Arizona · university & extension labs
Where to get a soil test in Arizona
A soil test is how you stop guessing at fertilizer and fix the one thing your lawn actually needs. In Arizona, the public program below tests homeowner samples and interprets the results for local soils.
Arizona state lab
University of Arizona Cooperative Extension soil testing
Arizona Extension guidance and lab recommendations.
Visit the lab & sampling instructionsCounty offices
County extension offices.
County extension offices across Arizona stock sample forms and can help you read your results. Whether an office will forward your sample to the state lab varies from county to county, so call yours before you drive over; otherwise mail it in with the form. 26 of the most populous counties are listed below.
Not your county? Find your local office in the full Arizona directory.
- University of Arizona Cooperative Extension, Apache County officeSaint Johns, AZ
- University of Arizona Cooperative Extension, Cochise County office (Douglas satellite)Douglas, AZ
- University of Arizona Cooperative Extension, Cochise County office (Sierra Vista satellite)Sierra Vista, AZ
- University of Arizona Cooperative Extension, Cochise County office (Willcox)Willcox, AZ
- University of Arizona Cooperative Extension, Coconino County officeFlagstaff, AZ
- University of Arizona Cooperative Extension, Gila County office (Globe)Globe, AZ
- University of Arizona Cooperative Extension, Gila County office (Payson)Payson, AZ
- University of Arizona Cooperative Extension, Graham County officeSolomon, AZ
- University of Arizona Cooperative Extension, Greenlee County officeDuncan, AZ
- University of Arizona Cooperative Extension, Hopi Tribe officeKykotsmovi Village, AZ
- University of Arizona Cooperative Extension, Hualapai Nation officePeach Springs, AZ
- University of Arizona Cooperative Extension, La Paz County / Colorado River Indian Tribes officeParker, AZ
- University of Arizona Cooperative Extension, Maricopa County officePhoenix, AZ
- University of Arizona Cooperative Extension, Mohave County officeKingman, AZ
- University of Arizona Cooperative Extension, Navajo County office (Holbrook)Holbrook, AZ
- University of Arizona Cooperative Extension, Navajo County office (Lakeside)Lakeside, AZ
- University of Arizona Cooperative Extension, Navajo Nation office (Tuba City)Tuba City, AZ
- University of Arizona Cooperative Extension, Navajo Nation office (Window Rock)Window Rock, AZ
- University of Arizona Cooperative Extension, Pima County office (Green Valley)Green Valley, AZ
- University of Arizona Cooperative Extension, Pima County office (Tucson)Tucson, AZ
- University of Arizona Cooperative Extension, Pinal County officeCasa Grande, AZ
- University of Arizona Cooperative Extension, San Carlos Apache Tribe officeSan Carlos, AZ
- University of Arizona Cooperative Extension, Santa Cruz County officeNogales, AZ
- University of Arizona Cooperative Extension, Yavapai County office (Prescott)Prescott, AZ
- University of Arizona Cooperative Extension, Yavapai County office (Verde Valley)Camp Verde, AZ
- University of Arizona Cooperative Extension, Yuma County officeYuma, AZ
The steps
How it works.
Get a form and sample the way your lab says to
Pick up a form at a county office or download it from University of Arizona Cooperative Extension soil testing. Where you pull cores and how you mix them decides whether the report means anything, so follow the lab's instructions exactly.
Send it in
Mail your sample to the lab with its completed form, or call your county office first to ask whether it will forward samples.
Turn the report into a plan
When results come back, the numbers only matter if they change what you put down. Enter them in the app and it builds the plan.
The app · soil report analyzer
Got your Arizona report back? Analyze it.
Enter your report values in the Lawn Dominator app and pick your lab, and it handles the messy part: units and extraction methods differ by lab, so your numbers get compared against turf targets that match how your lab measured them. Then it helps build the fertilizer plan for your grass type and checks timing against your live soil temperature.
Free to download on iPhone and Android.
Common questions
Before you ask.
- Where can I get a soil test in Arizona?
- Arizona's public soil testing is run through University of Arizona Cooperative Extension soil testing. Many county extension offices (listed on this page) stock the sample forms and can help you submit. National mail-in labs like Logan Labs, Ward Laboratories, and Waypoint Analytical are established alternatives.
- How much does a soil test cost in Arizona?
- Fees vary by lab and by which package you choose (basic pH plus phosphorus and potassium, versus expanded panels with organic matter and micronutrients). Check University of Arizona Cooperative Extension soil testing for current pricing before you send a sample; the page linked here is the authority for its own fees.
- How do I turn my Arizona soil test into a fertilizer plan?
- Enter your report values in the Lawn Dominator app and pick your lab so units and extraction method are handled correctly, and it compares your numbers against turf sufficiency targets and helps build the fertilizer plan for your grass type.
Looking for another state? See the national map of soil test labs. University of Arizona Cooperative Extension soil testing is the authority for its own test menu, sampling instructions, fees, and result interpretation.