You can completely hang on the JMT, except at Guitar Lake (unless you bring a pair of cams to lock into the granite). You need to go onto the Facebook group for the JMT and ask. Many have done it, including myself.
The treeline in the Sierra Nevada will be around 10,500 feet. I will tell you now that you will regret not hanging when you're on the trail and walking by all the trees that you could have hung from
I also did the JMT in 13 days and was not looking for low spots to hang from. I just tried to aim for a campsite each night that would leave me 1-2 miles away from the next morning's ascent, so that I would have fresh legs to do it. You'll find that all campsites identified on the Nat Geo map book will be able to support a hammock, except Guitar Lake and the sites above it, on the way to Whitney.
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