@ Greycliff Mill Between Billings and Bozeman, Greycliff Creek Ranch opens its gates for three special pumpkin patch days. Families can wander the patch, hop on hayrides, enjoy the corn maze, petting zoo, and photo booth, then refuel with coffee and snacks at the historic mill. Visitors can also tour the greenhouse, gristmill, and cheese cave for a true fall-on-the-farm experience.