Hi Marian - there could be a lot of different causes of these symptoms. A common cause is winter damage. This could be from the lawn going into the winter drought stressed, or turf mites. Here is some information on winter damage: https://extension.umn.edu/yard-and-garden-news/what-does-winter-injury-look-your-lawn and https://ag.umass.edu/turf/fact-sheets/whats-wrong-with-my-lawn. You might need to over seed your lawn in order to try and correct this damage. Another thing to do to try and help us determine what the issue is to do a soil test - we can do them here at the Extension Office in Gunnison! I am attaching instructions on how to obtain the sample. https://servitech.com/laboratory-services/soil-testing/soil-sampling-procedures.

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