Old Mount Baldy to Three T’s Loop is a 20.3 mile moderately trafficked loop trail located near Mount 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.

Length20.3 miElevation gain8,041 ftRoute typeLoop
BackpackingCampingHikingDog friendlyRiverViewsWildflowers
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Day/overnight permits are now required for Cucamonga, San Gorgonio and San Jacinto wildernesses. For more information, see the park page here: https://www.fs.usda.gov/alerts/sbnf/alerts-notices 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.

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Reviews (22)
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Activities (18)
Completed (167)
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Mark English
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HikingGreat!

4/11/21 Hiked in it's entirety, plus West Baldy and Harwood. Added a short out and back to Cucamonga/Bighorn saddle to get miles, as well as Chapman/Cedar Glen. 26.4 miles. A PR and marathon!

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James LeGros
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Hiking

It’s a butt burner we only made it to ridge crests 9,000’

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Efrain Estrada Jr
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Alli D.
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HikingGreat!

Thank you All Trails for the good info beforehand! I only wish I had better shoes, actually filled my 3L Camelbak and brought sunscreen to reapply. I started at 7am. The parking lot was already overflowing up the hill. Made it up and down Mt. Baldy by 11:45am. This was definitely the hardest part. Then I went straight up Thunder Mountain to begin the 3 T’s, summited all three, and made it back to the parking lot by 3:16pm (8hrs 16min). Faster than I anticipated, but much of it was run-able singletrack. TIP: Follow the little pink ribbons on the 3 T’s and know that you have to go off the main trail about 1/4mi to each summit. Telegraph Mountain is not labeled, but there’s a noticeable fork in the trail. The stream and waterfalls on the way to the Ice House parking lot were more beautiful than Vivian Creek, in my opinion.

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Kayla Brown
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HikingOver grownRocky

May 30, 2020. Parked across from the Baldy Trout Ponds and hiked up the Bear Canyon Trail to Mount Baldy, then took Devils Backbone Trail over to the Three T’s Trail. Summit all three T’s and came down Ice House Canyon. Hiked back down the road to my car. Very windy, over 50 mph winds on the exposed parts of the trails, even though the mountain weather forecast was only 20 mph. 21.8 miles and 8,035 feet of elevation gain. 10 hours and 51 minutes on the trail. A little snow by West Baldy, but that was it.

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Dylan Dyer
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HikingBugs
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Matthew Vigil
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HikingIcy

Awesome but very tough trail! I did this hike in preparation for Cactus to the Clouds. I started at 6am and peaked Baldy at 9am! I got to the Ski Resort at 10am. Then I peaked Thunder Mountain by 10:30am. I headed towards Telegraph Peak but had to stop after 1.5 miles because of ice patches. Most people could probably get through the ice but being hard ice and not soft, I could not get enough traction to safely make it across. I’d imagine the ice will be gone within a week or so. I retraced my steps and came down on the steep path under the ski lift. I had to walk about 5 miles down the paved road to get to my car at the Ranger Station. Total distance was 24.3 miles. Looking for a hiking buddy if your interested!

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James Bardin
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Hiking

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!

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Keith Schwebel
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Hiking

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!

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Keith Schwebel
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Hiking
First to Review

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!

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Mimi Sunantinee
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Theron Hayes
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Michael Colston
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Chelsea Ngo
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Magdalena Kosik
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Efrain Estrada Jr
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Solmaz Atashbarghi
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Jake Connell
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Matt Springer
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Barb De Witt
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Nathaniel Lane
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Keith Schwebel
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