Within 120 days of expiration

https://www.jeffco.us/FAQ.aspx?TID=24

How do I renew my Jefferson County concealed handgun permit?
It is the applicant's responsibility to submit for renewal of a permit before the expiration date on the permit card. You must submit a renewal only in the county you reside, own property, or own a business. Applicants may submit a completed application, proof of residency (a valid Colorado driver's license, Colorado ID or Military Photo Identification) and $35 within 120 days before the permit expires. The “Proof of Firearms Training” on the back of the application does not pertain to renewal applicants as long as a certificate is already on file and the existing permit card is not more than six months expired. The applicant must deliver the original application in person to the Jefferson County Sheriff’s Office Records Unit. Incomplete applications will not be accepted. Per C.R.S. 18-12-205 (2) (a), all applicants must sign the completed application in the presence of the issuing county sheriff or designee. These permits are valid for an additional five years from the issuance date.