100k Information

100k Race Details

The Worlds End 100k is a 63.8 mile single loop trail ultramarathon on 95% single-track/double-track. The course has an elevation gain of 12,395 ft with a net elevation change of 24,790 ft. We support you with 12 aid stations and challenge you with a strict 19 hour cutoff. We have a reputation as one of the toughest, most scenic trail 100k’s in the country.

2022 Western States Qualifier
Honored to be a qualifying race for the Western States 100.

Worlds End 100k Details:
Event date: Saturday September 26, 2020
Start time: 5:00AM
Cutoff time: 12 Midnight (19 hours)
Start/Finish/Bibs: Cliff Pavilion at Worlds End State Park
*Bib Pick Up: Friday 5:30PM to 7:45PM (Mandatory for all runners)
*Pre-Race Meeting: 7:45PM (Mandatory for all runners)
*Race Check-in: Saturday 4:00AM to 5:00AM (Mandatory check-in/no bibs given out)

Registration is first come, first served and there is a qualifying standard for the 100k race.
2020 Registration Date: December 7, 2019 (6PM).
Capacity: 150 runners
Cost: $165

100k Registration

Qualification Standard:
The difficulty of the terrain means this is NOT an entry-level race. Each potential participant will be reviewed by the race directors after we receive the completed registration. At a minimum, all participants must have completed at least one 50k trail race within the advertised cut-off time before signing up. This must be within 2 years of the registration date. If you have a race that is not a 50k but has a high degree of difficulty, it may be an exception to the above standard, just email us to find out if the race may qualify you. Be sure that your race is an official race with results published on a publicly available website. Timed races can not be used as a qualifying race. You must have completed a qualifying race before registering.

Service Requirement:
Worlds End Ultramarathon requires eight (8) hours of volunteer service by each participant. Please refer to the Service Requirement page for more details. You must have completed your service requirement prior to race day.

We will refund 50% of your entry fee minus any processing fees until May 16th, 2020. Race registrations are not transferable to other participants or future races, and transferring between distances (up or down) is not allowed. Please consider these factors very carefully before registering. Please use your registration profile to request a refund.

**Due to the need to reschedule the race to September, if you can not attend the race on the new day, you may request to receive a 100% refund starting May 1, 2020 until July 4, 2020. Please request your refund and as funds become available, your refund will be issued to you. If you WERE ORIGINALLY REGISTERED WHEN WE MOVED THE DATE and wish to hold your spot for 2021, please log into your account and select the deferral option. **

After July 4, 2020, participants are eligible for a 50% refund of the race fee until 9/19/2020.
Due to maintaining a waiting list, we do not do deferrals, bib transfers, or race distance switches.

Request a Refund

Driving Directions:

Cliff Pavilion Location:

100k Course Information

Below you will find the official elevation profile, course map, and aid station planner. Use the yellow buttons to view the PDF files of each document. You can download them to your computer and print them if you so choose to do so. If you would like to see a more interactive map of the course with an elevation profile, check out our map over at hellodrifter.com by Nick Knipe.

Aid Station Information

In an effort to be more sustainable and friendly towards the environment, the Worlds End Ultramarathon is now a cupless races. All runners will need to carry their own reusable cup throughout the race to use at aid stations.

The use of Ibuprofen or Naprosyn can lead to kidney problems when used in abundance and/or under stressful conditions. Aid stations will not provide these medications to any runner. If you feel the need to bring and use your own pain medications or anti-inflammatories, then you are willing to assume the responsibility for their use.

The aid stations are well stocked with fluids and a variety of foods. The fluids that are generally available are: water, hydration/energy drink, ginger ale and cola. The late stage aid stations will also generally have soup and hot coffee. The foods that are generally available are: salt replacement foods such as saltines, pretzels, chips; fruits such as oranges, bananas, and melons; potatoes, cookies, candies, sandwiches, etc. Aid stations also try to have their own unique foods available throughout the course. Generally vegetarian options are available but we cannot guarantee the ability to accommodate all dietary choices and restrictions.