If you are experiencing harassment in a work environment, then you need to consult with an employment law attorney. If you believe you have a geneal tort claim for misconduct, then the statute of limitations in Colorado is two years, you must file within two years of the tortious conduct or lose your right to do so. Other time limitations may apply and to best ascertain the SOL which applies to your situation you should consult an atorney.
The information provided to you in this answer is not, nor is it intended to be, legal advice. You should consult an attorney for advice regarding your individual situation if you have further questions.