The Short Answer: No, With a Key Exception
For the vast majority of Colorado voters, the answer is a straightforward no. Your ballot must be physically received by your county clerk and recorder by 7:00 p.m. on Election Day to be counted. A postmark from Election Day, or even the day before, is not enough. If your ballot arrives in the mail on the day after the election, it will not be included in the final tally. This 'received by' rule is a cornerstone of Colorado's election model, designed to ensure a secure and timely count. There is, however, one significant exception to this rule for a specific group of voters.
The 'Received By' Rule Explained
Colorado law is unambiguous: 'All envelopes containing mail ballots must be in the hands of the county clerk and recorder or designated election official no later than 7
p.m. on the day of the election'. This applies whether you mail your ballot or return it in person. The state automatically mails a ballot to every active registered voter, and the responsibility falls on the voter to ensure it gets back on time. To facilitate this, every county provides secure, 24/7 video-monitored drop boxes where voters can deposit their ballots up until the 7:00 p.m. deadline. Election officials strongly encourage using these drop boxes or voting in person if it gets close to Election Day, mitigating any concerns about postal service delays.
The Exception: Military and Overseas Voters
The major exception to the 7:00 p.m. deadline is for voters covered under the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA). This group includes active-duty military personnel, their eligible family members, and U.S. citizens residing abroad. Recognizing the logistical challenges these voters face, Colorado law allows their ballots to be counted as long as they are sent by 7:00 p.m. on Election Day and are received by the county clerk by the close of business on the eighth day after the election. For this specific group only, the postmark does count, providing a crucial grace period to account for international mail and transit times. These voters can also return their ballots by fax or email.
Why Doesn't a Postmark Count for Everyone?
The state's strict 'received by' deadline for the general population is intended to increase public confidence and deliver faster, more certain election results. States that allow ballots to arrive for several days after the election often experience a prolonged counting period, which can sometimes lead to uncertainty and erode trust in the outcome. By requiring all ballots to be in by the close of polls, Colorado officials can begin the final counting process immediately. As Governor Jared Polis has stated, this approach reduces the period of uncertainty and inspires greater confidence in the election process. The system is built around giving voters ample time and methods to return their ballot—from early mailing to the widespread availability of drop boxes—placing the emphasis on proactive voter participation rather than post-election grace periods.
How to Guarantee Your Vote Counts
Given the firm deadline, the advice from Colorado's Secretary of State is clear: make a plan and act early. If you choose to vote by mail, it is recommended to send your ballot no later than eight days before Election Day to ensure it arrives on time. As the election nears, the safest bet is to skip the mailbox altogether. Instead, take your sealed and signed ballot to an official drop box in your county. These boxes are secure and ballots are collected regularly by bipartisan teams of election judges. You can also vote in person at a Voter Service and Polling Center. Finally, you can track your ballot's status online through the state's BallotTrax system, which shows you when it has been sent, received, and accepted for counting.
