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Old Mount Baldy to Three T’s Loop

Cucamonga Wilderness

Old Mount Baldy to Three T’s Loop is a 20.3 mile moderately trafficked loop trail located near Mt Baldy, California that features a river and is only recommended for very experienced adventurers. The trail is primarily used for hiking, camping, and backpacking and is best used from May until November. Dogs are also able to use this trail.

Distance: 20.3 miles Elevation Gain: 8,041 feet Route Type: Loop

dog friendly






wild flowers

This is a very strenuous hike that combines the Old Mount Baldy Trail, the Devil's Backbone, the Three T's Trail, and the Icehouse Canyon Trail into one giant loop totaling 20 miles and 8,000 feet of elevation gain. It is a very challenging, scenic, and rewarding trek that could be used as a training hike for Mount Whitney or the Cactus to Clouds. Starting from the Icehouse Canyon parking lot, travel down Mount Baldy Road for 1.5 miles toward the village of Mount Baldy. Shortly after the visitors center, turn right into the church parking lot and continue onto Bear Canyon Drive. Hike uphill until the road ends at the Bear Canyon/Old Mount Baldy Trailhead. Take the trail uphill for a mile or so until you hit Bear Flats. After the Bear Flats camping area, the trail gets significantly steeper for the next three miles. This is the most difficult part of the entire hike. At about 9,000 feet, the trail becomes less steep, and you will be able to see the top of Mount Baldy. From Baldy, take the Devil's Backbone Trail east toward Baldy Notch. This will be the most crowded leg of the hike as this is the most popular route up to Baldy. At Baldy Notch, you can refill your water at the Top of the Notch restaurant (if it is open), and then continue southeast toward Thunder Mountain, the first of the Three T's. After Thunder Mountain, you soon enter the Cucamonga Wilderness. The climb up to Telegraph Peak is nicely graded with several switchbacks. At the final switchback, there is a sign for the Three T's Trail--be sure to turn left and continue up the spur that takes you to the summit. At almost 9,000 feet in elevation, Telegraph Peak is easily the most scenic of the Three T's. This is a great place to rest and take pictures. Continue south to bag Timber Mountain, and then the rest of the hike is all downhill as you descend the Icehouse Canyon Trail for the final leg of the loop. This hike requires a permit for the Three T's Trail in the Cucamonga Wilderness. You can grab one from the Icehouse Canyon trailhead before you begin the hike. An Adventure Pass is also required for your vehicle.

7 months ago

Did this loop last weekend, spent two full days hiking. The first night we spent just below the peak of West Baldy. First day was pretty tough, had 45 lb packs because we were carrying 24 lbs of water which we went through almost all of. Second day is much easier, we covered more distance, but didn't compare to the climb of the first day. It was pretty cool to be able to look back at the different peaks we were on from Timber Peak. Would definitely recommend this hike!

8 months ago

I did this giant loop in an attempt to simulate the length and elevation gain of the Mount Whitney Trail. It's a beautiful hike. The highlights are definitely the views from the Old Mount Baldy / Bear Canyon Trail up to the summit of Baldy, as well as the views from the summit of Telegraph Peak, which are amazing. There's only 1.5 miles of road hiking, the rest of the 18.5 miles is all on a trail. I highly recommend this hike!

6 months ago

8 months ago

Sat Apr 21 2018