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Mammoth Trailfest
TrailUnited StatesCalifornia

Mammoth Trailfest 2026

24.09 – 27.09.2026Mammoth Lakes (United States)
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Pacing, fueling and crew sheet for the course you pick

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2’1306’988 m D+ ft D+

50 km31.1 miTrailfest 50klongest of 4 courses

At a glance

Mammoth Trailfest 2026 took place from Thursday 24 to Sunday 27 September 2026 in Mammoth Lakes (California, United States). Two distances to choose from: 26 and 50 km.

Longest course: Trailfest 50k, 50 km with 2’130 m D+ (43 m per km: mountain terrain).

The 2027 edition takes place on Thursday 23 September 2027. On Kliva, plan your pacing and nutrition for free, then send the plan to your watch.

A Mammoth-sized gathering of trail community races, fest, films, volunteer, partner, travel.
From the organiser

4 courses

  1. 26km16.2mi

    1’064 m D+3’491 ft D+

    avg 4%

    Trailfest 26k
    ITRA 1

  2. 50km31.1mi

    2’130 m D+6’988 ft D+

    avg 4%

    Trailfest 50k
    No index

  3. –

    Mammoth Triple Mammoth
    No index

  4. –

    24 m D-79 ft D-

    Woolly's 1K
    No index
    GPX

Course analysis

Woolly's 1K1.5 km0.9 mi27 m D+89 ft D+

2effort kmⓘ1.5 km on the map · feels like 2 km0.9 mi on the map · feels like 2 km
D+
27 m89 ft
D−
24 m79 ft
Max alt.
2’480 m8’136 ft

Segments

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Elevation profile: Woolly's 1K

2’460 m – 2’480 m8’071 ft – 8’136 ft

Race plan

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Pacing, aid stations and fueling timed to your effort on Mammoth Trailfest, in one roadbook.

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Where to stay

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Editions