One of North America’s most famous ultramarathons, the Hardrock Endurance Run, begins on Friday in the San Juan Range of Colorado.

The famed 100-miler is headlined by returning champions Anna Frost and Kilian Jornet, both of who have consecutive win streaks to keep alive. Frost won in 2015 and 2016. Jornet won in 2014, 2015 and tied with Jason Schlarb in 2016. The challenging ultramarathon takes place at high altitudes and is a looped course beginning and finishing in Silverton, Colo. in the state’s southern region. Because of the course’s varying altitudes, runners experience vastly different conditions during certain sections of the race.

Canadian Adam Campbell returns to the Hardrock 100 racing his first 100-miler since a serious climbing accident in late August in British Columbia. Campbell finished third in 2014, after being nearly struck by lightning, in a race won by Jornet, the first of his three consecutive victories. Jornet set the current clockwise course record that year in 22:41:33.

RELATED: Ailsa MacDonald beats entire field at Sinister 7 in first 100-miler.

Speaking of the Spaniard, Jornet is coming off a win at the Marathon du Mont-Blanc and two summitting treks of Mount Everest in a six-day span. He ran 56K on Monday.

To finish the race, runners kiss a large rock, a piece of stone mining debris which features a picture of a ram’s head, situated at the end of 100 miles. Runners have 48 hours to complete the race, whose course is “designed to provide extreme challenges in altitude, steepness, and remoteness.” The race notes that the time cut-off is longer than most other ultras “due largely to the high elevations, which can cause altitude sickness or edema in some runners.”

Twenty-two of the 145 racers are female, which iRunFar says is due to the setup of the lottery.

Must-know information

Start time: July 14, 6 a.m. MDT (8 a.m. EDT)
Distance: 100.5 miles (161.7K)
Location: Silverton, Colo.
Direction: counterclockwise
Elevation change: 20,132m
Average elevation of the course: 3,409m
Highest elevation on course: 4,281m (summit of Handies Peak)
Defending champions and co-champions: Anna Frost (returning), Kilian Jornet (returning) and Jason Schlarb (returning)

Links

Hardrock 100 website

Start list

Live tracking

Updates (from iRunFar’s Twitter account)

The #HR100 hashtag on Twitter


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