Hi Gavin. Welcome to the forums! Good to have you along.
Regarding Screech Owls, I think we're kind of at the northern limit of the normal range for Screech Owls. We do get them here, but not in numbers, and unlike the other small owls, they would not be moving through Timiskaming during migrations or irruptions from the north, because there aren't any that much further north. You will notice on our checklist that the Screech Owl is a listed species for northern Ontario by the OBRC, which speaks to its low abundance in our area. It would certainly be interesting to give it a try to see what kinds of numbers we might get, but I wouldn't expect much. Who knows though, we might be surprised. I think the best time to try for that species would probably be mid to late summer rather than the fall. Whatever Screech owls we do have around likely vacate Timiskaming much earlier than the other small owls.