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Colorado > Area 13.1 Half Marathon & Terrestrial 5K
Castle Rock, CO  •  Saturday, September 14, 2013  •  Course Map


Like its counterpart race event in Roswell, Ga. -- now part of a race series that will spread to Austin, San Francisco and New Orleans, La., in the coming year -- the Area 13.1 Half Marathon and Terrestrial 5K in Castle Rock's alien theme beckons with the tagline, "they're coming -- will you escape the invasion?"

The race takes its name from Roswell, New Mexico's infamous Area 51, the site of the alleged alien landing back in the mid-20th century that has been a source of speculation (and conspiracy theories) for decades. The event also has a deeper purpose and meaning, as it serves as a fundraiser for the Matthew E. Russell Foundation and Life Connection Ministries, which supports the people of South Africa by building libraries, putting together feeding programs, educational outreach and more.

For runners in the Castle Rock race, there's both a 13.1-miler and a 5K event, which both will share the same starting line and time -- 7:00 PM at the Douglas County Fairgrounds and Event Center. From there, this nighttime race will take runners out onto the Seller's Gulch Trail and the East Plum Creek Trail, which runs parallel to its namesake East Plum Creek from the fairgrounds up to the neighborhood known as The Meadows, near Castle Rock Adventis hospital.

Once there, runners will reach the end of the East Plum Creek Trail and make the turnaround to retrace their steps in reverse along the path, all the way back to the fairgrounds for the race finish. Runners will have 3 1/2 hours to complete the half marathon, and organizers note that the course will close at 10:30 PM.

Race Weather & Climate

Located along the front range of the Rockies in central Colorado, about 30 miles south of downtown Denver, Castle Rock typically sees September temperatures that average between 46°F and 76°F, while rainfall is rare, averaging just over 1.2 inches for the month.

On the day of the race (Sept. 14), the average low is 47°F and the average high is 76°F.

Course Map

See the race route map for the Area 13.1 Half Marathon

Starting Time

7:00 PM


$70 for the half marathon, if registered by August 31, 2013
$85 between September 1 - 6
$95 between Sept. 6 and the day of the race (or until the race sells out)


To reserve your spot in the late summer 2013 running of Castle Rock's Area 13.1 Half Marathon or Terrestrial 5K race, register online at Active.com.

Official Race Website


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