Open Book (climb)

{{Short description|Rock climbing route, California}}

{{Infobox climbing route

| name = Open Book

| photo = Open Book Tahquitz.JPG

| photo_caption = The first two pitches follow the obvious inside corner

| other_name =

| location = Tahquitz Peak, California, United States

| coords = {{coord|33.7605|N|116.685|W|type:mountain_region:US}}

| climbing_area = Tahquitz Rock

| route_type = Traditional climbing

| vertical_gain = 300 feet

| pitches = 3

| rating =

| grade = {{climbing grade|5.9}}

| route_setter =

| first_ascent = John Mendenhall & Harry Sutherland, 1947.

| ffa = Royal Robbins & Don Wilson, 1952.

| fastest_ascent =

}}

Open Book is a traditional climbing route at Tahquitz Rock, in Riverside County, California.{{cite book |title=Rock Climber's Guide to Tahquitz and Suicide |edition=2nd |year=1993 |author=Randy Vogel |publisher=Falcon |isbn=0-934641-31-5}} Since the Yosemite Decimal System was developed at Tahquitz it is no coincidence that the first climb to be rated 5.9, Open Book, is also located at Tahquitz. In 1952, when Royal Robbins climbed it free, it was one of the most difficult free ascents in the country.{{Citation needed|date=November 2022}}