Travel guide to the top of Trinity Mountain

Trinity Mountain is a high mountain peak at an elevation of 2.868m (9,409ft) above the sea level, located in Elmore County, in the U.S. state of Idaho. The road may be blocked by snow until early July. It’s one of the highest mountain roads in Idaho.

Trinity Mountain

Tucked away in the Trinity Mountains, a subrange of the Boise Mountains within the Boise National Forest, the road to the summit is unpaved. It’s called Trinity Mountain Road (129A). The summit is often snow bound well into June and access from snow can keep the road closed into June and longer if going north from the pass.

For your safety, be sure to check the weather forecast before you begin your trip.4x4 vehicle required. The last part of the service road that leads to an active fire lookout on its summit is closed to private vehicles. The view from the top of the highest peak in the Trinity Mountains is exceptional, with panoramic views of several subalpine lakes and other mountains in the Boise Range.

The road to the summit is steep. Starting from Forest Road 129, the ascent is 3.54km (2.2 miles) long. Over this distance the elevation gain is 294 meters. The average gradient is 8.30%. The summit hosts a fire lookout tower. It is still considered active and utilized during fire season. If there is a thunderstorm in the area, please do not visit the lookout.
Pic&video: Idaho Dual Sport