Mayor Suthers is running for a second term against three candidates with far-less name recognition and political experience.
Griswold, a Democrat, has said she will focus on expanding voting rights and access.
Colorado Public Radio will be following the election all day and into tonight. Follow coverage online, on the radio and on social media.
Postmark dates don't count. Ballots must be in the hands of an election official by 7 p.m. Election Day, November 6.
Colorado's good reputation for election security can be traced to Boulder.
Where do the candidates stand on the issues? We've lined up a comparison to assist in your decision.
Candidates for state treasurer and secretary of state as well as Colorado’s expansive 3rd Congressional District also debated Saturday in Grand Junction.
The event gave elections officials a chance to brush up on a series of what-ifs before the 2018 midterms.
State Attorney General Cynthia Coffman failed to make the Republican ballot, garnering just 5 percent of the delegates' votes.