Marion County Soil Data
Marion County, Oregon
USDA SSURGO / PHZMAvg pH
N/A
Texture
Unknown
Drainage
N/A
Organic Matter
N/A
Hydrologic Group
N/A
Data Story
About Soil in Marion County, Oregon
The heart of Oregon agriculture
Specific pH and taxonomic data for Marion County are not currently available in our dataset. Local soils generally mirror the Willamette Valley’s acidic profile, which averages 5.26 compared to the 6.5 national median. This acidic base is what makes the region so productive for iconic Oregon crops.
A foundation for nursery crops
We do not have specific percentages for sand, silt, and clay for Marion County at this time. These factors influence how well your soil handles the heavy winter rains and the dry summer heat. Understanding your soil's texture can help you manage drainage and plant health more effectively.
Inheriting Valley fertility
While specific organic matter data for the county is missing, the Oregon average of 29.41% is incredibly high compared to the 2.0% national average. Marion County is famous for its productive farmland and lush nurseries. Your soil likely contains the rich nutrients needed to grow world-class plants.
Managing the Valley's water
Specific drainage classes and hydrologic groups are not listed in the current regional records. Observing your property during a winter storm is the best way to see how water moves across the land. Proper drainage management will keep your garden from becoming waterlogged during the rainy season.
Unlimited potential in Zone 8b
In Hardiness Zone 8b, Marion County offers one of the best growing environments in the nation. You can find success with everything from hazelnuts and berries to ornamental shrubs and vegetables. Start your garden today and become part of the county's rich agricultural tradition.
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 Marion County have?
Marion 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 Marion County's soil acidic or alkaline?
pH data is not available for Marion County.
What is the drainage class for Marion County?
Drainage class data is not currently available for Marion County.
What crops or plants grow well in Marion County's soil?
Based on Marion 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 Marion County?
The dominant USDA soil order for Marion County is not currently available in our dataset.
Soil & Planting Advisory: Marion County
Soil Verdict
Marion County is in USDA hardiness zone 8b, a warm climate zone. where winter lows can reach 15°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. 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.
Regional Context
Marion County is somewhat warmer than the Oregon statewide average. The zone range of 7b-8b within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Marion County on LawnByCounty.com →
Other Counties in Oregon
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.