The Thumbs Up Summer Slam returns to Estes Park, Colorado on July 18th, inviting runners to experience the unique challenge of ascending Prospect Mountain at sunrise and descending as the sun sets.
As dawn breaks over the Rocky Mountains, participants gather at Sunrise for an early start. The race begins with a trek along the Thumb Open Space trail, a recently designated public area that offers breathtaking views and challenging terrain. This 1km out-and-back route winds through lush forests and rocky landscapes, ascending to elevations of up to 7,522 feet above sea level as it skirts the base of Prospect Mountain.
The atmosphere on race day is one of anticipation and camaraderie among runners who have come from far and wide for this singular event. The morning light filters through dense foliage, casting long shadows that dance across the trail ahead. As participants move up the slope, they are greeted by cool mountain air tinged with hints of pine needles; a stark contrast to the heat of summer below. By late afternoon, as the sky turns golden and the sun begins its descent toward the horizon, there's an electric sense of accomplishment among those still pushing forward.
The Thumbs Up Summer Slam has quickly become a highlight for endurance runners eager to test themselves against both nature and time constraints. Since its inception in recent years, it has drawn small but dedicated crowds who relish the opportunity to explore this newly accessible open space while supporting local conservation efforts. Each participant receives unique pins at three significant milestones: 14 ascents marking Estes Park’s elevation; 18 ascents reaching Deer Mountain; and a final push up to Longs Peak, one of Colorado's most iconic peaks towering over the landscape.
The course itself is an intricate blend of natural beauty and physical challenge. Runners begin their ascent from the Thumb Open Space trailhead located off Prospect Mountain Road near Estes Park’s eastern boundary. The terrain here features a mix of soft but firm trails that wind through dense pine forests, offering respite from direct sunlight while still providing glimpses of distant mountain ranges. Aid stations are strategically placed every kilometer along this out-and-back route to ensure hydration and energy replenishment throughout the day.
As evening falls on July 18th, conditions will vary as they do in Estes Park’s high country: expect temperatures that range between a cool morning low around 9°C and a warm afternoon peak of approximately 25°C. The trail is firm yet slightly soft underfoot, with an average wind speed of about 3 meters per second which can make for breezy conditions particularly as the day progresses into cooler evening hours. Runners should prepare for limited chances of rain but be mindful of UV levels reaching very high intensity throughout most daylight hours.
Sun up to Sun Down
Start: 07:10:00 • Fee: $100.00
Getting ready for this event involves a bit more than simply signing up; participants must register online via the link provided and pay their $100 entry fee by the deadline. To secure your spot, visit https://ultrasignup.com/register.aspx?did=137672 and complete all required fields before the race day to ensure you’re ready for an unforgettable adventure.
On race morning, head over to 101 Peak View Dr in Estes Park by 6:45am sharp. Be prepared to drop off any necessary supplies as there is no parking available at the start line itself; arriving via bike or carpooling with friends will be key to getting set up properly before dawn breaks. Remember, this race caters specifically towards those aged 18 and above due to its challenging nature.
The Thumbs Up Summer Slam promises a day filled with scenic beauty, personal challenge, and community spirit in the heart of Estes Park's natural splendor on July 18th, making it an event not just for runners but anyone who appreciates the majesty and solitude found high up among Colorado’s peaks.
