For more comprehensive information, purchase the excellent guide, Sweet Spots, by Jerry Painter and Matt TeNgaio. One of the original hard men, Dave Bingham, has written Underground Idaho which also contains the latest information concerning climbing at the Fins and other local crags.
Located at the southern end of the Lost River mountain range, the Fins offer climbing unlike any other in southeast Idaho. On vertical to slightly overhung walls of immaculate limestone, most routes here feature positive edges and secure pockets. The rock is somewhat sharp, but the texture is excellent. Chances are, your tips will wear out before your forearms. The walls at the Fins have seen significant new development as of 2012, so there are many more routes than I have descriptions for. Dave Bingham, Matt TeNgaio, and Jonathan Siegrist have been the major contributors lately. We all owe a huge thanks to these guys and the earlier developers for their hard work and vision. Morning sun, afternoon shade. When it's too hot to climb elsewhere, excellent conditions can be found at the Fins in the afternoon and evening of even the hottest summer days.
South of Howe on Highway 33, turn west at a gravel pit into Eightmile Canyon. Keep right on the dirt road as it enters the canyon. If you've got a four-wheel drive vehicle, drive five miles to basically the top of the mountain and park in the established parking. For low-clearance vehicles, you'll need to park in the lower parking (about 3.5 miles from the highway).