Rattlesnake Canyon, Natural canyon in Mesa County, Colorado, United States.

Rattlesnake Canyon is a canyon in Mesa County, Colorado, within the Black Ridge Canyons Wilderness. It holds nine natural arches, the second-highest concentration in the United States after Arches National Park. The photograph shows a broad sandstone arch with a roughly rectangular opening, horizontal banding on the lower wall, and rows of small rectangular marks on the right pillar.

The canyon sits within McInnis Canyons National Conservation Area, which was created to protect Colorado's geological landscape. This protected status ensures the canyon's natural character is maintained over time.

The arches carry names used by hikers and mapmakers: Cedar Tree Arch is also called Rainbow Arch, East Rim Arch is known as Akiti Arch or Centennial Arch, and Bridge Arch as Hole-in-the-Bridge Arch. The Arches Loop Trail passes six arches before reaching Cedar Tree Arch, then climbs steep sandstone slopes and moqui steps to the canyon rim.

Two main access routes exist: a 15-mile (24 km) round-trip hike from Pollock Bench Trailhead or a high-clearance vehicle via Black Ridge Road to Upper Trailhead. Either way requires preparation for remote desert conditions and long exposure to sun and heat.

Cedar Tree Arch, also called Rainbow Arch, has a span of 76 feet and an opening height of 43 feet. The canyon's nine arches rank second in the United States after Arches National Park. The right pillar of the arch carries rows of small, evenly spaced rectangular marks cut low on the sandstone.