Hidden Falls lives up to its name. It iss easily accessible and hides behind a rocky outcropping. Although the trail to Hidden Falls is short, it is worth donning snowshoes as the path may have some deep snow. A mine near the end of the trail provides some exploration options for the more adventurous, and since the trip is so short, visiting Hidden Falls is an easy add-on to any other winter adventures in Big Cottonwood Canyon.
The path to Hidden Falls is not on an established trail, but it does depart from the Mill B North Trailhead. After parking along the road at the Mill B North and South Trailhead (the parking areas are not plowed in winter), cross the hairpin to the trailhead. Instead of taking a right to follow Mill B North Trail up the slope, continue straight following the creek. There will most likely be some existing snowshoe prints from previous adventurers. Follow the creek for about 0.1 miles, past a mine entrance, to what seems like a dead end. Walk out into the creek (you may want to take off your snowshoes for this part) to get a view of Hidden Falls.
The Mill B North and South trails both provide some snowshoe extensions. As with all snowshoeing trails in the Wasatch Mountains, make sure to check avalanche conditions at Utah Avalanche Center before you go.
Winter backcountry adventures can be dangerous outdoor activities that pose significant risks as conditions affecting safety (i.e. weather, snowpack stability, avalanche hazard) are constantly changing. Prior to engaging in these activities each individual should get the proper training to make safe decisions and be equipped to use avalanche safety resources and tools. Please visit our Backcountry Skiing and Avalanche Safety post to learn more.