Very low! Owls don’t seem to go for altitude beyond the tree tops very much. They’re more gliders than flyers in most cases I believe.

Some owls actually try to fly as low as possible.

You can’t really orbit much lower than that before it starts to be tunneling!

You’re on Feddit I see, so I just abbreviate Long Eared Owl as LEO. You’ll also see Great Horned Owl as GHO. Short Eared Owl I just call Shortie.