Preston Peak, Mountain summit in Siskiyou County, California, US

Preston Peak is a summit in the Siskiyou Wilderness of Klamath National Forest, northern California, reaching 2,228 m. It stands as the dominant feature of the wilderness: many surrounding peaks rise above 6,000 feet, but none comes within 500 feet of its height. From the top, the Pacific Ocean and the peaks of the Klamath Mountains and Cascade Range are visible on clear days.

John Hart, in Hiking the Bigfoot Country, reports that early travellers on the Klamath River, seeing the mountain above them, thought it was 10,000 feet tall, though it stands at 2,228 m. The Forest Service later designated the peak and its watershed the Preston Peak Botanical and Geological Area for its rare plants.

The Karuk name for the peak is keech'íihyan, recorded in the Karuk language of the Klamath River region. The name is the main cultural trace the sources document; the peak lies within the Siskiyou Wilderness, land associated with the Karuk and neighbouring tribes of northern California.

The summit lies in the Siskiyou Wilderness of Klamath National Forest, reached only on foot; no road or trailhead facilities serve the peak itself. Plan for a multi-day approach through steep, rocky terrain and carry water, since the wilderness has no developed campsites or supplies. Snow and storms can close access for much of the year, so check conditions with the forest service before setting out.

The Forest Service designated the peak and its watershed the Preston Peak Botanical and Geological Area for its rare plants. Alaska cedar and noble fir reach the southern end of their range here, sharing habitat with Brewer spruce and Port Orford cedar, both endemic to northwest California. A high-elevation stand of Pacific yew also grows on the peak.