Races
Kodiak Ultra Marathons
Big Bear Lake. San Bernardino high country. Sugarloaf at ten thousand feet twice. Holcomb Valley sand.
100 mi+18,651 ft-18,582 ft36 hours5,467 ft to 9,951 fttech 6/10Checkpoints per race bookSan Bernardino MountainsWSER qualifierOctoberWSER qualifier
Distance100 mi
Gain+18,651 ft
Loss-18,582 ft
Altitude5,467 ft to 9,951 ft
Technicality6/10
Air35°F to 85°F
- Start6,736 ft
- High9,892 ft
- Low5,502 ft
- Finish6,804 ft
- Sugarloaf Mountain at mile 50, cutoff 18 hours
- Finish at mile 100, cutoff 36 hours
Field, 2025 · 3-year sampleresults
Starters437
Finish rate75%
Median29:49
Sub-2443
Geometrycourse math
Steepest drop968 ft-8.6% over 2.1 mi
Night miles50 misunset near 17:00 local
Time over 8k ft12%
Course records
Men16:22:08Vincent BOUILLARD
Women19:31:17Lin CHEN
The cruxDouble Sugarloaf Mountain (10,000 ft) crossing
Course DNA
The Course
Rim Nordic start above Big Bear. Crab Flats and Camp Whittle open Holcomb Valley. Sugarloaf Mountain at 3,047 meters crossed twice. Bear Mountain and Snow Summit drop toward the lake. Pace the early miles. The split often shows at mile 50. 36 hours spans 100 mi on 75% trail. +18,651 ft shapes the middle miles.
The Work
Hypoxia at moderate elevation. Double Sugarloaf means climbing the same mountain on tired legs. Heat in Holcomb Valley and cold on Sugarloaf the same day. Stack altitude weeks before you load the second Sugarloaf crossing. Long October back-to-backs with night miles.
Kit
UTMB World Series mandatory kit. Warm layer for Sugarloaf at night. Dust mask for Holcomb Valley. October in Big Bear Lake, California: 35°F to 85°F. Pack for 14 stations and night if 36 hours runs long. Spare headlamp for the second Sugarloaf push.
Race Day
First Sugarloaf climb separates contenders. Balky Horse to Sugarloaf 2 is the back-half crux. Double Sugarloaf Mountain (10,000 ft) crossing decides the back half. Hold calories and keep aid stops under control with 36 hours on the clock.
Results
Kodiak Ultra Marathons finish lines.
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Sources (3)
- Field stats (2025): https://utmb.world/utmb-index/races/2452.kodiakultramarathonsbyutmb100m.2025?page=1
- Qualifier: wser: https://www.wser.org/qualifying-races/
- Course record (M): https://utmb.world/utmb-index/races/2452.kodiakultramarathonsbyutmb100m.2023?page=1