ALPHA 5K CHALLENGE: Early Bird Registration MAY-NOV 2026
About the Event
Running enthusiasts are invited to experience the scenic beauty and challenging terrain of the Annual Mountain Trail Race on September 15, 2026. Nestled among lush green forests and towering peaks, this race offers runners an unforgettable journey through some of nature's most breathtaking landscapes. The course winds its way along rugged trails that twist and turn through dense woodland, offering glimpses of serene lakes and cascading waterfalls. Participants will encounter a variety of terrains including steep climbs, rocky descents, and stretches of soft dirt paths. The race is designed to test both endurance and agility as runners navigate the challenging route. In addition to its stunning natural beauty, the event also features well-marked trails, clear signage at key points along the course, and aid stations equipped with water, energy gels, and medical support for all participants. Runners will be cheered on by enthusiastic spectators throughout their journey, creating a vibrant atmosphere that adds to the excitement of the race. Whether you are an experienced trail runner or looking to challenge yourself in new terrain, this event offers an incredible opportunity to push your limits while enjoying one of nature's most beautiful settings. Don't miss out—register now for what promises to be an unforgettable day on September 15, 2026. For those interested in participating, early bird registration is available through November 30, 2026, offering a chance to secure your spot at reduced rates before the event fills up.
Races Offered
ALPHA 5K CHALLENGE: Early Bird Registration MAY-NOV 2026
Sep 15, 2026
straighten
Distance —
5K
terrain
Type —
Running
timer
09:30
sell
$0.00 - $314.90
Weather History
These values represent the 3-year monthly averages for September in Boulder.
thermostatTemperature
10.6° / 25.4°
wb_sunnyFeels like
8.0° / 22.2°
light_mode
Avg sunshine hours
11h 15m
water_drop
Avg rainfall
1.2 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
7.4 km/h (Light breeze)
opacity
Sweat loss rate
Moderate
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (5.0)
humidity_mid
Humidity
44.1%
wb_twilight
Sunrise
06:42
nightlight
Sunset
19:07
About Boulder
Learn more about the host city, Boulder.
Boulder is a home rule city that is the county seat of, and the most populous municipality in, Boulder County, Colorado, United States. With a population of 108,250 at the 2020 census, it is the 12th-most populous city in Colorado. Boulder is the primary city of the Boulder, CO Metropolitan Statistical Area, which had 330,758 residents in 2020, and is part of the Front Range Urban Corridor.