Boulder Backroads Half Marathon & 10K

Saturday, September 28, 2019 • Boulder, CO • Course Map

The foothills of the Colorado Front Range Mountains are the backdrop along the course at this race, which takes runners on a mostly off-road course through the countryside just north of the city, along mostly dirt roads and quiet rural lanes.

Runners see farms, cottonwood groves and several ponds along the out-and-back course’s rolling hills, which starts and finishes near the Boulder Reservoir Park and Sixmile Reservoir just outside town.

Colorado’s rugged outdoors is the setting and with it comes a steep challenge for runners who take part, namely the long, steady climb in elevation from the starting line all the way up to the half-way point in the race, along North 41st Street.

The course climbs roughly 300 feet in elevation from the start to the half-way point, from an elevation of about 5,200 feet above sea level at the starting line near the reservoirs to nearly 5,500 feet above sea level at the turnaround point.

The good news is, of course, that what goes up must come down — after running a mostly uphill race for the first 6.5 miles of the course, runners get to follow a mostly downhill course on the way back to the finish line.

Be sure to bring a sturdy pair of sunglasses for this run, as the sun is often out this time of year for the race, and Colorado’s wide-open blue skies and bright sun necessitate protection during the event.

Also, because the race takes place at over 5,000 feet above sea level — and many participants train at our near sea level — race organizers encourage entrants to allow themselves a few days to acclimate to the Colorado altitude before they take part in the race.

View of the Boulder Reservoir, Colorado. (Photo by SparkFun Electronics/flickr)

View of the Boulder Reservoir, Colorado. (Photo by SparkFun Electronics/flickr)

Race Weather & Climate

Located just to the east of Colorado’s Rocky Mountains, about a 30-mile drive northwest of Denver, the city of Boulder typically sees mild weather conditions as the seasons are changing from summer to fall, especially in the early morning when this race takes place.

  • Sept. 28 average low temp: 43ºF
  • Sept. 28 average high temp: 72ºF

Past Results

Course Map

See the race route map for the Boulder Backroads Half Marathon.

Starting Time

7:15 AM

Course Time Limit

4 hours


  • $75 and up for the half marathon
  • $35 and up for the 10K


To reserve your spot in the 2019 running of the Boulder Backroads Half Marathon or 10K race, register online at

Official Race Website


Ever run in the Boulder Backroads races? Share your impressions here, or post your review in the Comments below.

See more races in: September, Colorado