The Humbug Spires Primitive Area is a non-motorized area popular for rock climbing. Impressive outcroppings of quartz monzonite, part of the Boulder Batholith, rise 300 to 600 feet and provide outstanding climbing opportunities, most of which range from 5.5 to 5.7 in difficulty, although routes to challenge all levels of ability are present.
The main trail extends up Moose Creek into the rock spires. Camping is primitive with no designated campsites. Camping for RVs is available at the Divide Bridge Campground on the Big Hole River five miles away.
To reach the area take Interstate 90 west from Butte to Interstate 15. Follow Interstate 15 south to the Moose Creek Exit, then east on gravel road for 3.5 miles.
