Quite a few states open up absentee balloting at a 45 day window, and Iowa opens at the 40 day window. From James Hicks, research director at Early Voting Information Center:
“The following states are mailing ballots to absentee voters: Kentucky, North Carolina, Georgia, Pennsylvania, Delaware, District of Columbia, Florida, Idaho, Massachusetts, South Carolina, Texas, Virginia, Michigan, Mississippi, Indiana, Maine, Missouri, South Dakota, West Virginia. Nearly 10 more join the list this week. This is a big week for mailouts.”
To James’s note, I’ll add the fact that FL, GA, and NC allow “in person” absentee balloting. In NC, this mode is particularly popular.