Douglas County sets June 8 deadline for primary ballot changes

Douglas County voters have one date that now matters twice: June 8. Ballots for the June 30, 2026, Primary Election will begin going out that day, and June 8 is also the last day for voters affiliated with a political party to change or withdraw that affiliation if they want to vote in a different party’s primary.

That deadline determines which ballot many residents will receive. Colorado’s secretary of state says voters affiliated with the Colorado Democratic Party, Colorado Republican Party, Libertarian Party of Colorado or Unity Party of Colorado by June 8 will receive only the ballot for their party. Unaffiliated voters will be mailed both the Democratic and Republican primary ballots, while the Libertarian Party has barred unaffiliated voters from participating in its primary. The June election still has real consequences in Douglas County because it is the contest that nominates candidates for the November General Election.

Douglas County says ballots will be mailed to the address listed on each voter’s registration record. Residents can check their registration, change party affiliation or update a mailing address through GoVoteColorado.gov, which the county points to as the main state system for voter services. That makes the month ahead more than a calendar item: it is the window for making sure the right ballot reaches the right mailbox.

The county is also leaning on its mail-ballot system to keep people from missing the vote entirely. Douglas County Elections says it has 23 secure ballot drop-box locations across the county, all open 24 hours a day, seven days a week from June 8 through 7 p.m. on Election Day, June 30. Each drop box is under 24-hour video surveillance.

If a ballot has not arrived, the county says voters should act quickly. One county notice says anyone who does not receive a ballot by June 17 can request one from Douglas County Elections at 125 Stephanie Place in Castle Rock. A separate election page says voters who still have not received a ballot by June 22 should call Douglas County Elections at 303-660-7444 or visit a voter service and polling center for a replacement ballot through Election Day.

Colorado certified the June 30 primary ballot on May 1, which cleared the way for county clerks to start mailing. For Douglas County voters, the practical message is simple: check registration now, settle any party-affiliation changes by June 8, and watch the mailbox closely as the primary ballot begins its run through the county.