A Conundrum

I'm considering going entirely off-grid in October, popping back up on 4 November (mom and dad, I'll answer your calls and check in, as long as there's no current events chat). I won't do it if I can't first send in my ballot. Washington is awesome about voting by mail, but I haven't been able to find anything about requesting an early ballot. Washington's election websites indicate that they send out ballots about 18 days ahead of the election. I'm sure it will be easy to find the early option, but I figured I'd throw this out there in case anyone reading this has experience in requesting and returning an early ballot.