Soil testing

Our soil testing flyer (PDF) will explain how to take the sample and where to take it for processing. 

We offer three convenient locations in the St Louis Area to bring your samples to have them tested by our lab.

When preparing your samples please keep in mind:

  1. Please DRY your sample before submitting! Leave soil sit out overnight on a tray with newspaper or other paper source. 
    If your sample is too wet when brought into the office, it will go through the drying process before being packaged for shipment.
  2. Pull samples from various areas of your lawn or garden, even if they are tilled. One big sample from just one area of the yard/garden, will not give you accurate results.
  3. Submit at least 1-1/2 to 2 cups of soil. Usually a sandwich bag or quart size storage bag filled, will suffice.
  4. It takes 10-14 business days for results to be returned. If the soil is wet, add a few extra days.
  5. Also, please keep in mind that the lab is extremely busy during the months of February, March, April, May and June.

MU Extension,
St Louis County (Kirkwood)

132 E. Monroe Ave
Kirkwood, MO 63122
314-400-2115.
M-F 8:30-4:30  

Brightside St. Louis
4646 Shenandoah Ave.
St. Louis, MO 63110
314-772-4646
M-F 9:00-4:00
Gateway Greening
2211 Washington Ave.
St. Louis, MO 63103
314-588-9600
M-Th 8:00-3:30

Please note:  Brightside and Gateway Greening only
accept samples for Lawns or Home Gardens. Commercially
grown or Field Crop samples should be taken to the
Extension Center in Kirkwood.

Not in the St Louis Metropolitan area?  Every county has a local extension to take your samples to. To find your local office, click here.

Soil sample instructional video

Watch Nathan Brandt demonstrate the proper way to collect a soil sample.

Did you have your soil tested?

Free web app helps homeowners buy and apply right amounts of fertilizer. Learn more about it here.

Just need the calculator? Click here

How to determine what your lawn needs from your results. Get the "Soil Testing for Lawns" publication here.