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Varied ecological and geological climes on this run up to Timber Mountain with spurs to explore.

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8,287' 2,526 m


5,009' 1,527 m


3,296' 1,005 m


3,296' 1,005 m



Avg Grade (8°)


Max Grade (24°)

Dogs Leashed

Features Birding · Fall Colors · Views · Waterfall · Wildflowers · Wildlife

Adventure Pass required to park at trailhead. Lot fills early on weekends. Do not leave valuables in car. Wilderness Permit required for entry into Cucamonga Wilderness. No campfires allowed in Cucamonga Wilderness.


This run has something for everyone. I have seen serious runners embarking on overnight backpacking adventures via this trail, college kids out for a social run, families, elderly, running meetup groups, and every type of dog.

The scenery is so varied from the trailhead to the saddle and summit of Timber Mountain and it changes from season to season. There are remarkable geological formations along the trail about 1.5 miles up from the trailhead.

After about 1.5 miles, the gentle trail becomes uneven, crossing scree and dry riverbed, then steepens through the switchbacks up to the rise to Icehouse Saddle, before the final push to the summit of Timber Mountain.

There is a problem with people cutting switchbacks. Signs have been posted, but I have seen a lot of people still doing it. While it is very busy on weekends, runners have always been very friendly on this trail and I have not had a problem passing groups easily despite the narrow trails.

The parking lot fills up so you may have to tack an extra half mile or so onto your trek if you can't find a parking space!

Need to Know

If you're a birder, bring binoculars! I have seen California quail and Stellar's jays and I'm not a very good birder, so that's just a sample.

Runner Notes

Great trail for trail runners! One slick section about 0.75 miles from the trailhead where water seeps out from the uphill side of the trail toward the river.


If the parking lot at the trailhead is full, park along Mt. Baldy Road (be respectful of private property/driveways along here). There are pit toilets and trash cans in the parking lot for last-minute needs. Sign-in to the trail registry if required.

The Icehouse Canyon Trail #7W07A is wide and flat for the first 0.5 miles or so as it rises gently along the river. The surface is generally even with sections of stone steps. You pass several little cabins along the river (again, respect the private property here). In this section, you'll notice small but very pretty waterfalls intermittently in the river but different sections flow at different times of the year so waterfalls are not consistent.

About 1.5 miles up from the trailhead, you encounter the Cucamonga Wilderness boundary and associated signage. This also marks the transition into a rockier section of the trail as it follows a scree/dry riverbed section of the canyon floor. There are remarkable geological features along this portion. Try to watch the trail, especially on the way up, as it's easy to lose it on parts of the riverbed if you're watching the amazing scenery.

Just over two miles into the run, the trail begins to rise in earnest toward Icehouse Saddle from the canyon floor. The best way to describe this section is a classic lovely mountain trail. It's dusty and narrow with amazing specimen of pine and fir trees and occasionally steep switchbacks.

After about a mile of this, there is signage pointing toward the summit of this trail, Icehouse Saddle. The last section is also rising switchbacks and the ecology changes to manzanita stands and open pockets of forest floor. This will take you up to the Saddle, which then splits into a network of other trails out into the Cucamonga Wilderness. This is a great place to stop and enjoy the cool breezes and lovely scenery before the final ascent of 0.9 miles.

From this junction, turn left and head north along the Three T's Trail #7W06 as it gradually climbs the ridge toward the summit of Timber Mountain. After 0.7 miles, look for the right-hand turn onto the Timber Mtn. Trail #7W06B. This short spur will climb steeply up to the top of Timber Mountain, marking the turnaround point for this run with beautiful views at an elevation of 8,827 feet.

Flora & Fauna

A lovely array of ecological zones, from yucca varietals on the lower elevation slopes to alder and other riparian trees along the stream bed. Higher elevations have fantastic, humongous pine and firs, which are really remarkable.

Massive stands of manzanita shrubs in the last rise to the saddle bloom in early April and numerous other wildflowers continue through the late spring/early summer.


Shared By:

Alison Kelly with improvements by Alan Coles

Trail Ratings

  4.4 from 9 votes


in Mt. Baldy


  4.4 from 9 votes
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in Mt. Baldy


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6 Views Last Month
5,594 Since Apr 19, 2015
Intermediate/Difficult Intermediate/Difficult



Mt. Baldy from Timber Mountain.
Jun 5, 2017 near Rancho…, CA
Looking west over Ice House Canyon before descending from Timber Mountain
Jun 5, 2017 near San Ant…, CA
Trail view of the fog rolling into the canyon on Icehouse
Sep 21, 2017 near San Ant…, CA
Icehouse November 2020
Nov 12, 2020 near Mount B…, CA
November 2020
Nov 12, 2020 near Mount B…, CA
November 2020
Nov 12, 2020 near Mount B…, CA



Current Trail Conditions

All Clear 57 days ago
Add Your Check-In


Nov 12, 2020
Jona L
Was really icey and had about a foot of snow in some places. Was doing the 3 T's but turned back because shoes were soaked and I was at a happy point. 13mi — 5h 00m
Nov 16, 2017
Justin M
Beautiful creek bed, lots of elevation gain. Nice singletrack, rocky at bottom. Views from Timber were ok
Aug 29, 2015
Shawn patterson
Ran the canyon to the saddle then south towards Ontario peak but at the next saddle we went east to Big Horn saddle. 12.1mi — 3h 00m

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