Walla Walla County Soil Data
Walla Walla County, Washington
USDA SSURGO / PHZMAvg pH
N/A
Texture
Unknown
Drainage
N/A
Organic Matter
N/A
Hydrologic Group
N/A
Data Story
About Soil in Walla Walla County, Washington
Classic Valley Soil Profiles
Specific pH and taxonomic data for Walla Walla County are not listed in this dataset. Most regional soils trend near the state average pH of 6.20, though local volcanic influences often create unique chemical signatures.
Famous Loess and Texture
Exact sand, silt, and clay breakdowns are missing from the current records. The region is widely known for its wind-blown loess, which typically offers deep profiles and excellent workability for root development.
Renowned Agricultural Productivity
Local measurements for organic matter and available water capacity are currently unavailable. Despite these data gaps, the county's massive agricultural output confirms its reputation for superior fertility compared to state averages.
Natural Drainage Systems
Information regarding specific drainage classes is not recorded in the present data. Local farmers traditionally rely on deep, natural drainage systems to support the world-class viticulture the valley is famous for.
Sun-Drenched Zone 7a
Walla Walla sits in Zone 7a, a sweet spot for heat-loving crops like onions and wine grapes. This favorable hardiness zone makes the county an ideal location for a thriving home orchard or vineyard.
Soil Composition
Composition data not available for this county.
Soil pH
pH data not available for this county.
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: Unknown
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 Walla Walla County have?
Walla Walla County's soil is classified as Unknown. This indicates the relative proportions of sand, silt, and clay — sand percentage unavailable, silt percentage unavailable, and clay percentage unavailable. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Walla Walla County's soil acidic or alkaline?
pH data is not available for Walla Walla County.
What is the drainage class for Walla Walla County?
Drainage class data is not currently available for Walla Walla County.
What crops or plants grow well in Walla Walla County's soil?
Based on Walla Walla County's Unknown texture, soil pH, and drainage class, the soil is well suited for a variety of crops depending on local conditions.
What USDA soil order is found in Walla Walla County?
The dominant USDA soil order for Walla Walla County is not currently available in our dataset.
Soil & Planting Advisory: Walla Walla County
Soil Verdict
Walla Walla County is in USDA hardiness zone 7a, a moderate climate zone. where winter lows can reach 0°F. Mild winters mean soil rarely freezes deeply, allowing year-round microbial activity and faster organic matter breakdown.
Planting Guidance
Warm-season crops, citrus relatives, and heat-loving ornamentals do well. Cool-season vegetables should be planted in fall and winter. 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
Warm soils accelerate organic matter breakdown, so compost and mulch need replenishing more frequently than in cooler zones. Sandy soils common in warm zones drain quickly; water-retentive amendments like compost or peat help hold moisture. When soil temperatures drop below freezing, microbial nitrogen cycling stops; spring fertilization is more effective than late-fall application.
Regional Context
Walla Walla County closely matches the Washington average hardiness conditions. The zone range of 7a-7b within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Walla Walla County on LawnByCounty.com →
Other Counties in Washington
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.