Went out and hiked to the top of Boney Mt yesterday. Agree with folks who point out this is not a moderate trail once you pass the "monument". A few items I would point out for first timers to this hike as follows 1) When you mapquest the address for the trailhead you end up at a road that is for authorized vehicles only. So we backtracked to the end of Wendy and folks there pointed us over to the State Park parking lot off of Lynn Road; 2) Starting at Lynn or Wendy appears to add about 8/10 mile round trip to the hike; 3) the trail marking was a little confusing and resulted in about 2 miles of backtracking. Biggest mistake we made was to turn at a fork that was labeled Old Boney Mt trail - don't do it - keep going to and past the "monument" which is identified on the fork in the road. 4) Once past the monument it's a pretty strenuous climb up several thousand feet on a trail that is in rough shape.
So with all this said it was an awesome hike. We ended up going between 12 and 13 miles in about 5 hours. The view at the top was spectacular although on the Pacific side it was overcast. I would note that my buddy rolled his ankle on the way down the hill so the warnings on other posts are spot on. I would have rated the hike a 5 if not for the trail condition in a few spots. Sorry for the long post - wanted to share lessons learned!
Tough but great workout. 2 hours up from road below Ranger Houses to the peak. 20 min on top for fried chicken and buddy's home brewed IPA (first time in MANY years I had a beer at 8:30 am). Back down in 1:40 with some trail jogging. Started at 6:30. 30-min - 1 hour earlier next time would be better. Parts of the trail really work calves and heart rate. Maybe the Overlook is moderate, but the peak should be labelled hard. Wonder why AllTrails doesn't have the summit hike listed. I would guess it is closer to 10 mi out and back.