Registration for 2024 will open on Tuesday, November 1, 2023 at 6:00 am (MST) on UltraSignup

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100 mile: $260
100 km: $235
50 km: $205

This includes a racer garment and etched finisher rock.

Racer Limit:
370 racer registration limit:
– 100 mile: 65 racers
– 100 km: 145 racers
– 50 km: 160 racers
*Minimum age for racers or pacers is 18 years of age (Note: Pacers are only allowed for 100 mile distance).

Registration Withdrawl:

  • No bib transfers allowed.
  • If you withdraw from the race, you will automatically receive a partial rollover credit for next year’s race. To withdraw from the race, you can:
    • Use the “Edit” link on your registration receipt
    • Use the registration history in your UltraSignup account (Click Account Info / Registration History / Edit link for Lost Soul Ultra)

Distance Changes:

  • You may downgrade distance free of charge in UltraSignup until August 11, 2024
  • To upgrade distance from 100 km to 100 miles, please contact

Garment Sizing:

Our racer garments need to be ordered 10 months in advance so:

  • If you register by November 11, 2023 will receive a North Face racer garment
  • If you register after November 11, 2023 will receive a LSU t-shirt and buff.

Facebook page:
or search for “lost soul ultramarathon”



If you are unable to register for our race, here are some alternatives: Beaver Flat 50, Lewiston Ultra, River’s Edge Ultra, Blackspur Ultra