Class sizes in WA are high. There was about 25 kids in my DDs K class and 29 kids in 1st grade class. In public gifted program which starts at 2nd grade, class size is around 20.

I feel K and 1st grade class sizes are the most critical ones due to kid's young ages and requiring much more attention. I volunteered in DD's class once a week when she was in K and 1st grade. The class was a chaos and no way an ideal learning environment. Especially wide range of skills was a big problem - kids who doesn't know ABC and kids reading chapter books in the same K class doesn't mix well.