Ready for a very challenging hike with an amazing payoff? You will love the experience of getting to the summit of San Gorgonio Mountain, also known as Old Greyback. This peak is 11,503 feet tall. The mountain is located about 26 miles from Big Bear Lake, so if you want to see both, it’s a great way to combine seeing two of our region’s stunning natural sites in one weekend. Hike the tallest mountain in Southern California and you’ll be glad you did!

You’ll definitely need some significant hiking experience for this trail, as it’s 19 miles long and will take you over 11 hours to complete. But it is absolutely worth it to see the unbelievable views from the top of the mountain.
AllTrails Kirsten Walkup
On your way to the summit, you’ll get to see some beautiful nature, including forest trees that you won’t see in the cities.
Christopher Salmon/AllTrails
You’ll feel free and able to see for miles. Even for Southern California nature lovers, sights like these are rare, and you’ll want to soak in every detail of the gorgeous landscape.
Russian Frolov/AllTrails

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When the light is low on your way back, you’ll even be able to see city lights from far above the fray.
Mike Harbert/AllTrails
On Vivian Creek Trail, you’ll have the chance to see a pretty waterfall and enjoy the peaceful sounds of water dropping down the rocks. There’s a little bit of everything on this amazing hike.
Alfredo Aipat/AllTrails
There’s nothing quite like making it to the summit, though. This is the feeling mountain climbers live for!
Michelle Duong/AllTrails

Whether it’s your first time on San Gorgonio Mountain or you’ve made the trip before, with such a long hike, there are bound to be new things you’ll pick up on every time. Hiking the tallest mountain in Southern California is a real challenge, but for those up to the task, it’s one of the most rewarding hikes you can take.

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San Gorgonio Mountain, California 92305, USA