The Butler Fork Trail is just a little spur that starts right off of Highway 190 (Big Cottonwood…read moreCanyon Road) up in Big Cottonwood Canyon. It's most commonly used as the start for a hike of Circle All Peak, Mount Raymond, Gobblers Knob, or as an alternate route to reach Dog Lake (rather than the more common and direct Mill D North Fork trail a bit further up the canyon).
The actual Trailhead, located on the north side of the canyon road, hosts enough parking for 15-20 cars. There's a trailhead post and signboard with information about the hike, and a couple of maps. There aren't any other facilities there to speak of, so don't plan on finding a potty or fill up on water. Come prepared.
The trail is steep. It's not too rocky, and it's not "stair-stepper" steep, but the dirt path will rise and rise in elevation without relenting. In the first half-mile, you follow Butler Creek, and eventually rise above it before leveling out (a momentary reprieve from the climb) and crossing a footbridge. You resume the climb, and after about a half mile, you reach a fork. Go right (north, turning east) to stay on the Butler Fork Trail and eventually junction with the Desolation Trail, find Dog Lake and see the Butler Fork Trail to its terminus, or go left (west) and you'll officially be on the Mill A Basin Trail headed towards Circle All Peak, Mount Raymond, and Gobblers Knob. By going west on the Mill A Basin Trail you'll also junction with the Desolation Trail. You could make a loop out of the experience, by going either direction at that fork 1/2 mile in, taking that trail to its terminus at the Desolation Trail, and then traversing Desolation back to its junction with the trail you decided not to take back at the fork. A quick measurement on my map puts that option at around 7 miles.
A more popular option, however, is to out-and-back, and leave the Butler Fork Trail in favor of the Mill A Basin Trail about at that fork. The most popular hike here is probably the Circle All Peak route. Circle All Peak isn't really a "peak" so much as a bump with a nice view, but let's not quibble over terminology. That view is worth the price of admission. You'll go left (west) at the fork, and then continue straight up the canyon, eventually winding through a series of switchbacks amongst the aspen trees on one side of the canyon wall, until reaching the canyon saddle and continuing on up the other side. Keep your eyes open once you're up on the ridge top, because the trail shoots off to the left for Circle All, and it's easy to miss. If you continue straight, you're headed to Raymond Peak and eventually Gobblers Knob. Take that side trail to the left (south) and you've got 100-150 yards of climbing through the trees before popping out for terrific views. Because of the relentless climb (you gain over 1500ft in elevation) it feels like more than 1.7 miles to this point, but that's what the map says
I've not done the hike in Autumn, but I've heard it's tremendous with the aspens and the other foliage turning colors. In June, it was bright green, overflowing with foliage, especially on the lower portions along the creek. There were several flowers in bloom, with many more on their way. I hiked next to a botanist who pointed out the penstemon, wild sweet pea, scarlet gilia, columbine, lupine, larkspur, and I saw a violet-colored wild clematis (?) which I'd not seen elsewhere.
Since BCC is free and the parking is free, this is a great way to get some recreation without busting the bank. It's a tremendous hike, no matter what direction you end up going. Just be prepared--pack plenty of water and know that this one is quite strenuous, steep, and will let you know if you're out of shape.
Trailhead coordinates: 40.6492, -111.6614