San Juan County Soil Data
San Juan County, Utah
USDA SSURGO / PHZMAvg pH
N/A
Texture
Unknown
Drainage
N/A
Organic Matter
N/A
Hydrologic Group
N/A
Data Story
About Soil in San Juan County, Utah
Red rocks and alkaline desert soils
Local pH measurements are not yet recorded, but they typically exceed the national 6.5 median in this arid landscape. The soil reflects the deep geological history of the Colorado Plateau.
Sand and silt define the canyonlands
Specific composition percentages are missing, though the region is famous for its sandy textures. These materials provide great drainage but often struggle to hold onto vital nutrients.
Low organic matter requires active management
Without specific county numbers, the 2.0% national organic matter average is a more likely baseline than the state average. Focus on building up soil health to overcome the dry, high-desert conditions.
Flash floods highlight drainage importance
Official drainage groups are unmapped, requiring landowners to observe their own site's runoff patterns. Rapid drainage is common in sandy patches, making frequent, light watering necessary for crops.
Thriving in a sunny Zone 7a
Grapes and fruit trees flourish with the long growing season and abundant sunlight. Protect your young plants from the intense desert sun to ensure a successful harvest.
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 San Juan County have?
San Juan 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 San Juan County's soil acidic or alkaline?
pH data is not available for San Juan County.
What is the drainage class for San Juan County?
Drainage class data is not currently available for San Juan County.
What crops or plants grow well in San Juan County's soil?
Based on San Juan 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 San Juan County?
The dominant USDA soil order for San Juan County is not currently available in our dataset.
Soil & Planting Advisory: San Juan County
Soil Verdict
San Juan 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
San Juan County is somewhat warmer than the Utah statewide average. The zone range of 6b-7a within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for San Juan County on LawnByCounty.com →
Other Counties in Utah
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.