Blue Sky Marathon & Half: Header

Start: Blue Sky Trailhead, Horsetooth Mountain Park. Fort Collins, Colorado
Distance: 26.7 miles (3,500′) or 13.1 miles (2,600′)
Min/Max Elevation: 5,300′-6,500′ Marathon / 5,300′-6,800′ Half
Average Elevation: 5,700′ Marathon / 5,900′ Half
Terrain: Marathon: 22mi dirt singletrack, 3mi rocky singletrack, 2mi dirt road; Half Marathon: 11mi dirt singletrack, 2.0mi dirt road
Fauna: Deer, abert squirrel, golden eagle
Registration Cap: 600
Time Allowance: 9 hours Marathon / 8hr15min Half Marathon
Date: October 18 (Marathon) / October 19 (Half Marathon), 2025