Mount Si is a 9.5 miles (22,000-step) route located near North Bend, Washington. This route has an elevation gain of about 3273.4 ft and is rated as hard. Find more routes like this on the Pacer App.
Very fun hike but still difficult. I would recommend 12 and up with prior hiking experience. Wear sturdy boots for the rocky section, and when you make it to the top, take lots of pictures of this beautiful mountain