C.R.S. § 22-32-140

On or before July 1, 2011, each school district board of education shall annually provide to the parent or legal guardian of each student enrolled in a school of the school district the standardized immunization document developed and updated by the department of public health and environment pursuant to section 25-4-902 (4), C.R.S. For purposes of this section, solely posting a copy of the standardized immunization document on a website or in a central area of the school is not sufficient to satisfy the notice requirements of this section; however, each school district is encouraged to post a copy of the standardized immunization document on its website.