Trail ultramarathon · United States
9–11 October 2026 · Big Bear Lake, California
100K: Sat, 10 October 2026
A Southern California mountain ultra weekend around Big Bear Lake with altitude, forest trails, and large US trail-running awareness.
Entry · 100K · 2026 edition
The organizer listed 100K as full on 30 Sep 2026. The organizer lists other routes to a place below.
Other routes the organizer lists: UTMB Cares charity bibs (100K, 50K, 21K).
Subscribe to these entry dates (updates when the organizer's dates change and we recheck them) · Download .ics. Separate from any training calendar; remove it any time in your calendar app.
From the organizer's page, checked 30 Sep 2026. TrailSplits does not know whether you have a place; the organizer is the final word.
Kodiak Ultra Marathons by UTMB is a trail ultramarathon scheduled for 9–11 October 2026 in Big Bear Lake, California, United States. TrailSplits currently includes 5 mapped courses for this event, with course maps, elevation profiles, weather context, and pacing tools for the uploaded GPX data.
How to get a place: Direct registration; the October 2026 edition is sold out except the 10K. A presale for the 2027 edition runs 9-19 October 2026. Organizer's page, checked Thursday 1 October 2026.
TrailSplits is a free, independent route & pacing companion — not the official race. Visit the official Kodiak Ultra Marathons by UTMB site →
The organizer lists 100K at 99.7 km and +3,121 m for 2026; the course file mapped here (the organizer's 2026 file) measures 131.8 km. The organizer's figure and its own file for this edition disagree by more than measurement explains; plans and pacing here use the mapped file, so check the organizer's race page for the current route. Organizer's race list, checked Wednesday 30 September 2026.
Finishing 100K earns 6 Running Stones (100K category) toward the UTMB World Series Finals lottery. How Running Stones work.
Racing more than once next year? Add 100K to a season and see whether your races work together.
Inspect the official course track on a topographic map, through its elevation profile, or in 3D.
› running direction two lines: out and back on the same path kilometres
Selected distance
Vert-focused blueprint with route-finder links into the Planner.
Prepare and return
Keep this course, its training plan, calendar and future course updates together in your private My Races page. Saving does not publish your workouts, pace or progress.
Race route lab
Open the official course in Planner, then choose a nearby start point to build a shorter loop that matches the course demand. This course averages about 31.4 m climb per km.
Sat, 10 October 2026
Send to your watch
Get the official course as a clean GPX or a Garmin TCX course, with step-by-step instructions to load it onto a Garmin, COROS, Suunto, Wahoo, or Komoot — free, no account needed.
Compare your training
See how faithfully your rehearsal route matches the real race. The official course for 100K loads as Route A — upload your training route to compare distance, elevation gain, estimated time, and how much of the course you actually cover.
Course analysis
See the 100K course broken into its major climbs and descents in order — length, gain, average grade, and steepness — so you know where the crux is and how to pace and fuel it.
Race-week reminders
A free browser notification in the final week — the course crux, the weather window, and loading the GPX onto your watch. No app, no email, no account.
Kodiak Ultra Marathons by UTMB 2026 races run 9–11 October 2026 in Big Bear Lake, California; the 100K is on Sat, 10 October 2026. Check the official race site for registration deadlines and final details.
5 distances (10–161.1 km). The longest course is 161.1 km with about 4,880 m of vertical gain — a demanding mountain course.
The 100M course has a 36-hour cut-off, an average of 13.4 min/km to finish in time. TrailSplits' cut-off pacer shows the buffer at each aid station.
Yes. TrailSplits gives you the course map, an interactive elevation profile, a 3D flyover and a downloadable GPX for every mapped distance — free and with no sign-up.
Each distance has a free, course-specific 16-week training plan built around its distance, vertical gain and cut-offs, plus a pace and cut-off calculator.
No. TrailSplits is a free, independent route and pacing companion. For registration and official rules, visit https://kodiak.utmb.world/.
Load the GPX directly into TrailSplits for surface analysis and terrain intel.