Last day to apply for a mail-in ballot for the 2021 primary Posted on Dec 23, 2020 Calendar Add to Calendar Add to Timely Calendar Add to Google Add to Outlook Add to Apple Calendar Add to other calendar Export to XML When: May 11, 2021 all-day 2021-05-11T00:00:00-04:00 2021-05-12T00:00:00-04:00 Election Dates May 11, 2021 is the last day on which you may apply for a mail-in ballot for the 2021 primary, which is on May 18.