3 Colo. Code Regs. § 708-1-50.1
It is unlawful for a covered entity to fail or refuse to reasonably accommodate the creed or religious practice of an individual, unless the requested accommodation would result in undue hardship. After an individual requests an accommodation of a creed or religious practice, the covered entity has a duty to engage in a good-faith interactive dialogue to determine an appropriate accommodation.
A refusal to accommodate an individual's creed or religious practice is justified only when a covered entity can demonstrate that an undue hardship would result from each available alternative method of accommodation. A mere assumption that more people with the same creed or religious practices as the person being accommodated may also need accommodation is not evidence of undue hardship.
3 CCR 708-1-50.1