California Extension & Soil Testing Directory
Find your local California County Cooperative Extension office, official state university soil analysis lab, and Master Gardener volunteer plant clinics.
🔬 State Soil Testing Laboratory
Official Lab: UC Davis Analytical Laboratory
Standard Fee: $20 routine soil fertility analysis
Turnaround Time: 7 to 10 business days
State residents can obtain soil sample bags and submittal forms at any local county extension branch.
🌱 State Growing Conditions
Soil Types: Sacramento Valley Clay Loam and Alluvial Silt Loam
Hardiness Zones: Zone 9b
Popular Crops: Tomatoes, citrus, figs, avocados, stone fruit, cool-season greens
Sacramento soils benefit from organic mulch to reduce summer evaporative water loss.
Featured County Directories in California (3 Listings)
Sacramento County
Extension Office: UC Cooperative Extension - Sacramento County
Soil Lab Fee: $20 routine soil fertility analysis
Phone: (916) 875-6913
Los Angeles County
Extension Office: UC Cooperative Extension - Los Angeles County
Soil Lab Fee: $20 routine soil fertility kit
Phone: (626) 586-1971
San Diego County
Extension Office: UC Cooperative Extension - San Diego County
Soil Lab Fee: $20 per routine soil sample
Phone: (858) 822-7711
Looking for Another County in California?
Every county in California is supported by the state Land-Grant University Extension system. If your specific county directory is currently being indexed, you can submit your soil samples directly to UC Davis Analytical Laboratory or contact our editorial desk for direct local office hours.
Request Local Extension Info for Your CountyFrequently Asked Questions: California Soil & Extension
How do I get my soil tested in California?
To test your soil in California, collect 10 to 12 soil cores from a depth of 4 to 6 inches across your garden or field, air-dry the sample indoors, fill out your county extension submission form, and submit it to UC Davis Analytical Laboratory or your local county extension office.
How much does soil testing cost in California?
Routine soil fertility analysis in California typically costs $20 routine soil fertility analysis. Turnaround time for results is usually 7 to 10 business days.
Does every county in California have a Cooperative Extension Office?
Yes. Every county in California is served by the state's Land-Grant University Extension system. While our directory highlights primary regional office hubs and university labs, local extension agents serve horticulturists, farmers, and home gardeners across all counties in California.
Written & Verified by Sahajul
Verified Author & Founder
Sahajul is an independent agricultural data researcher based in India and founder of LocalSoilLab.com. He specializes in compiling, structuring, and verifying US land-grant university extension services, soil lab testing fee schedules, and county Master Gardener contact directories directly from official .edu and USDA NIFA portals.