Date
Sat, 17 Oct 2026
Start
07:00
Venue
Blue Sky Trailhead, Horsetooth Mountain Park
Blue Sky Trailhead, Horsetooth Mountain Park
Countdown
October
A full trail marathon on a single loop, with a generous 9 hours on the clock and a mass start. Steady climbing, nothing brutal, and a field of a few hundred at most.
Key facts
01Carry a water bottle or bladder of at least 16 oz
02No dogs and no pacers allowed
039-hour cutoff, plus intermediate cutoffs along the way
Create a free training plan for the Blue Sky Trail Marathon & Half Marathon 43 km
7-day free trial, no card required
The course
The route
Blue Sky Trailhead
Distance43km
Total climb1,067m
StartElevation
0 kmDrag map to rotate39.6 km
2025 results
Who finishes, and how
#RiderTimeAvg speed
016802:44943.2 km/h
0216702:51904.6 km/h
0316802:56878.9 km/h
143
Finishers
0:04:53
Median time
528.0 km/h
Median speed
Overall · 2025 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
Training
Training for the Blue Sky Trail Marathon & Half Marathon 43 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Blue Sky Trail Marathon & Half Marathon 43 km plan targets
Typical sessions
43 km with 1,067 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Blue Sky Trail Marathon & Half Marathon 43 km plan.
7-day free trial, no card required.
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