The Mount Si trail climbs steadily through lush, dense forest from the time you leave the parking lot. Around halfway, the trail flattens out briefly as you stroll through huge old trees and you enjoy a short reprieve from the climb. However, the trail quickly resumes its moderate uphill climb and the many switchbacks that lead to the top.
Once you near the top, there are large rocks that you’ll have to traverse in order to reach the lookout. It’s not super clear the “path” you should take, so you’ll have to find your way up or follow others. Shortly after beginning the scramble, pause and look behind you as you’ll have breathtaking views on clear days of Mount Rainier behind you to the south.
Once you reach the viewpoint, you’ll have amazing views to the west spanning from the Snoqualmie Valley below you all the way to the Olympic Mountains. You’ll also have a great up-close view of the “haystack”, which is a rock formation that is the true summit of Mount Si. The haystack is a challenging class 3 scramble that should not be attempted by most hikers.
In the winter this hike is often snowy and micro spikes may be necessary. Always remember to check trail conditions at wta.org before setting out on a hike.