Note: Early Wednesday morning, the AP called the presidential race in Arizona for Joe Biden. ABC News has not called this race, which has led to differing numbers of Electoral College votes for Biden. Denver7 is using ABC News numbers on air.
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Sept. 18: Military and overseas voters can begin early voting.
Oct. 9: Counties will begin mailing ballots to registered voters. Drop boxes open in some counties.
Oct. 16: Last date at which mail ballots can be sent out by county clerks.
Oct. 19: Ballot drop boxes, Voter Services and Polling Centers open statewide.
Oct. 26: Deadline to register to vote or update your voter registration and still receive a mail-in ballot.
Oct. 27: Officials say that you should no longer try mailing your ballot back by the Tuesday before the election and should instead use a drop box or go to a polling center.
Nov. 3: Election Day — ballots must be dropped off by 7 p.m. and voters in line at polling centers before 7 p.m. will be able to cast ballots.
Nov. 12: Last day for county clerks to receive military and overseas ballots and last day to cure a signature for voters who need to do so.