The Roxborough Ultras returns to Littleton, Colorado on August 15th as a challenging ultramarathon event in Roxborough State Park. This race offers two fully marked courses: the 50K and the longer 80.5K route, both of which take place entirely off-road through rugged trails.
On race day morning at around 6am, temperatures are expected to be approximately 23 degrees Celsius with a slight chance for some light rain throughout the day, falling mostly in the afternoon hours before sunset. With an average humidity level hovering near 48%, runners can expect dry conditions but will need to manage hydration carefully due to limited natural water sources along the course.
Roxborough Ultras has been running since its inception as a single-year event and is known for supporting local causes through participation fees, which directly fund community scholarships. The race attracts seasoned ultramarathon enthusiasts who appreciate both the physical challenge and scenic beauty of Roxborough State Park's trails.
The courses traverse some of Colorado’s most iconic trail networks within Roxborough State Park, featuring extended climbs with limited shade and long out-and-back segments that test endurance and pacing skills alike. Aid stations are strategically placed but spaced further apart than in shorter races to simulate more realistic conditions faced by ultrarunners on longer distances.
August weather typically brings hot daytime temperatures ranging from a minimum of 15 degrees Celsius early morning up to a maximum around 31 degrees during peak hours, with an average wind speed at eight kilometers per hour and UV index reaching high levels due to Colorado’s elevation. Participants are reminded to pack sunscreen and stay hydrated as water sources on the trails may be unreliable or non-existent.
The Roxborough Ultras offers two main distance options: a grueling 50K for those looking to test their limits over a half-century of trail running, and an even more demanding 80.5K journey through Colorado’s breathtaking landscape in Roxborough State Park.
50 miler
80.5K • Start: 06:00:00 • Fee: $250.00
50K
50K • Start: 06:00:00 • Fee: $200.00
Registration can be completed online at the official website https://ultrasignup.com/register.aspx?did=133835 with fees set to $200 for the shorter distance and $250 for the longer race. Early bird discounts are available until May 1, after which pricing remains consistent.
Bib pick-up will take place on Friday evening from 4pm to 7pm at Roxborough State Park’s visitor center where participants should bring their photo ID along with a printed confirmation of registration if possible but digital copies also accepted via phone or tablet. On race day morning, all runners must be present at the start line by 6am sharp.
Starting off in Littleton's Roxborough State Park, the course winds through scenic and challenging terrain that requires careful planning and execution from every competitor. Age requirements are set for anyone aged eighteen years or older as per state regulations.
The Roxborough Ultras in Littleton, Colorado on August 15th is a testament to both individual endurance and community support. Runners gather annually to push their physical limits while contributing to local scholarships through participation fees, making this event not just about the race but also about giving back to the community that supports these challenging endeavors.
