Hawaii Extension & Soil Testing Directory
Find your local Hawaii County Cooperative Extension office, official state university soil analysis lab, and Master Gardener volunteer plant clinics.
🔬 State Soil Testing Laboratory
Official Lab: UH Agricultural Diagnostic Service Center (ADSC)
Standard Fee: $12 per routine soil test
Turnaround Time: 10 to 14 business days
State residents can obtain soil sample bags and submittal forms at any local county extension branch.
🌱 State Growing Conditions
Soil Types: Tropical Volcanic Oxisols & Ultisols
Hardiness Zones: Zone 11a / 12a
Popular Crops: Papayas, bananas, taro, citrus, plumeria, sweet potatoes
Tropical volcanic soils bind phosphorus tightly; use rock phosphate and organic compost.
Featured County Directories in Hawaii (1 Listing)
Honolulu County
Extension Office: UH CTAHR Extension - Oahu County
Soil Lab Fee: $12 per routine soil test
Phone: (808) 956-6007
Looking for Another County in Hawaii?
Every county in Hawaii 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 UH Agricultural Diagnostic Service Center (ADSC) or contact our editorial desk for direct local office hours.
Request Local Extension Info for Your CountyFrequently Asked Questions: Hawaii Soil & Extension
How do I get my soil tested in Hawaii?
To test your soil in Hawaii, 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 UH Agricultural Diagnostic Service Center (ADSC) or your local county extension office.
How much does soil testing cost in Hawaii?
Routine soil fertility analysis in Hawaii typically costs $12 per routine soil test. Turnaround time for results is usually 10 to 14 business days.
Does every county in Hawaii have a Cooperative Extension Office?
Yes. Every county in Hawaii 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 Hawaii.
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.