State Route 88 (SR 88), also known as the Carson Pass Highway,is a California State Highway that travels in an east–west direction, from Stockton, crossing the Sierra Nevada at Carson Pass, and ending at the border with Nevada, whereupon it becomes Nevada State Route 88, eventually terminating at U.S. Route 395.

   Route 88 is one of only three routes to continue with the same route number after crossing into Nevada, the others being Routes 28 and 266.

Unlike other two-lane California highways through the mountains (Routes 4, 108 and 120), Route 88 stays open through winter, except during the worst snowstorms, making it the third major route through the mountains, after Interstate 80 and U.S. Route 50. In fact, Route 88 over the Carson Pass is designated as Alternate U.S. 50, such that it may be used during floods of the American River Canyon.

   A portion of Route 88 (from Antelope Springs to the border) started as the Amador/Nevada Wagon Route, a toll road completed in 1862, which was a major thoroughfare through the mountains, as California sent timber, food, and particularly gold to the east during the Civil War. Completion of the First Transcontinental Railroad in 1869 greatly decreased traffic on the wagon road.

   This route is part of the California Freeway and Expressway System^[3] and is eligible for the State Scenic Highway System.

The road is kept open all winter but can be subject to restrictions or short-term closure due to snow (including avalanches) or ice; the current road condition is posted online by Caltrans. 

   Carson Pass is the Sierra Crest mountain pass over which State Route 88 crosses. The historic pass was a point on the Carson Trail during the California Gold Rush and was used for American Civil War shipping to California until the completion of the First Transcontinental Railroad. The Pacific Crest Trail traverses the Carson Pass summit, which has California Historical Landmark #315 at CA 88 postmile 6.09 where Kit Carson carved his name into a tree.