From Tahoe City take 89 north 5.5 miles to Squaw Valley.
Take the road into Squaw Valley 2.5 miles to the big (free) parking lot across from the fire station. The Shirley Canyon trail starts at the right front corner of the fire station.
From High Camp via the tram: Take the Siberia Ridge Road 1 mile staying to the right up to Emigrant Pass.
This is the easier approach eliminating 7 miles and 2,000' from the hike.
For tram schedules and prices click here.