South Climb via South Spur
This is the standard and most commonly documented mountaineering route on Mount Adams. It is a long, non-technical alpine climb that is usually done on snow in season, but it can involve loose volcanic rock and scree lower on the mountain. The route is straightforward in line-finding compared with the other major routes on the peak, but it is physically demanding because of the large elevation gain. In early season it is often climbed with crampons and an ice axe, and later in summer it may become a steep snow-and-scree ascent. Avalanche hazard can be significant when the route is snow-covered, especially on the upper mountain. Navigation and weather exposure are the main objective concerns rather than technical climbing difficulty.
Route Outline
Cold Springs Camp / South Climb trailhead -> South Climb Trail -> timberline and snowfields
Climb the South Spur / South Climb route on snow, scree, and volcanic terrain
Pass the Lunch Counter area and continue up the broad upper mountain
Reach the summit crater rim and summit of Mount Adams
Descend the same route