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If you've followed FS436 to tree line at 11,600 feet., continue following the same road up the first two switchbacks and then depart the road and begin hiking up the fairly broad NE ridge or Trinchera. You could keep following the road, but it leads to a pass directly north of the summit and a steeper ridge climb. The hike up the NE ridge is easy on tundra for much of the way with typical embedded rocks. The last few hundred feet steepen and become more rocky for the summit finish. When you arrive at the summit, if the winds are blowing too hard (not a surprise for this range) you can hide behind some of the large cairns. The summit view offers a panorama of surrounding great valleys, plains and forest, with rolling, mostly gentle mountains that stretch into New Mexico. Watch for wildlife - particularly herds of elk and bighorn sheep which we saw twice.
Once you arrive at the summit of Trinchera, it would make little sense to not go ahead and include Leaning South Peak and Cuatro Peak, about 2.5 miles south along the central ridge, in your plans for the day. The ridge walk is easy. Mt. Maxwell could also be included, but it is unranked.
Bonus Points: Another option to consider is to summit UN12,955, about one mile north of Trinchera. The descent off Trinchera north may involve a little bit of Class 3 work at a notch along with more difficult Class 2+ talus & rubble according to a report on LoJ by "Furthermore."