Oklahoma Extension & Soil Testing Directory
Find your local Oklahoma County Cooperative Extension office, official state university soil analysis lab, and Master Gardener volunteer plant clinics.
🔬 State Soil Testing Laboratory
Official Lab: OSU Soil, Water and Forage Analytical Laboratory (SWAFL)
Standard Fee: $10 per routine soil sample
Turnaround Time: 5 to 7 business days
State residents can obtain soil sample bags and submittal forms at any local county extension branch.
🌱 State Growing Conditions
Soil Types: Oklahoma Red Clay Loam & Permian Redbeds
Hardiness Zones: Zone 7a / 7b
Popular Crops: Tomatoes, pecans, peppers, bermudagrass, peaches
Oklahoma red clay requires organic compost to improve soil aeration and water penetration.
Featured County Directories in Oklahoma (1 Listing)
Oklahoma County
Extension Office: OSU Extension - Oklahoma County
Soil Lab Fee: $10 per routine soil sample
Phone: (405) 713-1125
Looking for Another County in Oklahoma?
Every county in Oklahoma 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 OSU Soil, Water and Forage Analytical Laboratory (SWAFL) or contact our editorial desk for direct local office hours.
Request Local Extension Info for Your CountyFrequently Asked Questions: Oklahoma Soil & Extension
How do I get my soil tested in Oklahoma?
To test your soil in Oklahoma, 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 OSU Soil, Water and Forage Analytical Laboratory (SWAFL) or your local county extension office.
How much does soil testing cost in Oklahoma?
Routine soil fertility analysis in Oklahoma typically costs $10 per routine soil sample. Turnaround time for results is usually 5 to 7 business days.
Does every county in Oklahoma have a Cooperative Extension Office?
Yes. Every county in Oklahoma 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 Oklahoma.
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.