See the directions in the "Getting There" section which get you to the trailhead.
The trail starts with a few switchbacks and then after about half a mile crosses a neat rockfield with a large rock/cliff at it's head. After a few more switchbacks you come to the top of that large rock and can scramble out onto it for some neat views. On a clear day you can see Marys Peak in the Coast Range from here. Further on up the trail there is another rock outcropping to the right you can crawl out to for views to the east and Battle Axe.
The trail continues to switchback up the south side of the mountain and finally crosses over to the north side of a ridge. If you are hiking in winter, this is where you will run into some possibly deep snow. To the left on top of the ridge are some neat rock pinnacles/formations. The trail then switchbacks some more up the back side of the mountain and crosses another rockfield with some pikas usually amongst the rocks until it finally reaches the old lookout site which is basically just a small flat rock area with some pins left behind.
From the lookout site, look to the northwest and you will see the true summit. It is not the craggy rock straight north, that's a formation called Nasty Rock. The summit of Henline is just to the left of that. Go back about 20 yards from the lookout site on the trail and you'll see where the new trail to the summit has been made. Take the right fork and follow the easy ridgecrest to the northwest until it steepens. The ridge turns north a bit and then again to the northwest to the true summit approximately one mile from the lookout site. The Chemeketans Outdoor Club flagged the trail from the lookout to the true summit in late 2001 to make routefinding easier. The trail is pretty decent for about half a mile then grows fainter with lots of small tree blowdowns to crawl over. The pink flags are helpful.
It's 2.8 miles from trailhead to lookout site with 2200 feet of elevation gain. To the true summit, add another mile and a little over 500 feet.
None needed for summer climbs.
For winter climbs, take snowshoes and maybe trekking poles with snow baskets.
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