiek County is characterized by Mollisols, the deep, dark, fertile soils of the grasslands. The dominant texture is loamy fine sand, and the average pH is 6.34, just under the national median. These soils are famous for their historical productivity and natural wealth.
Sandier Soil for Superior Aeration
With 30.4% sand and a high 49.4% silt content, this soil is exceptionally easy to till and manage. The clay content is relatively low at 19.3%, which means it doesn't get as sticky as other Iowa soils. This creates a light, breathable environment that encourages rapid root expansion.
Classic Iowa Fertility Levels
The organic matter in Winneshiek stands at 3.72%, nearly matching the state average of 3.81%. Available water capacity is also exactly at the state average of 0.195 in/in. These metrics indicate a very reliable and balanced soil that is well-suited for traditional Midwestern farming.
Rapid Drainage in Hydrologic Group A
Classified as excessively drained and part of hydrologic group A, water moves very quickly through this soil. This reduces the risk of root rot but may require more frequent irrigation during peak summer heat. It is a fantastic soil for construction and gardening, as it dries out quickly after a storm.
Perfect for Cold-Hardy Specialties
Winneshiek's Zone 5a climate and well-drained loamy sand are ideal for specialty crops like grapes or berries. The soil's tendency to dry quickly makes it perfect for plants that dislike 'wet feet.' Plant your orchard or vineyard here and watch it thrive in the rich Mollisol base.
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
Excessively drained
Water is removed very rapidly. Very sandy or gravelly soils with little water retention.
Soil Profile
Dominant texture: Loamy fine sand
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Winneshiek County have?
Winneshiek County's soil is classified as Loamy fine sand. This indicates the relative proportions of sand, silt, and clay — 30% sand, 49% silt, and 19% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Winneshiek County's soil acidic or alkaline?
Winneshiek 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 Winneshiek County?
Winneshiek County has a dominant drainage class of "Excessively drained." Moderate drainage allows adequate moisture retention while still permitting excess water to drain over time.
What crops or plants grow well in Winneshiek County's soil?
Based on Winneshiek County's Loamy fine sand texture, pH of 6.3, and Excessively drained, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens.
What USDA soil order is found in Winneshiek County?
Winneshiek County's dominant soil order is Mollisols. Mollisols are fertile, dark-colored soils that formed under grassland vegetation. They are among the most productive agricultural soils in the world.
Planning your lawn? View lawn care data for Winneshiek 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.