Washington County Soil Data
Washington County, Idaho
USDA SSURGO / PHZMAvg pH
N/A
Texture
Unknown
Drainage
N/A
Organic Matter
N/A
Hydrologic Group
N/A
Data Story
About Soil in Washington County, Idaho
Transitional Soils of the Snake River Basin
Washington County lacks specific pH and taxonomic data, but local conditions often mirror the Idaho state average of 6.04. This puts the soil slightly below the national median pH of 6.5, a common trait for the region's semi-arid landscapes. These soils provide a versatile foundation for both orchards and rangeland.
Diverse Textures Across Valleys and Hills
Exact percentages for sand, silt, and clay are not currently indexed for the county. This unrecorded mix dictates the soil's workability and how it interacts with the region's limited rainfall. Local growers should evaluate their specific texture to optimize drainage and ensure proper nutrient delivery.
Building Growth on Idaho State Benchmarks
In the absence of local data, the state average of 27.53% organic matter represents the ideal for soil fertility. Gardeners should strive for an available water capacity near the 0.269 in/in state average to support healthy crop development. Strong fertility is the secret behind the county's reputation for high-quality fruit production.
Water Management in a Sun-Drenched County
Official drainage and hydrologic group classifications are missing, but the proximity to the Snake River influences local water tables. Understanding how your land handles irrigation and spring runoff is crucial for successful farming and construction. Proper drainage planning keeps your soil productive and your structures sound.
Thriving in Washington’s Warm Zone 7a
Washington County boasts a robust Hardiness Zone 7a, the warmest in this group, making it ideal for peaches and melons. The extended growing season allows for a wide variety of heat-loving vegetables and perennials. Take advantage of this favorable climate to start your most ambitious garden yet.
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
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Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Washington County have?
Washington 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 Washington County's soil acidic or alkaline?
pH data is not available for Washington County.
What is the drainage class for Washington County?
Drainage class data is not currently available for Washington County.
What crops or plants grow well in Washington County's soil?
Based on Washington 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 Washington County?
The dominant USDA soil order for Washington County is not currently available in our dataset.
Soil & Planting Advisory: Washington County
Soil Verdict
Washington 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
Washington County is somewhat warmer than the Idaho statewide average. The zone range of 6a-7a within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Washington County on LawnByCounty.com →
Other Counties in Idaho
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.