Free and Secluded
This dispersed camping is free, huge bonus in my book. While searching for our perfect spot we did come across a few large parties, making us apprehensive that we would experience our ideal peaceful experience, but we were wrong to be. There were dozens of open sites that we had our pick of. A handful of cars drove by throughout the evening and night, but not an outrageous amount. Pretty dang good for very accessible NF camping spots. There are a good deal of trailheads near by, meaning you're never too far from a pit toilet or a bulletin board with information.
We visited in early September and found the weather to be very pleasant. Our view of Mt. St Helen's was obscured by the tall trees that offered our site seclusion and privacy, but we relished the view of the active volcano while driving to and from our site.