St. Louis city Soil Data
St. Louis city, Missouri
USDA SSURGO / PHZMAvg pH
N/A
Texture
Unknown
Drainage
N/A
Organic Matter
N/A
Hydrologic Group
N/A
Data Story
About Soil in St. Louis city, Missouri
The Urban Soil Frontier
As a highly developed urban area, St. Louis city lacks the traditional taxonomic and pH data found in rural counties. However, its placement in the Mississippi River corridor suggests a historical legacy of rich alluvial deposits.
Built Environments and Modified Earth
Native soil composition percentages for sand and clay are currently unavailable due to extensive urban development. Urban soils here are often a mix of original silt loams and imported fill materials used for city construction.
Cultivating the Urban Forest
While specific organic matter percentages are not recorded, urban gardens often require supplemental compost to reach peak productivity. The city shares the region's overall high potential for plant growth despite the lack of formal AWC data.
Managing Runoff in the City
Drainage in the city is heavily influenced by man-made infrastructure rather than natural soil classes. Gardeners should watch for 'urban karst' or compaction that can lead to localized drainage issues during heavy Missouri storms.
Thriving in a Warmer Zone 7a
The city's concrete heat island effect helps push it into Hardiness Zone 7a, allowing for a longer growing season than surrounding areas. This is a perfect environment for vibrant community gardens and diverse urban landscaping.
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 St. Louis city have?
St. Louis city'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 St. Louis city's soil acidic or alkaline?
pH data is not available for St. Louis city.
What is the drainage class for St. Louis city?
Drainage class data is not currently available for St. Louis city.
What crops or plants grow well in St. Louis city's soil?
Based on St. Louis city'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 St. Louis city?
The dominant USDA soil order for St. Louis city is not currently available in our dataset.
Soil & Planting Advisory: St. Louis city
Soil Verdict
St. Louis city 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
St. Louis city is somewhat warmer than the Missouri statewide average.
Planning your lawn? View lawn care data for St. Louis city on LawnByCounty.com →
Other Counties in Missouri
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.