How to vote in Rossmoor in the primary election Rossmoor residents can vote by mail or in-person for the presidential primary election on Tuesday, March 5. In-person polling will be at the Event Center from 7 a.m. to 8 p.m. All registered voters also have received a ballot in the mail. They can then mail in their ballot, drop it off in a secure dropoff location or vote in-person or drop