This is an aesthetic snow climb on the northeast face of Hagerman Peak, offering 800 feet of steep snow, up to 55 degrees. The route is in condition* starting mid-late June (we found good conditions 07/06/14).
Hagerman Peak northeast face
As for Snowmass Mountain via Snowmass Lake. The length of the X Couloir is visible from the lake. Access the upper basin as for Snowmass Mountain, then hike southwest towards a huge wedge-shaped buttress directly beneath the saddle on the east ridge of Hagerman Peak.
This couloir, in conjunction with the "Hagar's Way" couloir as described by Roach, forms an "X" on the north face of Hagerman Peak. Both arms of the X have snow, and there are therefore two options to climb the lower section of the route:
1. Hagar's Way - Enter the couloir looker's right of the buttress and climb straight up (south) 40-50 degree snow, then turn right (west) at the center of the X. This is the bottom portion of "Hagar's Way."
2. The X Couloir - Enter the couloir looker's left of the buttress and climb right (west), then traverse west across "Hagar's Way" at the center of the X. This option appears shallower than the other and may be out of condition earlier (you can check the conditions from Snowmass Lake with binoculars or camera zoom).
Continue up the obvious westerly line towards Hagerman Peak on 40-45 degree snow. Climb this section to the top, then exit onto a convenient platform and traverse the easy but exposed ledge to the summit snowfield. Climb the steep snowfield on 55+ degree snow to the ridge and hike west to the summit.
red = X Couloir
yellow = Hagar's Way (per Roach)
Mountaineering axe, sturdy boots, crampons. A second tool is probably useful.
The easiest descent is probably to downclimb the route. If traversing to Snowmass Peak, one could descend via "Hagar's Way." If traversing to Snowmass Mountain, there are few options to bail until reaching the Hagerman-Snowmass Mountain saddle.
* hard packed snow when climbed around sunrise.