C.R.S. § 24-34-403
24-34-403. Time limits on filing of charges
24-34-403. Time limits on filing of charges. Any charge alleging a violation of this part 4 must be filed with the commission pursuant to section 24-34-306 within three hundred days after the alleged discriminatory or unfair employment practice occurred, and if a charge is not timely filed, it is barred.