Soil testing

Our soil testing flyer (PDF) will explain how to take the sample and where to take it for processing. Cost in St.Louis County and City is $25.00 per sample.

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, and this could add additional days to your results being returned.

Main intake center

MU Extension, St Louis County (Kirkwood)

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

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

Please note:  Brightside and Gateway Greening are
not affiliated with the Extension office and only accept
samples for Lawns or Home Gardens.

Commercially grown crops, athletic fields or Field Crops 
(this includes food plots) samples should be taken to an
Extension Center. Local centers include:

  • St. Louis County - Kirkwood,
  • St. Charles County - St. Peters
  • Jefferson County - Hillsboro
  • Franklin County - Union.
  • 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.
  • Please note: each office sets their own price on samples.
    Please check with your local office for pricing. (St. Louis charges $25 per sample)

Soil sample instructional video

Watch former Extension Specialist 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.