Grape Mountain

Elevation: 5,896 ft
Prominence: 1,516

This peak is not in the book.


This somewhat isolated Boise Mountain summit is a great destination for hikers in the spring. This mountain sits east of the Irish Creek boat ramp on Arrowrock Reservoir. It is the highest point on the western end of the land that separates the Middle and South Forks of the Boise River. A road, gated closed, leads to the summit. The peak was burned over at some point in the past. The forest is recovering nicely on the northern slopes. The peak is approachable from the east via the Slide Canyon Road [(C)(1)] that connects the Middle Fork Boise River Road [(C)(1)] and the Upper Blacks Creek/South Fork Boise River Road [(G)(1) and (1.1)].

This track shows the road route from the Middle Fork to the gate closing the road that leads to the summit.

This track shows the road route from the Middle Fork to the gate closing the road that leads to the summit.

Follow the twisting, rough Middle Fork Road from ID-21 past Lucky Peak and Arrowrock reservoirs. Eight miles past the Cottonwood Road and turn onto the Slide Gulch Road. You will cross a pass in 3.5 miles. Descend 1.7 miles from the pass and turn west (right) on a dirt road (unsigned) and follow this road for 1.0 till you reach the gate closing the road that leads to the summit.

I recommend climbing the peak via the road. The peak’s slopes are mostly open for crosscountry travel but the road offers an easy way, albeit, long walk to the summit. My GPS watch recorded a 9.3 round trip journey. A notation in the summit register reported that another GPS calculated the route was 5.5 miles one way. I doubt either were accurate. If you want to try something different, Zach Vickery climbed the peak from the west after kayaking across Arrowrock Reservoir.

This track shows the route I took to the summit. The topo maps do not show the road leading to the summit but it does.

This track shows the route I took to the summit. The topo maps do not show the road leading to the summit but it does.

Grape Mountain viewed from the road and east.

Grape Mountain viewed from the road and east.

The road to the summit makes a good trail.

The road to the summit makes a good trail.

The summit from the east.

The summit from the east.

There is an electronic facility on the summit and a summit register mostly signed by hunters.

There is an electronic facility on the summit and a summit register mostly signed by hunters.

See John Platt’s trip report for additional access info.

Grape Mountain route. John Platt Map

Grape Mountain route. John Platt Map

The summit of Grape Mountain. John Platt Photo

The summit of Grape Mountain. John Platt Photo

Grape Mountain viewed from Hutton Peak. The snow covered peak behind it is Cottonwood Butte.

Grape Mountain viewed from Hutton Peak. The snow covered peak behind it is Cottonwood Butte.

Climber Trip Reports

Mountain Range: Boise Mountains

Year Climbed: 2015

Longitude: -115.77139   Latitude: 43.60829

Share this post ...Facebooktwittergoogle_plusredditpinterestmail

Comments are closed.