High school tennis in Colorado is governed by the Colorado High School Activities Association (CHSAA).
Here is a link to girl’s tennis played in the Spring:
While brief, the season is intense with 3A, 4A & 5A Regionals played in the first week of May, and finals are played in the second week.
Like girl’s tennis, the boy’s season is intense with 4A & 5A Regionals played in the first week of October, and finals are played in the second week. Below is a link to boy’s high school tennis played in the Fall.
Colorado High School tennis rules differ in many regards. For example, coaching is allowed on changeover and set breaks. Below is a link to the significant rule differences for both girl’s and boy’s high school tennis.
MaxPreps is a business that reports on high school tennis in many states including Colorado. Here is a link:
High School Uniform. The red CTUA shirt is the recommended shirt for officiating high school tennis.