This is Colorado's first open primary election since voters passed a 2016 ballot measure to allow the state's approximately 1.2 million unaffiliated voters to cast ballots in partisan primaries. That's a big victory, especially since active unaffiliated voters outnumber their Republican and Democratic counterparts in Colorado (there's roughly 1 million in each major party, though Democrats slightly edge Republicans).
Participating is pretty simple. First, you need to register or make sure you're already in the system at govotecolorado.com. On June 4, the El Paso County Clerk and Recorder will mail out primary ballots. If you have not received your ballot by June 12, contact the El Paso County Elections Department at 575-8683. Note that if you're late to register, you may not receive a mail ballot. But you can also vote in person (and register the same day) at a Voter Service Center. Locations: tinyurl.com/epprimary.
If you're a registered Republican, you'll get a Republican primary ballot. If you're a Democrat, you'll get a Democratic ballot. If you're affiliated with a minor party, you won't get a ballot. If you're unaffiliated, you'll get both ballots. (And sorry, but it's too late to change your affiliation in time for the primary.)
Now, pay attention because this is super important: Unaffiliated voters have to choose to vote in either the Democratic or the Republican primary. DON'T RETURN BOTH BALLOTS OR YOUR VOTE WON'T BE COUNTED.
Your ballot must be received (not postmarked by) 7 p.m. on June 26. The county elections department will also post drop-off locations for ballots at epcvotes.com.