This popular Boise hike also makes for an excellent run, especially when the lower elevations get too hot. The trail signed as “Freddy’s Stack Rock” makes a stem and loop from Bogus Basin Road, traversing the mountainside then circling the ridgetop with the famous rock formation. The first couple of miles are high-quality singletrack, on a scenic ride through mountainside meadows and pockets of forest, with rocky sections here and there. The trail changes character after meeting a multi-way junction. There it dives into conifer forest, on an old road that’s wider and flatter. A bit farther on, another junction makes the start of the loop. Go left if you want to get the climbing out of the way, and get to Stack Rock sooner.