I talked to Sean at the Pioneer Marina today. Here's what he had to say . . .
They will be open until atleast October 31st - possibly longer.
Until they close for the season you will still be able to use the launch, get a pump-out (either in the water or on the trailer - $10). Thier hours will be Mon-Sat 9am-5pm and Sundays from 9am-3pm - some Sundays they will be closed so call ahead for Sundays.