Colorado homeschool law
The full law of both home-education and compulsory attendance is on one of the pages of this blog here.
Compulsory attendance law
Colorado Revised Statute 22-33-104 Compulsory school attendance. There are some references in the home-based education statute here, that's why it's included. Also if you are a licensed teacher in Colorado, there is an exemption to compulsory school attendance for your kids in this statute.
The gist for homeschoolers is:
Send written notification to any school district in Colorado each year for ages 6 - 16. (You are not required to "establish the program" until the child is 7 yrs old. This is kind of a funky blip in the law because compulsory school attendance ages changed in 2006, and this is what legislators came up with.)
Written notification only requires: child(ren)'s name, age, place of residence, attendance hours (172 days, averaging 4 hours/day = 688 hours).
Testing or evaluation every other year, starting 3rd grade (3rd, 5th, 7th, 9th, 11th). Tests need to be a nationally standardized achievement test. Or evaluation by a qualified person (teacher licensed in CO, a teacher who is employed by an independent or parochial school, a licensed psychologist, or a person with a graduate degree in education.)