Ashdown Gorge Wilderness, Protected wilderness area in Iron County, United States.

Ashdown Gorge Wilderness is a federally protected wilderness area on the western edge of the Markagunt Plateau in Iron County, Utah, known for its deep, steep-sided canyons carved into the rock. The land covers a range of terrain types, from forested plateau areas at the top to exposed canyon walls and narrow valley floors below.

The U.S. Congress designated the 7,043-acre Ashdown Gorge Wilderness in 1984; the U.S. Forest Service administers it within Dixie National Forest. The gorge takes its name from George Ashdown's family, who set up a sawmill there in 1898. In 2006, Iron County officials considered a proposal to expand Cedar Breaks National Monument to include the wilderness, private inholdings and nearby Flanigan Arch, renaming it Cedar Breaks National Park with congressional approval.

The name Ashdown comes from a sawmill operator who worked in this valley in the late 1800s, and that history quietly shapes how locals think about the land. Hikers today walk through the same canyon floors that were once used for timber work, though the forest has long since grown back.

There are no facilities of any kind inside the wilderness, so visitors should carry enough water, food, and gear for the full day or overnight stay. Trails can be steep and unmarked in parts, so a map and some route-finding experience are helpful before heading in.

Bristlecone pines grow on the upper plateau, and some of these trees are around 1,000 years old, though they look small and gnarled compared to much younger trees nearby. The wilderness shares a boundary with Cedar Breaks National Monument, so from certain spots along the rim you can look directly into the red and orange rock formations next door.