For the most part, most of the schools will be pretty good. Check out
Welcome to Laramie County School District No.1 for more info. I hear a lot about what people say are the great schools but I would check class room sizes first. No matter how great your teachers are, if they are over worked, someone gets left behind.
I have 3 girls and a boy, 5 years old and younger. I have have them in Early Headstart and Headstart. My oldest will start kindergarden this fall. The school district also has a progam called Pre-K. They will do home visits, to give you the tools and information that will need to prepare you and your child for school. Good Luck