Summit Post details this trail nicely and includes photographs.
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Adapted from Summitpost.org:
This is the quickest way to the summit and probably the least technical. A competent party should be able to do the climb in 4 hours or less. The difficulties involved are modest brush on the slopes above Lanham Lake, a moderately steep snow or talus slope to the central notch, and an initial Class 3 scramble out of that notch.
This route and the mountain could be climbed year-round since there is year-round access to the trailhead (or at least to the turn-off from the highway). Skiers frequent the open upper Henry Creek slopes if the avalanche danger is minimal. They often use the Lanham Creek side for the approach, descending the Henry side. As a ski tour the summit is not generally the primary objective. The final summit scramble could be interesting in ski boots.
Nearest Town: Leavenworth/Plain
Drive Stevens Pass Highway either 5.8 miles east of Stevens Pass or 13.2 miles west from Coles Corner (14.5 miles west of Leavenworth) to a turn-off on the south about 0.5 miles west of where the powerlines cross the road. There is a sign saying Stevens Nordic Center. A short spur to the right leads to a parking area. The road continues but is gated in summer. It may be open in winter as the nordic center is just beyond the gate.
Leave It Better than You Found It. This should be every user’s goal. Pick up trash left by others, pull noxious weeds along your route, throw branches over unwanted spur trails, etc.
Disclaimer. Treat this information as recommendations, not gospel. Conditions change and those contributing these reports are volunteers–they may make mistakes or not know all the issues affecting a route. You are responsible for yourself, your actions, and your safety. If you won’t accept that responsibility, you are prohibited from using our information.