 All of our drop boxes, of course, will be open through Election Day until 7 p.m. We recommend not to mail your ballot back any later than seven days before the election. So I'd say July 23rd, but preferably earlier than that if you choose the mail. Because you have to remember, it's leaving the Avapai County, hopping on a truck to Phoenix, getting processed, and then brought back up to a local police office.