Going East from Lost Pass up the gentle slopes of Lost Peak is the easiest route to the summit. At an elevation of 5550, Lost Pass is just 965 feet beneath the summit of Lost Peak. Lost Pass is more than just a starting off point for an enjoyable climb. It offers spectacular views of the Bailey Range, Lost Basin, Mount Olympus, Thousand Acre Meadow, the Anderson Massif and the peaks at the head of the Dosewallips River Valley. Fat, juicy mountain blueberries coat it's slopes and bears, marmots and eagles are a common sight. Be sure to stop and enjoy the sweeping views on the way up and down from Lost Peak.
Lost Pass is approachable from Dose Meadow, 0.9 miles to the south. The Trail is steep and treacherous, and should be done with plenty of light. Also, Lost Pass can be reached from Cameron Pass, 1.9 miles to the Northeast.
From Lost Pass Continue North East up the brushy slopes until reaching the tree's near the terminus of the ridge. Upon reaching this point you will come onto a rocky crest, with interspersed Sub-Alpine Fir mixed in with the Talus rock. From here walk towards the summit until reaching a Talus basin, with a small north facing snowfield. Descend into the basin and scramble up the opposite side, until you are on the far ridge. From there traverse back to the West until reaching the summit block area. Ascend through and over various boulders to the summit, about 45-50 feet above the ridge. Scrambling skills are necessary at this point. There are two summit blocks, with the more obolisque looking one being the true summit.
Always carry the 10 Essentials. I brought an Ice-axe, but didn't use it. But I'm assuming that from Late October-Early July there is lot's of snow on the slopes, so it should be carried during these months.