Colorado has five ballot-qualified parties, and their presidential nominees go on the November ballot automatically. Also, Colorado lets the presidential nominees of unqualified parties, and also independent presidential candidates, get on the ballot by paying $500 and submitting a list of presidential elector candidates. So far, the only presidential candidate who has filed under that procedure is Gene Amondson of the Prohibition Party. The deadline is June 17. Amondson is also already on the ballot in Florida.
Colorado has the 4th earliest deadline in the nation for independent presidential candidates to get on the ballot. The only states that are earlier are Texas, Arizona and North Carolina. No one qualified by petition in Texas this year for president, and only Ralph Nader submitted an independent petition in Arizona. No independent presidential candidate is expected to qualify in North Carolina.