Colorado state elections in 2020 were held on Tuesday, November 3, 2020. The deadline to register and receive a ballot by mail in Colorado was October 26, 2020. Voters may register in person and vote or pick up a ballot at Voter Service Centers October 19 through 7 p.m. November 3, 2020. Colorado exclusively used a vote-by-mail system, although voters may choose to vote in person at Voter Service and Polling Centers (VSPCs).