My wife is an EXCELLENT travel planner and always books in-demand places the day they start taking reservations, often a year out these days. She always finds great places (except I found the Bitterroot River Ranch last year).
She booked us at Chateau Lake Louise and Banff Springs Hotel this September. I think both reservations were made last September.
Never been but I’ve always heard terrific things about Banff.
That sounds like a great trip. Enjoy 👍