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Boreas Pass
Boreas Pass in summer
Elevation	3499 m./11,481 ft.
Location	Colorado,  United States
Range	Rocky Mountains
Coordinates	39°24.7′N, 105°48.2′W
Topo map	[1]
Traversed by	Unpaved road

Boreas Pass (el. 3499 m./11,481 ft.) is a high mountain pass in the Rocky Mountains of central Colorado in the United States. The pass is located on the continental divide, at the crest of the Front Range along the border between Park (south) and Summit counties.

The pass crosses the range where it divides the headwaters of the Blue River (a tributary of the Colorado River) to the north with South Park and the headwaters of the South Platte River to the south. It is traversed by Forest Service Road 33, a gravel road that is closed in winter but which is passable by many automobiles in good weather. The road over the pass goes north from the town of Como in the northern South Park northeast of Fairplay, crossing the path northward to Breckenridge. In good weather, it furnishes an alternative route to nearby Hoosier Pass, offering splendid views of aspen trees and nearby Mount Silverheels and the Tenmile Range.

The pass was formerly known as Breckenridge Pass in the 1860s, when it served as an early route for thousands of prospectors during the Colorado Gold Rush who crossed from South Park to look for gold in the valley of the Blue around Breckenridge. In 1866, it was widened to a wagon road that accommodated stagecoaches. In 1882, under the direction of Sidney Dillon of the Union Pacific Railroad , the Denver, South Park and Pacific Railroad (by then controlled by the Union Pacific) begun laying narrow gauge tracks up the pass, which Dillon renamed in honor of Boreas, the Ancient Greek god of the North Wind. The line was a spur to Breckenridge (eventually extended to Leadville) off the company's main line from Denver through South Park. A roundhouse, still in existence, was constructed at Como at the junction of the lines. The rail line over the pass was a major engineering feat, primarily because of the winter snows at high altitude. When completed, it has dozens of snow sheds along its route, which approached a 4% grade in many places. A town of Boreas, now a ghost town, was constructed at the summit, primarily to house workers to clear the line in winter. The line was abandoned in 1937, along with most of the company's right-of-way. After World War II, the Army Corps of Engineers reconstructed the route for automobile traffic. On the north side of the pass, Forest Service Road 593 leads to the 1880s ghost town site of Dyersville, as well as many abandoned mining sites.

• USGS TopoZone listing

Coordinates: 39°24.7′N, 105°48.2′W