I'd say it is difficult, especially if you're a transplant. My best successes have been mingling with gym regulars over time and buddy hikes. With hiking, most of the people who have become friends are 20-30+ years older than I am. They know what they want from their hobbies, and they're very dependable with scheduling and being on time!

Other comments mentioning joining a local group or sport, the best way of befriending locals is just being around consistently. It can take a while, but everyone is really nice. The phrase "fast friend" hasn't been a thing for me out here unless I meet other transplants. Good luck!