2021 Lottery opens February 1st!

The legendary “Race Across The Sky” 100-mile run is where it all started back in 1983. This is it. The race where legends are created and limits are tested. One hundred miles of extreme Colorado Rockies terrain — from elevations of 9,200 to 12,600 feet. You will give the mountain respect, and earn respect from all.




We are excited to announce that the deferral registration window will open for the 2021 race on October 19th, 2020, and remain open through November 23, 2020. Please watch your inbox for a registration link from RunSignUp on October 19th and prepare to get registered! When you receive your registration link next week, please check out the FAQs on the event registration page for important deadlines and further information.

We understand that a lot has changed this year and some athletes are still uncomfortable with the thought of racing next August. If you would prefer to defer your 2021 entry to 2022 or 2023 we are happy to accommodate that request.

If you deferred into 2021:

During your 2021 deferral registration through your personal Reserved Entry link you will be asked to select either:  “Racing 2021!” or, “Please roll my deferral to 2022.” All athletes will still need to continue through and complete their registration.  If you choose to roll your deferral into 2022, you will receive an automated email from RunSignUp confirming your deferral within 5-10 days.

If you deferred into 2022/2023:

We will open deferral registration for the 2022/2023 LT100 MTB in November of 2021/2022 and you will receive an email confirming when registration is live for you to re-register through your Reserved Entry. Until then, rest assured that your deferral entry is safe and no further action is needed on your part.

Deferral and Refund options that were offered this summer. Deadline to select one of these options was June 16th:

Option 1a: Donate my entry to the Lake County School District via the Life Time Foundation (100% of proceeds to impact the lunch program in Lake County, which is currently serving 720 kids per day, breakfast, lunch and dinner.) As a thank you, we will provide you with guaranteed, non-complimentary entry into your choice of the 2021, 2022 or 2023 LT100 Run. Limited 2021 slots available.

Option 1b: Donate your entry to the Leadville Trail 100 Legacy Foundation, the foundation started by Ken Chlouber and Merilee Maupin and helps fund scholarships for all Lake County HS graduates. As a thank you, we will provide you with guaranteed, non-complimentary entry into your choice of the 2021, 2022 or 2023 LT100 Run. 

Option 2: Complimentary deferral option valid for 1-time use in your selection of the 2021, 2022 or 2023 LT100 Run. 

Option 3: Full refund on entry fee (excluding the service fees and add on merch)

There is a capacity placed on the slots available for the 2021 LT100 MTB & LT100 Run and they will be available on a first-come, first-serve basis. Once the capacity is met, you will have the option for 2022 and 2023.

2021 LT100 Run Event Information Coming This Winter!

2020 information:

If unsuccessful in the lottery process and you still wish to participate in the LT100 Run, please check out our qualifier events, Training Camp entries, coaching package opportunity and charity slots available.

Charity slots

Skip the lottery and guarantee your entry by registering with a charity. Competing on behalf of one of our official charity partners not only guarantees you a spot in the 2020 race, but also provides you the opportunity to make an impact in the community.

> View more on the Leadville Race Series Charity Partner Program.

Please note athletes must be 18 years or older on the day of the race to participate in the Leadville Trail 100 Run presented by La Sportiva. 

UTMB Points – A Leadville Trail 100 Run finish will award you 5 points for UTMB qualification. Learn more about this race here.

2021 LT100 Run Event Information Coming This Winter!

General overview of the weekend:


11am-4pm Packet Pickup


3am-3:45am Starting Line Open at the Corner of 6th & Harrison

4am Race Start


5am 25 Hour Cutoff Time – for runners awarded the large silver and gold trophy buckles

10am 30 Hour Cutoff Time- for runners awarded the small silver and gold trophy buckles

12pm Awards Ceremony

The 100-mile out-and-back course is in the midst of the Colorado Rockies. Low point, 9,200 feet; high point is Hope Pass, 12,600 feet. Majority is on forest trails with some mountain roads. Pacers allowed after the 50-mile point (exceptions only by request).

> View the Course Map

>View the Course Profile

Please note: Due to safety restrictions on the course wheelchair participation is not permitted.

All or part of this operation is conducted on Public Lands under special permit from the U.S. Bureau of Land Management.

This event is held on the San Isabel National Forest under a special use permit.

Course history

Since 2008, there have been six changes made to the Leadville Trail 100 Run course. The course was unchanged for many years before 2008. In 2017, we will return to the course that was last used in 2012. 

  1. County Rd 11A/Halfmoon Road to Twin Lakes Firestation. Halfmoon aid station was moved in 2009 due to a helicopter crash just before race day. Runners went a short way up Halfmoon Road then turned left onto Pipeline road. This change removed .3 miles from the full course distance and reduced the elevation gain by 750 feet.
  2. Halfmoon Road removed entirely in 2012. The access to Pipeline Road was rerouted past the gravel pits, adding about .7 miles to the round-trip distance and about 50 feet more elevation gain.
  3. Winfield Road/Colorado Trail change in 2012. The Winfield Road was finally removed from the course with the completion of the Colorado Trail into Winfield. This added 2.2 miles to the full-course distance and 365 additional feet of elevation gain.
  4. In 2013, a portion of the Colorado Trail near Winfield was removed. (View a map of the change). With a course distance about 2.7 miles longer in 2012 than in 2008, 2.3 miles and about 10 feet of elev gain were removed from a portion of the Colorado Trail near Winfield.
  5. In 2017, we will again use the Colorado Trail to access Winfield. This will add 2.3 miles and 10 feet of elevation gain to the course. 

Aid Stations
There are 13 well-stocked aid stations along the course. Cut-off times for the aid stations do apply.

Enter your goal finish time and see approximate race times, split times, and split paces required at various segments of the course for that desired finishing time.

Download file here.

UTMB Points – A Leadville Trail 100 Run finish will award you 5 points for UTMB qualification. Learn more about this race here.

2021 LT100 Run Event Information Coming This Fall!

Check out the 2019 Athlete Guide for detailed schedules, course information and more.
> View the 2019 Athlete Guide

Awards Ceremony will be held at 12:00 p.m. on Sunday, August 18th at the Lake County High School gymnasium. All awards and finisher jackets will be presented at this time and must be picked up in person at the Lake County High School gymnasium.

Awards will not be given to others and will not be distributed before or after the Awards Ceremony. Finisher sweatshirts will be distributed after the awards ceremony at the High School. The first 400 finishers will be guaranteed their sweatshirts the day after the race. If your sweatshirt is not printed overnight, it will be made and shipped to you free of charge. After October 31st, buckles and jackets will no longer be able to be shipped.

*Please note that 2019 awards will not be shipped until the end of our race series season, September 2019.

2021 LT100 Run Event Information Coming This Fall!

2020 information for reference:

The brand new Leadville Trail 100 Run All-Access Pass provides a premium package to athletes racing the Leadville Trail 100 Run presented by La Sportiva and will enhance the overall experience of the LT100 Run weekend. Pass members will receive a plethora of benefits that will not only benefit them, but their supporters as well.

Learn more HERE.

Your race checklist isn’t complete without your pacers and crew! Give them a way to commemorate this special experience with their own Leadville Race Series memorabilia. Visit our online store to check out our exclusive LRS crew shirts (pictured on right) to get your team prepared for race day!

*NEW – Interactive Pace Chart for your goal time can be found HERE!

Pacers are allowed after the 50-mile point (Winfield Aid Station). You may have as many pacers as you wish, although only one pacer at a time (until mile 99). Pacers may be picked up only at aid stations and approved crew points. A pacer must fill out a waiver prior to being on course. The waiver can be filled out at the aid station or you may print one here. The waiver must be turned in at an aid station to receive the proper pacer bib.

Pacing entails patience, tolerance and humor. The primary duties of a pacer include route finding, keeping the runner on pace, ensuring that the runner continues to eat and drink and making sure the runner leaves the aid stations with adequate clothing and supplies to reach the next aid station. Pacers are not allowed to push, pull, carry or tow the runner. Any special pacing situations or requests must be pre-approved by race management.

We strongly suggest you bring someone to crew for you during the race. Your race packet includes a hang-tag which should be displayed and readily visible on the crew vehicle at all times. Your crew is your personal responsibility. If your crew disregards parking instructions, race rules, directions or requests from race officials, you (the racer) will be disqualified from the race. Please make certain that your crew is not the one others complain about. We ask that your crew drive slowly and obey all posted warnings. There will be a Lake County Sheriff’s Officer patrolling road sections.

Crew access into aid stations may be limited. If crews are meeting you at aid stations, they should allow adequate time to park and walk to the aid station. It is your responsibility as a runner to make sure that race officials time you in and out of all aid stations. The race packet includes a map and directions showing access roads and crew access points, and crew and pacer rules. Crews should become familiar with the locations of aid stations, available access roads and race rules prior to the start. Crewing is restricted to approved locations, which include Pipeline Alternate Crew Zone and all aid stations except Halfpipe and Hopeless (near Hope Pass).

If you are interested in receiving a media credential for the LT100 Run, please fill out this form here.

If you plan on flying a drone, the deadline to submit pilot license and flight plan is August 1, 2021.

Additional media inquiries can be directed to Michelle Duffy.

Our races are Zero Waste events. Look for recycle and compost bins at every aid station and start/finish. Please discard any trash in an appropriate container. Intentional littering on the course will be grounds for disqualification. The course—on trails both public and private—travels past many historic sites and through areas of exceptional beauty. Help us keep them pristine.

We will be recycling all plastic, aluminum and cardboard during these races, and all our events. We’ll take care of this at the aid stations. At the start/finish, please ensure you place trash or recyclable materials in the appropriate containers, which will be well marked.

2021 LT100 Run Volunteer Information Coming This Winter!

From the very beginning, volunteers have made the Leadville Trail 100 possible. We truly appreciate all that our great volunteers do to make our races run smoothly and to make the racers’ experience unforgettable. If you are going to be in town for the Leadville Trail 100, we would love for you to join the family and pitch in. Thanks in advance for your help — we couldn’t do it without you!
Click the HERE to learn more!

2021 LT100 Run Event Information Coming This Winter!

Although we look forward to seeing  you at our events, we understand certain things may come up that prevent you from attending. Please make note of our deferral and refund policies:

Athlete Deferral Policy

LT100  RUN

  • Athlete can defer into the following year’s event and repay 50% of entry fee at time of registration. No deferral fee.
  • Should athlete defer less than 2 weeks prior to the event – defer into the following year’s event for free (no deferral fee) and repay full entry fee
  • No refunds, no transfers, no exceptions


  • Up to 2 weeks prior: Flat deferral fee into following year
  •  Less than 2 weeks – increased flat deferral fee
  •  Do not repay following year
  • No refunds, no transfers, no exceptions.

If the event cancels:

due to a series of reasons, including pandemic, natural disaster, etc.

Athlete Option 1: Deferral 

  • Complimentary, guaranteed entry into the following year’s event

Athlete Option 2: Refund 

  • 90+ days out – 70% refund
  • 60-89 days out – 50% refund
  • 30-59 days out – 40% refund

 No refunds on service fees or donations

Visit the link below to view results and photos from the Leadville Trail 100 Run