Where can I get my garden soil tested in the Broomfield/Louisville/Boulder area?
Adams County Colorado soil and fertility issues
The you can submit a sample to the Colorado State University soil testing lab via mail. You can find information on how to collect and submit a sample here:http://www.soiltestinglab.colostate.edu/documents/soilsample_horticulture.pdf
Colorado Analytical, which is private lab out of (I believe) Brighton, would also be an option. More information here: http://coloradolab.com/
I hope this helps, please let me know if you have further questions.