Arrive at Little Si trail head and start climbing until about elevation of 780ft where you will see a signpost for "Boulder Garden Loop trail." Continue on the Little Si trail, or take the loop, they meet again about 820 feet on. Continue on the trail. Massive moss-covered boulders litter the landscape as you hike this portion of the trail. At about 1400 feet you arrive at the junction for Old Si trail. The path from here is straightforward, with a couple of junctions with the newer trail.
At the first junction, keep left to continue on Old Si trail. Keep left again at the second junction to stay on the Old Si trail. In a short distance, the new and old trails finally merge. Continue on new trail to the top.