Snowshoe up the Mosquito pass road for approximately 2.5 miles. You will pass the North London Mill at 2.0 miles. At 2.5 miles the road turns left and crosses Mosquito creek. The road then switches back at as it climbs back towards the North London Mill pass. Cross the creek and continue up the road towards North London Mill for another 0.5 miles.
Exit the road just past a creek at 11,800 feet and start climbing west towards Oliver Twist Lake. As you climb towards the lake you will see the 12,835-foot point in front of Oliver twist lake. Go right, north around the 12,835-foot point. With the snow we never saw any lakes but most likely walked over them. After you pass the 12,835-foot point you will reach a steep 300-foot section. Climb this steep section southwest to reach the south east ridge of Mosquito Peak. There are two steep ridges to the summit. Some of us used crampons for this section and some of us climbed up in our snowshoes either one will work.
I use UTM coordinates from the topo maps and here are a few that will give you the general direction.
13402673 4348496 10,900 feet
On Road just past North London Mill
13400697 4350209 11,400 feet
Exit point on road switchback just past creek
13400240 4350130 11,800 feet
General heading north of the 12,835 foot point
13399000 4350220 12,460 feet
Mosquito Peak Summit
13398100 4350540 13,781 feet
13398000 4351260 13,701 feet
For winter: Snowshoes, ski poles, Ice axe. Crampons would also help but they are not required.
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