Diamond Peak Hiking Guide

Diamond Peak Trailhead, Parking & Camping

The drive to the trailhead requires a high-clearance vehicle. From the ID-28N / ID-22E junction, head northwest on ID-28N for 15.8 miles. Turn left onto Pass Creek Road. At 1.8 miles in, turn right to cross over Pass Creek and climb up the hill. Follow this well-worn dirt road as it heads north and passes through a gate half a mile in. One mile past that gate, keep left at the fork and continue west up the road for another 2.5 miles, where you will\ pass through another gate onto road 240. From this gate onward, the route can be a bit confusing. Reset your odometer and make the following turns:

• Make a left turn at 0.5 miles onto road 835. The road requires high clearance
  and AWD/4WD from here.
• Keep left at 0.6 miles.
• Make a slight right at 1 mile.
• Turn right at 1.8 miles onto road 796.
• The trailhead is at 2.4 miles.

East Ridge Route Overview

The standard route follows the East Ridge. The first portion is straightforward before transitioning into a long scramble along the ridge. Staying near the crest generally provides the most stable terrain, while side paths can lead into looser rock. The upper mountain becomes more complex, with multiple route options and increasing exposure.

Trailhead to Scramble

The route begins with a sign, “End of RTE.” If you have a vehicle that can continue on the road past the sign, you will save about half a mile in distance and 500 feet in elevation gain. From the sign, head west on the steep 4x4 road for about a half mile until it transitions into a single-track dirt trail. Stay on this trail as it passes through a rocky scar and eventually into the forest. Continue through the intermittent trees for about half a mile until you hit the saddle below the ridge (9,370ft). 

From the saddle, turn right and head through the low pine trees toward the ridge. This rapid climb gains 1,000 feet in half a mile on loose dirt and scree. Trekking poles are strongly recommended. Once at the top of the ridge (10,385ft), you will get an excellent view of Diamond Peak and The Riddler to the southwest. While Diamond Peak is in sight, much of the upper route to the summit is not, as the trail generally sticks to the ridge’s north.

Follow the ragged trail north and then west for half a mile as it wraps its way toward the peak, gaining around 600 feet. There will be moments where brief scrambling is required, but generally, the trail is in good condition along this ridge. At about 11,050 feet, the trail disappears into the rocky ridge, and the scrambling begins. This is an excellent place to either stash or pack up your trekking poles if you brought them. Gloves and a helmet are highly recommended for this section.

Diamond Peak Ridge to Summit

The route up the ridge climbs around 1,100 feet in 0.6 miles on crumbling rock. The climbing is very much Class 3, though if you go off-course, you could find yourself in Class 4 or even Class 5 terrain. In general, hang on top of or to the right of the spine. Avoid going too low to the right, as staying higher on the ridge keeps you out of rockfall danger and away from unnecessary scree chutes. It’s worth noting that there isn’t any point during this lower section to ever be on the left (south), vertically exposed side of the ridge.

After several more moderate climbing sections, you will reach the top of the spine, where it flattens out temporarily (11,730ft). You are close to the summit here. From this flat reprieve, continue west. The trail does hang left in a few instances, so don’t be afraid to follow it. Make sure to get back up onto the spine whenever you can though. 

Once the route turns left (southwest), it becomes much more manageable. The remaining 200 vertical feet give you a chance to finally take in the view as you make your way to the summit. On the summit, you get an excellent view of Bell Peak to the northwest, The Riddler to the south, and a great view of the Lost River Range to the west on clear days.

Frequently Asked Questions

How Hard is Diamond Peak?

Diamond Peak is rated Class 3, though it can feel more difficult depending on route choices. Staying on a solid line keeps the difficulty manageable, but drifting off route can quickly lead into looser or more exposed terrain. It is best suited for hikers comfortable with scrambling and basic route-finding.

What Makes the East Ridge Tricky?

The challenge of Diamond Peak is not a single crux, but the sustained nature of the ridge. It is a far longer and far crumblier climb than Chicken Out Ridge over on Borah Peak. Scrambling begins earlier than expected, and multiple use paths can pull hikers away from the best line. When in doubt, stay slightly right to avoid a large cliff. The ridge itself typically offers the most secure travel, while side routes can increase difficulty.

Best Time to Hike

Diamond Peak is most commonly climbed between July and October. In dry summer conditions, the route is a straightforward scramble. Earlier in the season, lingering snow can increase difficulty and require additional skills and equipment.

Tips, Gear, and Common Mistakes

There is no water on the route, so plan accordingly. An early start helps avoid heat and weather risks. The most common mistake is underestimating route-finding on the upper ridge. Staying near the ridge crest usually provides the safest and most efficient line. Also, the trailhead can be difficult to get to due to the dirt roads. Be sure to bring a high clearance vehicle.

Should You Hike Diamond Peak?

Diamond Peak is one of Idaho’s best scrambling peaks for hikers comfortable with off-trail travel and Class 3 terrain. Those new to scrambling may find the upper ridge more challenging than expected. With experience, it becomes a highly rewarding climb.