Early Sept will have campers out in full force, especially Labor day weekend. Atvs everywhere just riding around. Elk will still be active but bugles will be very far and few between.
Some years they are going crazy late Sept.
We've had good luck early and late , weather plays a big role some years.
Looking to be a dry winter so wallows may be key during the heat.
Later Sept could bring a huge snow storm and feet of snow, access will be limited then.

We hunt it every year for archery.

Would send you a pm but you don't take them.