Moss that kills grass
Is there a remedy for eliminating green moss that crowds out grass?
Sherburne County Minnesota
Moss usually grows in lawns because they're too wet and/or shady and the lawn grass cannot compete. If the area is shady, you can try to trim some shrubs or trees back to allow more light.
It's hard to answer the question directly without knowing what your yard looks like. I'm going to include a link to a great article on other possible solutions you can explore.