I saw a couple large trees blow down in a windstorm once in the BWCA. Since then, I tend to look for somewhat smaller trees to hang from. I suppose any tree can blow down, but those big trees with shallow root systems seem more likely to go. Does anyone else consider this when picking trees? I know, often there aren't a lot of great hanging spots, but it's something I consider.

I always do a visual and bump the tree with my weight to test. May not tell me much, but might make me sleep better.

Any tree bigger than about six inches is good for me. I just look for widow makers above and I'm good to go.

I tend to avoid the really large trees simply because it is more difficult to get a strap around them.

Thanks for alerting us to the root system issue. Now I've got one more thing to worry about in the wilderness.

It is a good thing to remember. If you are hanging from black spruce you really want to look at the roots as well as the widow makers above.

I've used trees as little as 3-4" in diameter. It was the only thing available at the time.
If you ever have to use trees this small, set your hammock up a little tighter than normal and allow for a little 'bend factor".

mostly and more importantly, it's not so much about the size of tree, but the health and overhead situation of possible cracks, dead zones and branches.