Black Warm-up Boulders are another great warm up area as the name indicates. Most of the routes are V0 - V1, but there are a couple a little more difficult. They are well positioned to let you warm up before you continue onto the more difficult problems further into the Kraft Boulder area of Calico Basin. You get there by turning into the residential area before the Red Rock park entrance. Kraft Boulders are an abundant and classic bouldering area. There are some boulders with petroglyphs and it's illegal to climb within 50' of them. Human waste bags are also provided. The area is under threat of closure so please be respectful.