On September 18, 2012 I put up a post from Eric Van Ginkel showing a large amount of bermudagrass (Cynadon dactylon) on the Dowling high school ball field in West Des Moines. The picture below is from last fall. The bermudagrass is the lighter colored grass.
I stopped out at the field on June 7 to see how the bermuda had overwintered. Here is a picture of the field from June 7. The bermuda has overwinetered well and is blending in well with the Kentucky bluegrass. I'll try to get a picture again this fall to see if the bermudagrass has increased or decreased over the summer.