I live in Albuquerque, NM. My stepfather has a normally beautiful lawn, very green and lovely. But, sometimes his dogs pee in the yard, and the spots turn yellow, just like in your picture. Do you have dogs or cats with access to your yard? If he sees the dogs pee, he will run over there with a water hose and flush the area really good.

The reason the dogs are not usually on the lawn is because he has kennels in the backyard. He doesn't allow them in the yard, just in the kennel or the house. Sometimes they get loose, and go eat some grass real quick, or pee, lol.

I am in MO as well. Pull up one of the dead areas and take another photo. It almost looks like Bermuda. When you pull on it, you would get a long stalk (risome I believe is the term), with blades of grass growing off of it. It would be dormant now, so probably all brown vs any green

looks like crabgrass to me. Some years the stuff goes mad and covers the bare spots in the lawn. It is shallow rooted so you probably pull a lot of it up, especially last year's stuff which is now the dead, tan stuff you are seeing. Look into a pre-emergent product aimed at crabgrass control to prevent it appearing again this year.

doesn't look like crabgrass to me. I'm with kenstl. I also think it is dormant grass. Let the grass grow tall and mow. I don't think there is a need for a pre-emergent. The grass looks pretty dense for this time of the year

So on my lawn there is a little bit of everything. I've put what I understand to be dead crabgrass on the left of the photo: note the shallow roots and branching of the above ground parts, also there are some curved shapes. On the right is the dead Bermuda. The horizontal piece is the rhizome and there are three root sets, each of them much deeper than the crabgrass roots.

One thing noticed at the turf center the other day: Bayer sells the same product to control both grasses, so they can't be all that fair apart biologically.