Another good one is Mt. Diablo to Mt. Lassen, which is around 180 miles. That's the longest one I have seen in California. Tom Stienstra claimed it's 180 miles

Another good one is Mt. Diablo to Mt. Lassen, which is around 180 miles. That's the longest one I have seen in California. Tom Stienstra claimed it's 180 miles, which is a long way. [1] Other sources claim somewhat shorter distances. [1] http://www.sfgate.com/outdoors/article/Clear-viewing-from-Mount-Diablo-5988343.php http://www.sfgate.com/outdoors/article/Clear-viewing-from-Mo... (Oops somebody already pointed it out!)