Most climbing holds can be put on a tree. When choosing climbing grips to place on a tree, ensure they are made of semi-rigid polyurethane such as Red Point Climbing Holds that allows the material to conform slightly to the irregularities of the surface. This adds a layer of protection to your set-up by distributing the load over a larger surface area, avoiding stress concentration that can cause climbing holds to fracture on un-even surfaces. The polyurethane also allows the material to have more contact with the bark so that friction is maximized and the climbing hold will not spin.
Attaching climbing holds to a tree is a great solution if you are unable to build a bouldering or climbing wall. The tree provides a great surface to attach your climbing holds to. When attaching a climbing hold to the tree, a small number of simple modifications may be necessary in order to do so. By enlarging the cut-away around the bolt head using a “Forstner” drill bit, a larger drill driver can be used. After that, it is as simple as purchasing a 3/8” lag bolt and drill directly into the tree. Consider adding a small hole close to the edge of the climbing hold as a “set-screw” hole, and using a small 1/8” screw to prevent any rotation between the climbing grip and the tree.
We suggest the Sliver Jugs as an excellent grip to attach your rock climbing holds to a tree. Check them out here.