This Adirondack 46 High Peak is number 26 on the list.
Primary Trailhead: Leave Lake Placid on Rte 73, follow Rte 73 toward Keene. Drive through Keene and Keene Valley and proceed back to I87. Head south on I-87 and get off exit 29 and follow the Blue Ridge Road (CR 84) toward Newcomb. Continue for roughly 18-miles to the Tahawus Road (CR25) on the right. Follow this road for 6.3 miles and then left at a junction for another 3 miles to a trailhead on the right.
This is an approximate 9-mile hike, one way to the summit of Allen. From the trailhead you will descend a bit to a crossing of the Hudson River. At this point the bridge has not been rebuilt and you will have to wade through the river. In spring this might not be safely possible. After a short walk through an attractive forest you will come to Lake Jimmy and the not-so-good floating bridge. Take your time crossing here as it is also in disrepair and slippery. Much of the hike will bring you along a state trail that follows not only foot trails but old woods roads and even a gravel road or two. There is another tough water crossing and that is the Opalescent River. There is not bridge here either and it may need to be waded with caution. At 5 miles go right on a plain but unmarked trail, often referred to as a "herd path". The herd path is very apparent and is the most attractive portion of the route. As you approach the top and start following Allen Brook the terrain gets much steeper. Along Allen Brook there is a slide that can be climbed, but care is needed as it is very slippery – a rough herd path on the side will avoid the exposed rock. The summit is treed but off to the side there is an opening or two to take in excellent views of the area.
18 miles RT, challenging, Elevation: 4340’ Ascent: 2540'
Family with Young Kids: Not recommended
Experienced Hiker: 5 to 6 hours to summit
Out of Shape Hiker: Not recommended