The Poudre Canyon is a narrow verdant canyon, approximately 40 mi (64 km) long, on the upper Cache la Poudre River (called the "Poudre" for short) in Larimer County, Colorado in the United States. The canyon is a glacier-formed valley through the foothills of the Front Range of the Rocky Mountains northwest of Fort Collins.
The canyon begins in northern Rocky Mountain National Park, at an elevation of approximately 9,000 feet, where the Poudre descends from near the continental divide. It winds gently to the northeast, then east, descending the slope of the Colorado Tertiary Pediment, emerging through the southern end of the Laramie Foothills north of Bellvue at an elevation of approximately 5,000 feet. Except for the small upper portion of the canyon north of Rocky Mountain National Park, State Highway 14 runs through the canyon. The route of the highway provides the principal vehicle access to the canyon and furnishes a road link between Fort Collins and North Park on the western side of Cameron Pass, which is accessible from the upper canyon. Most of the canyon is within the Canyon Lakes Ranger District of the Roosevelt National Forest, which is headquartered in nearby Fort Collins.
The flanks of the canyon wall are gently sloping and forested along most of its length, with the exception of several "narrows", at which the river has carved through recent formations leaving behind large glacial debris. The canyon is inhabited along most of its length downstream from Kinikinik. All of the communities in the canyon are unincorporated. Most of the habitation is the form of small cabins, some of which are inhabited only during season. Resort cabin communities for fishing and hunting are found sporadically along the canyon downstream from Rustic, which at one time in the late 19th century was a bustling summer resort, and burned down in 2008. The relative isolation of the canyon compared to ones further south along the Colorado Front Range gives a tranquil atmosphere with only small-scale tourist enterprises. The canyon is distinctly less developed than the Big Thompson Canyon west of Loveland. The commercial establishments, notably in Poudre Park, cater mostly to local clientele except during the fishing and whitewater rafting season, when the canyon receives a modest number of regional and national visitors. Colorado State University operates a small campus in the mountains at Pingree Park, which is named for George Pingree, an early white settler in the canyon in the 19th century. Near Pingree Park is Sky Ranch Lutheran Camp, a summer camp affiliated with the Evangelical Lutheran Church in America.