Sundance to Spearfish Marathon
Race Day Weather
Comfortable temps, big temp swing, moderate wind
Mild 50°F temps at gun time mean comfortable early miles without overheating risk. Temps will climb significantly to 70°F by later miles, so expect fading conditions as the race progresses. Moderate winds around 14mph may affect pacing on open sections of the course. Moderate humidity at 72% is worth noting for effort level, especially in later miles.
Pace Calculator
Get forecast alerts for Sundance to Spearfish Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Sundance to Spearfish Marathon offers runners a predominantly downhill course through the scenic Black Hills, starting in Wyoming and finishing in South Dakota. The first 12 miles feature improved gravel roads winding through mountain meadows, valleys, and canyons, with a notable descent of 1,606 feet and a pass by the "Dances with Wolves" film site at mile 9.35. The final 14 miles are on paved roads, descending Spearfish Canyon Highway into Spearfish, with an additional drop of 1,364 feet. This USATF-certified course is ideal for those aiming to qualify for the Boston Marathon, as it is one of only two such courses in Wyoming and South Dakota.
