Los Angeles County, CA Extension Office & Soil Testing Directory
Welcome to the official directory resource for Los Angeles County, CA. Connecting local homeowners, urban gardeners, and commercial growers with California's land-grant university extension resources, state soil testing lab services, and Master Gardener volunteer clinics.
1. Extension Office Contact Details & Operational Hours
The UC Cooperative Extension - Los Angeles County serves as the primary educational extension center in Los Angeles County. Visit or call during standard operational hours for agricultural advice, soil sample kits, and youth 4-H programs.
| Official Office Name: | UC Cooperative Extension - Los Angeles County |
| Physical Address: | 700 S. Flower Street, Suite 600, Los Angeles, CA 90017 |
| Direct Phone Desk: | (626) 586-1971 |
| Email Contact: | celosangeles@ucanr.edu |
| Office Hours: | Monday – Friday: 8:00 AM – 5:00 PM |
| Official Web Portal: | https://celosangeles.ucanr.edu/ |
2. Official Soil Testing Laboratory & Pricing
Testing your soil is the single most important step before adding fertilizers or agricultural lime. The official testing laboratory serving Los Angeles County is UC Davis Analytical Laboratory & Certified Partner Labs.
| Official Testing Lab: | UC Davis Analytical Laboratory & Certified Partner Labs |
| Lab Location: | One Shields Ave, Hoagland Hall, Davis, CA 95616 |
| Routine Sample Fee: | $20 routine soil fertility kit |
| Expected Turnaround: | 7 to 10 business days |
| Official Lab Website: | https://anlab.ucdavis.edu/ |
How to Collect and Submit a Soil Sample in Los Angeles County:
- Pick up a Soil Kit: Pick up official sample boxes and submittal forms at the UC Cooperative Extension - Los Angeles County (700 S. Flower Street, Suite 600, Los Angeles, CA 90017).
- Collect Sub-Samples: Use a clean stainless steel trowel to take 10 to 12 soil cores from a 4-to-6-inch depth across your garden or lawn area.
- Air-Dry: Mix sub-samples in a clean plastic bucket and air-dry on clean paper at room temperature (never use an oven).
- Submit Sample: Return your filled soil box to the extension office or mail directly to UC Davis Analytical Laboratory & Certified Partner Labs.
3. Master Gardener Volunteer Program & Plant Clinic
The UC Master Gardeners of Los Angeles County provides free plant disease diagnostics, lawn care advice, and eco-friendly pest management tips.
| Program Name: | UC Master Gardeners of Los Angeles County |
| Plant Clinic Hours: | Monday & Wednesday: 9:00 AM – 12:00 PM (Note: Plant clinics run seasonally; call office during winter months) |
| Direct Helpline Phone: | (626) 586-1971 |
| Program Portal: | https://celosangeles.ucanr.edu/UC_Master_Gardener_Program/ |
Volunteer Training: Comprehensive 50-hour UC ANR urban gardening training.
4. Regional Soil & Growing Snapshot for Los Angeles County
USDA Plant Hardiness Zone: Zone 10a / 10b
Natural Soil Profile: Coastal Alluvial Loam & Clay Loam
Popular Local Crops: Citrus, avocados, tomatoes, peppers, subtropical fruit
Extension Specialist Tip: Los Angeles soils benefit from thick organic mulch to conserve soil moisture in Mediterranean climate.
5. 🧮 Interactive Soil Amendment Calculator for Los Angeles County
Estimate the recommended agricultural limestone or elemental sulfur needed to adjust your garden soil pH based on local Coastal Alluvial Loam & Clay Loam characteristics.
📚 Recommended Extension Guides & Soil Articles
Learn more about interpreting your Los Angeles County extension soil test report and managing plant nutrients:
Frequently Asked Questions (Los Angeles County Directory)
The UC Cooperative Extension - Los Angeles County is located at 700 S. Flower Street, Suite 600, Los Angeles, CA 90017. You can call their main desk directly at (626) 586-1971 during standard business hours (Monday – Friday: 8:00 AM – 5:00 PM).
Standard soil analysis for Los Angeles County garden samples through UC Davis Analytical Laboratory & Certified Partner Labs costs $20 routine soil fertility kit. Check with the office for special sample types.
You can reach the UC Master Gardeners of Los Angeles County hotline by calling (626) 586-1971 during plant clinic hours (Monday & Wednesday: 9:00 AM – 12:00 PM).
Los Angeles County falls primarily within USDA Plant Hardiness Zone 10a / 10b. Local soil is characterized as Coastal Alluvial Loam & Clay Loam.
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.