What’s it like to pace or crew the Leadville 100 Ultramarathon?

Ultramarathon and beginner are two things that you may not think go together. While beginner runners certainly can’t stick with someone for 50 miles (the maximum length you can be a pacer runner at Leadville), there is absolutely a place for us at one of the most iconic trail races in the world.

Even if you aren’t a beginner runner, there can be a steep learning curve if it’s your first time in Leadville or if you haven’t been part of an ultramarathon before. This guide will cover just about everything you need to know, focusing on crewing since it’s the most beginner-friendly option.

What does it mean to crew?

First, let’s all get on the same page. Running an ultramarathon is a really difficult thing to take on, so most races recommend you have a crew to support you along the way. The person or people who make up the crew meet their runner at some or all of the aid stations along the way.

Your runner wants to spend as little time at the aid station as possible so they can get back on the course and finish the dang thing. The crew arrives at each aid station well ahead of their runner with a bin of supplies you’ve organized with them ahead of time and/or the drop bag they packed for that aid station. The aid stations at Outward Bound and Twin Lakes let the crew pick up a runner’s drop bag, which is a handy time-saver.

Once you get to the aid station, you set up shop and wait for your runner to arrive. Once they get in, you leap into action like a NASCAR pit crew and get them in and out as efficiently as possible.

Of course the ONE photo I took all day was of all the dudes helping our male runner. Ladies were represented too, I promise!

You make sure their pack is full of all the food and water they need, that they have appropriate clothing for the next leg (in Leadville, runners have a river crossing, 15,000+ feet of elevation change, and very chilly nights, so this is a must!).

The crew is critical because you need at least one person who is reasonably well-rested, not worried about running, and whose sole focus is “do we have everything we need?” This only gets more important as the race goes on and the runner’s cognitive abilities and general executive decision making get more and more compromised. You’re their back-up brain! Plus it’s a big morale boost for runners to see friends and loved ones throughout the race.

What does it mean to be a pacer?

For the last 50 miles of Leadville, runners are allowed to have one person run with them. This is a pacer. You’re there to keep them moving at a steady pace (whether they have a time goal or simply need to finish within the time cut-off) and serve as a kind of on-the-go crew, particularly once nighttime arrives and fatigue sets in!

For Leadville, you’re also allowed to carry the runner’s pack for them. But mainly, you’re there make sure they’re eating, drinking, moving, and at least somewhat happy (as happy as you can be trudging through 100 miles). If you have cell service, you can also communicate to the crew what your runner might want at the next aid station.

Pacing is a delicate balance of knowing when to encourage someone, when to give them some tough love, and when to go easy on them. It can be difficult to pace someone you don’t know or if you aren’t familiar with long-distance running yourself, but trust your instincts and discuss what kind of feedback motivates your runner ahead of time.

Trying to stay warm before my leg of pacing! Behind me is the spread for three runners – it’s more organized than it looks!

Most sections of the race are at least ten miles, but it’s possible to be a beginner runner and help pace. There’s a four-mile section that is actually incredibly helpful for a runner to have company for because it’s in the middle of the night through a very boring cow field.

If you have a training goal of running a longer leg, get after it! Just remember that this is not at all about you. You run when your runner wants to run, you run at their pace, you walk when they need to walk – your runner comes first. You’re there to support them, not to worry about your own distance or time goals.

What do I need to know to crew?

Honestly, it’s not rocket science. You have to be organized and able to follow your runner’s directions. You also need to be flexible, be able to think on your feet, and have a good sense of humor.

You need to take care of yourself (more on that later) but also keep in mind that you’re doing this in service of someone else’s goal, not for yourself. It’s not the end of the world if things go wrong, and it’s not helpful to get mad at your runner or fellow crew members. You just need to problem solve!

Plans change, things go off the rails, runners forget to tell you things, but at the end of the day it’s a wonderful privilege to be worried about the logistics of an ultramarathon. If that’s the worst thing happening in your life, you’re doing pretty well.

What should I do before the race?

Familiarize yourself with the aid stations. The race is one long out and back, so the runners go through every aid station twice. As of 2021, crew and pacers can access the May Queen, Treeline (unofficial crew access between Outward Bound and Halfpipe, a lot of people just call it Halfpipe or the field at Halfpipe), and Twin Lakes.

Remember how I said you need to be organized and have a sense of humor? I forked up the directions to the Treeline (unofficial) aid station on our way back from Twin Lakes, and my friend and I ended up driving to Mount Elbert by accident.

Fortunately, we had over an hour of cushion, so we still arrived to the actual aid station with plenty of time and didn’t miss our runner. And the drive was really beautiful, to be honest.

But also to be honest, I had a brief panic attack when I realized my mistake. My friend just thought it was a funny and interesting side adventure. Fill your crew (and your life) with people like that!

Crews, pacers, runners, and the beautiful views at Twin Lakes.

Make a plan. It’s important to sit down with your runner ahead of the race (even if it’s just the night before) and familiarize yourself with what they’re packing in their drop bags or what they would like you to bring to every aid station. That way you’ve discussed everything when they are alert and well-rested (the opposite of what they will be in the middle of the night).

For example, my runner really wanted hot soup at a particular point so I was waiting for her at that aid station with a thermos in hand. And, because I forgot to ask where they were ahead of time, I was scrambling to find her caffeine pills when she specifically asked for them later on.

Know when they’re arriving (approximately). You also need to estimate when they’ll be arriving at each aid station so you can plan accordingly. You should be ready to see your runner at least 30 minutes before you think they’ll arrive, which means you are physically at the aid station with all of their stuff ready to grab and go.

Buffer time is most important for getting to Twin Lakes it’s kind of a sh*t show to get to. In 2019, we had to park almost a mile away from the aid station at Twin Lakes. In 2021, we got to Twin Lakes at probably the busiest time (11 am) and ended up frantically walking/jogging two miles to try to meet our runner.

I love a good spreadsheet, so I put all of this information in a Google sheet, downloaded the app, and kept it handy throughout the weekend (remember to make your sheet available offline). You can see it here.

Cell service will be spotty. Download the race guide, maps, and directions to all of the aid stations ahead of time. You also won’t be able to communicate with your runner or track exactly where they are, however you can sign up for text alerts for when they go through each aid station. This helps you guess more accurately when they will show up, but the app (Athlinks) is honestly incredibly unreliable. It gave my friends a scare in 2021 when it texted that their runner DNF’d (did not finish) when in reality he was still running.

In the second half of the race, if they have a pacer and you have the pacer’s phone number, you may be able to call or text them to get an update on roughly how far out they are. But keep in mind that the pacer may not be able to regularly check their phone because they’re keeping the runner going!

What should I bring to every aid station?

Pack light and bring a few things for yourself. This might be difficult if your runner is channeling any anxiety into packing ALL THE THINGS, but try to pare down as much as you can.

Bring only the essentials for yourself: a camping chair, water, snacks, an extra layer, sunscreen, your wallet, and your phone. Always make sure to bring a camping chair (the Helinox Chair One has come in SO clutch here because it’s so lightweight, but it is expensive).

I keep more of my stuff in the car and repack what I need to bring in my backpack for each aid station. This includes hand sanitizer, bug spray, plenty of snacks, and extra sunscreen along with all of my layers for the weekend.

You’ll likely also have a bin or some other container of your runner’s stuff to carry.

The bin! And everything that went in it, plus some back up supplies that I brought in my backpack.

Every aid station has port-o-potties that the crew can access, but you can’t access the water or other snacks at the aid station. Those are for pacers and runners only, so make sure you stay hydrated throughout the day (10,000 feet of elevation is no joke).

What should I wear?

The temperatures (and weather in general) can vary wildly. You’ll need plenty of warm layers for overnight, but in the daytime, it’s quite hot in the sun (and cold in the shade). It might also rain! Or hail! I bring a small duffel bag of a bunch of different layers, including:

  • Winter-weight leggings
  • Beanie
  • Gloves
  • Winter coat (doubles as a rain jacket)
  • Fleece jacket or pullover
  • Shorts
  • T-shirt
  • Light-weight long sleeve shirt
  • Baseball hat and sunglasses

My winter coat unzips into two layers, which helps me save space. I kept the outer shell with me all day as a windbreaker or raincoat, and swapped out other layers in my backpack as needed. Just make sure you have something warm and a raincoat!

I wear running shoes all day. It can be nice to change socks halfway through the day as a little pick-me-up, so I usually bring a few pairs. You’ll need warm clothes for the start and for once it gets dark. Make sure to bring your own headlamp and, if you have them, lanterns for your car for crewing in the dark. This lantern from Black Diamond is my favorite.

What’s it like to crew for Leadville?

You will walk a lot. Every runner has at least one car following them, meaning there are at least 800+ vehicles attempting to meet a runner throughout the day. As people drop out or get cut off, this obviously goes down. Cars also get more spread out throughout the evening as the runners get more spread out, but for the first half of the race, be ready to park far away (potentially 1-2 miles) from the aid station and walk there.

In 2019, I walked more than seven miles. I didn’t even go to all the aid stations, and I was actually trying to limit my walking for the day! (I was preggo and had pubis symphysis disorder).

You’re going to be very tired. It’s a very long weekend emotionally, so even if you’re not running, you’ll be headed to bed at 7 pm on Sunday. You need to make sure you get some sleep before then though. You can’t support your runner well if you’re also completely frazzled.

Trying to catch some z’s …what a view to sleep through!

You can split the day into two semi-reasonable shifts if you skip a few aid stations. You can either have multiple members of your crew to make sure all the aid stations are covered, or discuss with your runner which ones they would be okay with you skipping (particularly if they’ll have a pacer with them).

Most of all, it’s going to be an experience like nothing else. The trail running community is awesome. There is a sense of camaraderie that I haven’t experienced anywhere else, that maybe can only be forged when you’re running 100 miles through the woods (or helping someone do so). Leadville is a world-famous race, but the competition is far from cut throat and everyone is out there to help each other and have as much fun as they can. You’ll be tired, you’ll be inspired, you might cry at the finish line.

It’s a really cool experience that anyone can be a part of – so don’t hesitate to join in if you get the chance!

What does your typical weekend look like?

The race starts at 4am Saturday, and if all goes well your runner will finish sometime Sunday between midnight and 10am.

This was how I did it in 2019 with my husband and our friend (both pacers, but helped me out as crew when they weren’t running). For reference, this was our year three crewing/pacing and I thought we did the best job logistically this time!

We stayed together all day except when one of them was pacing. You could cover more aid stations if you split up more than we did. Our runner prioritized nighttime pacing and morale boosts, so we prioritized those aid stations. As always, talk to your runner about their own preferences.

  • We woke up at 3:30 am to go to the start line with our runner. We went immediately back to the house and went back to sleep afterward, so we were back in bed by 4:30 am or so. We skipped May Queen because the crew can’t do much for you there when you’re not far into the race. It’s more of a morale boost. This is a point where you could split up if it was really important to your runner to see someone at every aid station.
  • Arrive at Outward Bound to really start the day (8:30 am for my runner). Be prepared to be out until after lunch time.
  • Next you have the option to meet your runner at Treeline (unofficial crew station along the road), or go straight to Twin Lakes. We went straight to Twin Lakes because we were worried about parking being a nightmare (it was). There’s a food truck at Twin Lakes and a general store if you need to buy anything. Both accept credit cards, but. thelines can get crazy so have a back-up plan!
  • In 2019, we skipped Winfield because of the shuttle fiasco and because our runner didn’t want a pacer until she came back through Twin Lakes. As of 2021, Winfield wasn’t an option for crew or pacers anymore.


We went home, ate, slept, and got ready for the night shift. This was at approximately 12:30pm for us. We didn’t need to leave for Twin Lakes until 4:30pm.

  • Arrive back at Twin Lakes. We weren’t going home again until 11pm or later, so both pacers brought all of their running stuff with them. Your runner’s needs at every aid station vary, but at this point, your runner will be wet and it’ll be dark or getting dark, so a change of clothes and a fresh headlamp is a must for this aid station.
  • Meet runner and pacer at Treeline for a quick morale boost. This is usually your biggest break because Twin Lakes and Treeline are about 20 minutes apart driving but takes several hours to run. This is a great time to sleep in your car because you just park right next to the road your runner comes down. Our runner got into Treeline at 10pm.
  • Go directly to Outward Bound, switch pacers, and go home to sleep (this was around 11:30pm for us).
  • We left May Queen to the overnight pacer because we wanted to wake back up at 3:30am to see our other friend finish and we knew we wouldn’t be able to do both. But, we kept our phones on loud in case anything went awry. As of 2023, a shuttle is now required for May Queen. Unfortunately as of Aug 2, the race still hasn’t updated any information about what to expect for the shuttle.
  • Wake up and meet your runner at the finish line! We did this twice to see both friends. If you only have one runner finishing, you could add on May Queen overnight and not feel TOO horrific if you’ve gotten a nap earlier in the day/evening.

Have other Leadville questions? Book a 30-minute consultation with me for just $15.

Published by Laura Cardon

Laura Cardon moved to Colorado as an adult and quickly realized how difficult it was to get started exploring the outdoors in a state full of experts. She founded Outdoor Beginner in 2014 to fill the gap in beginner-friendly content for camping, hiking, skiing, and other outdoor activities. In addition to Outdoor Beginner, she coaches beginner trail runners and works at Runners Roost in Golden, Colorado, where she lives with her spouse and toddler.

9 thoughts on “What’s it like to pace or crew the Leadville 100 Ultramarathon?

  1. Hi Laura I’d like to have a call with you.I am crewing for a friend this year 2023. How do I get a hold of you?

  2. This write-up is extremely helpful as I think through whether I have what it takes to crew and pace my friend this summer. THANK YOU for taking the time to share your experience with the rest of us newbies!

    1. I’m so glad to hear that!! Happy to answer any other questions that pop up. I thought I would really be missing out on the whole experience when I couldn’t pace in 2019 (I was too preggo) but I actually really loved being crew captain. I don’t do *great* with sleep deprivation so it was nice to have just one role. Good luck this summer!!

  3. This story is near and dear to my heart. My husband, myself, and another good friend paced & crewed the Leadville for another good friend. I thought we would have tons of time to hang out, enjoy the experience, etc. OMG we were on the go for the entire 29 hours it took her to finish. Crewing we were driving from place to place, getting things ready, packing em back up, driving to the next place. Once we started pacing you couldn’t sleep because we didn’t want to miss our sections. It was a lot of time but it was still a really cool experience. Cheers! Nice post.

  4. Yay! Another great OB – very thorough and completely described all aspects of this demanding race.

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