Monday, June 8 — Colorado June Primary ballots mailed.
Monday, June 15 — Colorado June Primary counting begins.
Monday, June 22 through Tuesday, June 30 — Colorado June Primary voting centers open.
Tuesday, June 30 — Colorado June primary.
Thursday, July 9 — Last day for unaffiliated candidate to file petition for November election.
Thursday, July 16 — Last day for write-in candidate to file intention for November election.
Friday, Sept. 4 — Colorado Secretary of State certifies ballot for November election.
Friday, Oct. 9 — Colorado ballots mailed for November election.
Friday-Tuesday, Oct. 9-13, 2020. ScienceWriters 2020, the annual conference of the Council for Advancement of Science Writing and National Association of Science Writers. Registration limited to professional and student science writers. Fee. Details to be announced. At University of Colorado Boulder and CU Anschutz Medical Campus, Aurora.
Monday, Oct. 19 through Tuesday, Nov. 3 — Colorado polling centers open for November election.
Sunday, Nov. 1 at 2 a.m. — Daylight Saving Time ends and Standard Time resumes.
Tuesday, Nov. 3 — November general election.
