Illinois Extension & Soil Testing Directory
Find your local Illinois County Cooperative Extension office, official state university soil analysis lab, and Master Gardener volunteer plant clinics.
🔬 State Soil Testing Laboratory
Official Lab: STAT Analysis Accredited Laboratory Partner
Standard Fee: $25 routine garden 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: Rich Prairie Mollisols & Silt Loam
Hardiness Zones: Zone 6a
Popular Crops: Sweet corn, tomatoes, pumpkins, brassicas, turf grass
Illinois prairie soils are fertile; test soil annually to optimize organic matter levels.
Featured County Directories in Illinois (1 Listing)
Cook County
Extension Office: University of Illinois Extension - Cook County
Soil Lab Fee: $25 routine garden soil sample
Phone: (708) 449-4320
Looking for Another County in Illinois?
Every county in Illinois 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 STAT Analysis Accredited Laboratory Partner or contact our editorial desk for direct local office hours.
Request Local Extension Info for Your CountyFrequently Asked Questions: Illinois Soil & Extension
How do I get my soil tested in Illinois?
To test your soil in Illinois, 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 STAT Analysis Accredited Laboratory Partner or your local county extension office.
How much does soil testing cost in Illinois?
Routine soil fertility analysis in Illinois typically costs $25 routine garden soil sample. Turnaround time for results is usually 5 to 7 business days.
Does every county in Illinois have a Cooperative Extension Office?
Yes. Every county in Illinois 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 Illinois.
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.