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
Standard Fee: $15 per 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: Deep Prairie Mollisols & Loess Silt Loam
Hardiness Zones: Zone 4b / 5b
Popular Crops: Sweet corn, soybeans, apples, brassicas, turf
Iowa soils are among the fertile in North America; avoid over-fertilizing with nitrogen.
Featured County Directories in Iowa (6 Listings)
Polk County
Extension Office: Iowa State University Extension - Polk County
Soil Lab Fee: $15 per routine garden soil sample
Phone: (191) 555-0199
Linn County
Extension Office: Iowa State University Extension - Linn County
Soil Lab Fee: $15 per routine garden soil sample
Phone: (191) 555-0199
Scott County
Extension Office: Iowa State University Extension - Scott County
Soil Lab Fee: $15 per routine garden soil sample
Phone: (191) 555-0199
Johnson County
Extension Office: Iowa State University Extension - Johnson County
Soil Lab Fee: $15 per routine garden soil sample
Phone: (191) 555-0199
Black Hawk County
Extension Office: Iowa State University Extension - Black Hawk County
Soil Lab Fee: $15 per routine garden soil sample
Phone: (190) 555-0199
Story County
Extension Office: Iowa State University Extension - Story County
Soil Lab Fee: $15 per routine garden soil sample
Phone: (191) 555-0199
📦 Recommended Mail-In Soil Test Kits & Meters
FTC Affiliate Disclosure: We may earn a commissionIf you need immediate results without waiting for university mail-in lab turnaround times, these top-rated professional home soil test kits provide fast pH, N, P, and K diagnostic analysis:
MySoil Soil Test Kit
Professional mail-in kit analyzed by accredited labs. Returns 13 essential nutrient values (N, P, K, pH, Micronutrients) & customized fertilizer recommendations via app.
Luster Leaf Rapitest 1601
Popular color-comparator kit for 10 instant soil tests (pH, Nitrogen, Phosphorus, Potash). Includes tailored plant preference chart.
Sonkir 3-in-1 Soil Tester
Instant probe sensor for soil moisture, pH, and sunlight levels. Requires no batteries. Perfect for potted plants, lawns, and raised beds.
📋 Request Local Extension & Lawn Testing Assistance in Iowa Statewide
Need help interpreting your lab results or finding local agricultural extension agents? Fill out the brief form below:
Frequently 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 or your local county extension office.
How much does soil testing cost in Iowa?
Routine soil fertility analysis in Iowa typically costs $15 per routine garden soil sample. 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.