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. Grape Mountain sits east of the Irish Creek boat ramp on Arrowrock Reservoir. It is the highest point on the West End of the land that separates the Middle and South Forks of the Boise River. A road (gated and closed) leads to the summit. The peak was burned over at some point in the past. The forest is recovering nicely on the North Slopes. The peak is approachable from the east via 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 Boise River to the gate closing on the road that leads to the summit.

Follow the twisting, rough Middle Fork Boise River Road from ID-21 past Lucky Peak and Arrowrock Reservoir. Turn onto Slide Gulch Road about 8 miles past Cottonwood Road. You will cross a pass in 3.5 miles. Descend 1.7 miles from the pass and turn west/right onto an [unsigned] dirt road and follow this road for 1.0 miles until you reach the gate closing on the road that leads to the summit.

I recommend climbing the peak via the road. The peak’s slopes are mostly open for cross-country travel but the road offers an easy, albeit long, walk to the summit. My GPS watch recorded a 9.3-mile round-trip journey. A notation in the summit register reported that another GPS calculated the route at 5.5 miles one way. I doubt that either figure is 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.

Grape Mountain viewed from the road and east.

Grape Mountain as viewed from the road and east of the peak.

The road to the summit makes a good trail.

The road to the summit is a good hiking trail.

The summit from the east.

The summit of Grape Mountain as viewed from the east.

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

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

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

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 as viewed from Hutton Peak. The snow-covered peak behind it is Cottonwood Butte.

Additional Resources

Mountain Range: Boise Mountains

Year Climbed: 2015

Longitude: -115.77139   Latitude: 43.60829

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