Tuesday February 16, 2021First Day when Candidate Nominating Petitions can be circulated 
Tuesday March 9, 2021Deadline for Candidates to file nominating petitions
Monday March 29, 202150 days prior to Election Day – Counties must begin processing vote by mail requests; this means voters may begin receiving and casting their mail in ballots
Monday
May 3, 2021
OFFICIAL DEADLINE – VOTER REGISTRATION
*Recommended EARLY deadline to apply for mail-in Ballot
Tuesday May 11, 2021OFFICIAL DEADLINE to apply for mail in ballot
*Recommended EARLY deadline to put mail-in ballots into US Mail. After this date, use hand delivery to return mail-in ballots.
Tuesday
May 18, 2021
PRIMARY ELECTION DAY – Polls 7am to 8pm; all ballots must be cast by 8pm

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More information:
https://www.votespa.com/About-Elections/Pages/Upcoming-Elections.aspx