All details in the challenge list notes: letterboxd.com/drwade42/list/the-11th-annual-letterboxd-season-challenge/
"Letterboxd Season Challenge is a yearly challenge running 33 weeks from September to May (with a 2 week winter break). This season will run from September 1st, 2025 through May 3rd, 2026. Each week has a theme, which can be found in the notes of the list, and the goal is to watch and review at least one new-to-you film every week that fits the theme."
I will be aiming for all horror movies through October, as I'm also doing the 100 horror movies in 92 days challenge. After that, I'll be trying to pick ones I own on physical media whenever possible, since I've been collecting a lot of things I've never seen!