Iowa Extension & Soil Testing Directory
Find your local Iowa County Cooperative Extension office, official state university soil analysis lab, and Master Gardener volunteer plant clinics.
🔬 State Soil Testing Laboratory
Official Lab: ISU Soil and Plant Analysis Laboratory Partners
Standard Fee: $15 routine soil analysis
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: Deep Prairie Mollisols (Tama Silt Loam)
Hardiness Zones: Zone 5b
Popular Crops: Corn, soybeans, sweet corn, apples, brassicas
Iowa soils are rich in organic matter; regular testing ensures proper balance of potassium.
Featured County Directories in Iowa (1 Listing)
Polk County
Extension Office: ISU Extension and Outreach - Polk County
Soil Lab Fee: $15 routine soil analysis
Phone: (515) 957-5760
Looking for Another County in Iowa?
Every county in Iowa 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 ISU Soil and Plant Analysis Laboratory Partners or contact our editorial desk for direct local office hours.
Request Local Extension Info for Your CountyFrequently Asked Questions: Iowa Soil & Extension
How do I get my soil tested in Iowa?
To test your soil in Iowa, 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 ISU Soil and Plant Analysis Laboratory Partners or your local county extension office.
How much does soil testing cost in Iowa?
Routine soil fertility analysis in Iowa typically costs $15 routine soil analysis. Turnaround time for results is usually 5 to 7 business days.
Does every county in Iowa have a Cooperative Extension Office?
Yes. Every county in Iowa 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 Iowa.
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.