Slacker Half Marathon, Relay & 4-Mile

Saturday, June 22, 2023 • Georgetown, CO • Course Map

Billed by race organizers as the “highest downhill half marathon in the country,” the aptly named Slacker Half Marathon features a starting line at the lofty elevation of 10,630 feet above sea level and a running course that is entirely downhill, descending by the end of the race to 8,400 feet.

The starting line lies at Colorado’s Loveland Ski Resort, and takes runners on a combination of dirt and paved roads, leading participants through beautiful wetlands, natural waterfalls, stunning views of the Continental Divide, and historic mining remnants.

By the middle miles of the race, the course shifts to paved surfaces, with views of the Continental Divide and many mining areas, while the last few miles of the race take runners from Silver Plume to Georgetown along paved bike trails with views of the Georgetown Loop Railroad.

The relay races are open to 3-person teams, and the 4-mile race takes place over the last four miles of the half marathon course.

Here’s what past runners who’ve taken part in the race have to say about it, from comments left about the course on the old version of our site:

“I told my I’m officially a slacker and for that I thank you! I thought the race was uniquely Colorado, which made for a wonderful experience. The volunteers and residents and businesses of Georgetown were incredibly welcoming. Thank you! For these reasons, and the fact that a mostly downhill at altitude is a real challenge and any athlete-at-heart will love!”

“I LOVE Slacker! It was a bummer they’ve paved the forest road though, as running on the dirt trail was a favorite part of the race. Great race and day!”

“I actually did this in June and loved it! First ever and unexpectedly got 2nd in my category 🙂 It was all downhill though so probably not that great of an accomplishment haha.”

“For the most part I would say that it is 90% downhill. There are some areas that you will have to go uphill.”

Because of it’s unique, scenic course – we consider this race to be one of the best in the world.

Runners on the course of the Slacker Half Marathon

Race Weather & Climate

While the race takes place just as summer is getting started across much of the rest of the U.S., weather conditions are still mild in this high-altitude Rocky Mountain town just to the west of Denver.

On race day (June 24), the average low is 38ºF and the average high is 73ºF.

Past Results

Course Map

See the race route map for the Slacker Half Marathon here.

Starting Time

8:00 AM


  • $55 and up – half marathon
  • $35 and up – 4-mile race


To reserve your spot in the 2023 running of Georgetown’s Slacker Half Marathon, Relay, or 4-mile race, register online at here. Registration opens at midnight on 12/31/2023, with the first 150 people to sign up, getting a discounted rate of $50.

Official Race Website

See more races — $50 or Less, Trail Races, Colorado

2 comments… add one
  • Robert Taylor June 19, 2019, 6:11 pm

    Will the path just below Silver Plume be open? I know there is construction there. Will the surface be gravel? Just curious . THX

  • Frances Summerhill April 1, 2018, 1:12 am

    I’m unable to get to the event website to register this evening. The price goes up tomorrow so I hope you will able let me register at tonight’s rare before the entry fees increase tomorrow
    Thank you


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