Oklahoma County, OK Extension Office & Soil Testing Directory
Welcome to the official directory resource for Oklahoma County, OK. Connecting local homeowners, urban gardeners, and commercial growers with Oklahoma's land-grant university extension resources, state soil testing lab services, and Master Gardener volunteer clinics.
1. Extension Office Contact Details & Operational Hours
The OSU Extension - Oklahoma County serves as the primary educational extension center in Oklahoma County. Visit or call during standard operational hours for agricultural advice, soil sample kits, and youth 4-H programs.
| Official Office Name: | OSU Extension - Oklahoma County |
| Physical Address: | 2500 NE 63rd Street, Oklahoma City, OK 73111 |
| Direct Phone Desk: | (405) 713-1125 |
| Email Contact: | oklahomaco@okstate.edu |
| Office Hours: | Monday – Friday: 8:00 AM – 4:30 PM |
| Official Web Portal: | https://extension.okstate.edu/county/oklahoma/ |
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 Oklahoma County is OSU Soil, Water and Forage Analytical Laboratory (SWAFL).
| Official Testing Lab: | OSU Soil, Water and Forage Analytical Laboratory (SWAFL) |
| Lab Location: | 048 Agricultural Hall, Stillwater, OK 74078 |
| Routine Sample Fee: | $10 per routine soil sample |
| Expected Turnaround: | 5 to 7 business days |
| Official Lab Website: | https://extension.okstate.edu/programs/soil-water-forage-analytical-laboratory/ |
How to Collect and Submit a Soil Sample in Oklahoma County:
- Pick up a Soil Kit: Pick up official sample boxes and submittal forms at the OSU Extension - Oklahoma County (2500 NE 63rd Street, Oklahoma City, OK 73111).
- 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 OSU Soil, Water and Forage Analytical Laboratory (SWAFL).
3. Master Gardener Volunteer Program & Plant Clinic
The Oklahoma County Extension Master Gardeners provides free plant disease diagnostics, lawn care advice, and eco-friendly pest management tips.
| Program Name: | Oklahoma County Extension Master Gardeners |
| Plant Clinic Hours: | Monday – Friday: 9:00 AM – 3:00 PM (Note: Plant clinics run seasonally; call office during winter months) |
| Direct Helpline Phone: | (405) 713-1125 |
| Program Portal: | https://www.oklahomacountymastergardeners.com/ |
Volunteer Training: 50 hours of OSU Extension horticulture instruction.
4. Regional Soil & Growing Snapshot for Oklahoma County
USDA Plant Hardiness Zone: Zone 7a / 7b
Natural Soil Profile: Oklahoma Red Clay Loam & Permian Redbeds
Popular Local Crops: Tomatoes, pecans, peppers, bermudagrass, peaches
Extension Specialist Tip: Oklahoma red clay requires organic compost to improve soil aeration and water penetration.
5. 🧮 Interactive Soil Amendment Calculator for Oklahoma County
Estimate the recommended agricultural limestone or elemental sulfur needed to adjust your garden soil pH based on local Oklahoma Red Clay Loam & Permian Redbeds characteristics.
📚 Recommended Extension Guides & Soil Articles
Learn more about interpreting your Oklahoma County extension soil test report and managing plant nutrients:
Frequently Asked Questions (Oklahoma County Directory)
The OSU Extension - Oklahoma County is located at 2500 NE 63rd Street, Oklahoma City, OK 73111. You can call their main desk directly at (405) 713-1125 during standard business hours (Monday – Friday: 8:00 AM – 4:30 PM).
Standard soil analysis for Oklahoma County garden samples through OSU Soil, Water and Forage Analytical Laboratory (SWAFL) costs $10 per routine soil sample. Check with the office for special sample types.
You can reach the Oklahoma County Extension Master Gardeners hotline by calling (405) 713-1125 during plant clinic hours (Monday – Friday: 9:00 AM – 3:00 PM).
Oklahoma County falls primarily within USDA Plant Hardiness Zone 7a / 7b. Local soil is characterized as Oklahoma Red Clay Loam & Permian Redbeds.
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.