From the USPS –

Start today – give yourself and your election officials ample time to complete the process.

Rules and dates vary by state, so contact your election board to confimr. Find links at usps.com/votinginfo

Request your mail-in ballot (often called absentee ballot) at least 15 days before Election Day.

Once received, follow the instructions. Add postage to the return envelope if needed.

It is recommended you mail your ballot at least seven days before Election Day.