Thinking about running your first 100-mile race but not feeling confident?
Find a pacer to make it a little easier and a lot more fun!
Running 100 miles is tough, but you don’t have to do it alone. A pacer can keep you motivated, on track, and moving forward when things get tough.
Connect with experienced runners who can guide you through the highs and lows of your race!
Become a Pacer
Having completed a 100-mile (or two), you know what it takes.
Help fellow runners achieve their goals by pacing or crewing!
Pacing is more than just running alongside—it's about motivation, strategy, and support.
Share your experience, help others push through the tough miles, and be part of their success story!
Connect with Runners
Looking for a few fellas to be part of your next big trail adventure out there?
Share your event and connect with other runners to make it happen.
Running is better together!
Find training partners, crew members, or pacers for your next big race.
Share your plans, connect with like-minded runners, and turn solo adventures into unforgettable experiences.
Run Square is all about bringing runners together!
Whether it’s pacing, crewing,
offering a place to stay, sharing tips, helping with transportation, or providing moral support, there’s
always a way to lend a hand.
This is your place to connect and make a real difference in a
runner’s journey.
Inspired to join the Run Square community? See how it works and get ready to connect!
See Run Square in Action
Check out these screenshots to see how Run Square helps runners connect and achieve their goals.
Ready to take your running to the next level? Download Run Square today and start your journey!
From the Blog
Check out our latest articles below, and visit our blog for even more.
Check out these top picks for your next running challenge.
Moab 240
Fri, Oct 9, 2026 • Moab, UT
Enjoy 240 miles of beautiful terrain as you travel through desert, canyons, slick rock, and two mountain ranges — all while surrounded by Canyonlands and Arches National Park.
We encourage friends, family, and the running community to get involved in the run by pacing.
Pacers are for runner safety and company only, not for giving aid or to gain an advantage over another runner.
Pacing starts at the Indian Creek Aid Station. Pacers are only allowed to be picked up or dropped off at crew access aid stations.
100 Mile, 100K, 50K, 25K and 10(+) Mile Race
Join us for the Pumpkin Holler Hunnered race on October 18th & 19th. You will agree we have found a little slice of heaven in Cherokee County, nestled along the beautiful Illinois River.
Pacers will be allowed for all 100 mile and 100K runners AFTER the first 50K loop is completed.
Each runner may have as many pacers as they like, however only one pacer at a time can accompany the runner.
Javelina Jundred is the original costumed 100 mile trail run party. Join the party Jalloween weekend! The race is held on a ~20 mile rolling single track trail course comprised mostly of the Pemberton Trail in beautiful McDowell Mountain Regional Park near Fountain Hills, Arizona. Join us for the ultimate social 100 mile trail run!
Multiple pacers may be used, but only one at a time. Pacers must be human and on foot (no pets and no bicycles allowed). Pacers can only be picked up and dropped off at Javelina Jeadquarters, therefore, all pacers should be prepared to complete the full 20-mile loop; no exceptions. No muling or carrying of a participant’s gear or supplies.
Javelina Hundred
Rio Del Lago 100 Miler begins at beautiful Beal’s Point, Folsom Lake State Recreation Area in the Sierra-Nevada Foothills. With Folsom Lake as the sparkling back drop, you’ll traverse oak woodland and meadows, over bridges and creeks, up and down switchbacks and along the most spectacular trails in the area. This scenic 100-mile foot race combines two of The Best trail races in Northern California: American River 50 and Way Too Cool 50K. The 100-mile course includes a variety of terrains that novice and veteran runners alike will enjoy.
Pacers can ONLY join a runner at the Overlook on the outbound (mile 45.22), Cool Fire Station (mile 69.13) on the inbound/return, the Overlook on the inbound/return (mile 76.83) and also at Rattlesnake Bar (mile 86.01).
You may have more than one pacer to help you get to the finish line, but runners may be accompanied by no more than one pacer at a time.
Pacers can only be on foot.
Way Too Haught 105k – Highline Trail Endurance Run
Sat, Nov 7, 2026 • Pine, AZ
Way Too Haught 105k will take you from point to point throughout the scenic Highline Trail. Be well prepared, as this race is run on rugged and technical terrain and can be exposed throughout the day.
The course may be marked at critical junctions, but participants will be required to download the GPX coordinates on their watch or smart phone.
The race takes place in early November, where temperature can be in the high 80s to a low of 30 degrees with possible rain or snow.
Start time will be 6:00 a.m. and a head lamp will be needed for the start.
This event is limited to 50 runners and crew, and pacers are allowed ONLY at the designated aid stations shown on the course map.
A tour of the Phoenix Mountains Preserve, this challenging 50k course will take you up iconic Piestewa Peak and Shaw Butte and along Sonoran Desert single track in the heart of Phoenix, AZ. Be prepared for 6,000' of elevation gain and some serious PHOMO for all who miss out.
There will be water fountain and restrooms at these major trailheads: 40th St Trailhead, Dreamy Draw Trailhead, North Mountain Visitor Center and Piestewa Peak Dr.
You are allowed crew access at the trailhead listed above and PACERS are allowed starting from the first time through Dreamy Draw.
Sat, Feb 13, 2027 • Spring Valley to New River, AZ
The Black Canyon Ultras feature point-to-point 100K & 50K courses along the world-class Black Canyon National Recreation Trail. Join us in February for this classic Arizona foot race.
Pacers are permitted to start with their runner at the Deep Canyon Ranch aid station (mile 31.9). Pacers must be human and on foot. Only one pacer is allowed at a time, but pacers may switch out at the Table Mesa Aid Station (Mile 50.9). Pacers are only permitted for the 100K.
One of the Oldest Trail Ultramarathons in Arizona.
50 Mile runners aged 60 years or older are allowed a pacer on the second loop. Pacers must inform race management and begin their pacing duties at Kentucky Camp.
The Arizona Monster is a 309 mile point to point journey through Southern Arizona's Sonoran desert. The Sonoran desert is unique, in that it has subtropical warmth in winter and two seasons of rainfall. This creates an extreme contrast between aridity and moisture supporting diverse and vibrant flora and fauna. The route is rugged, challenging, and features some of Southern Arizona's most iconic backcountry terrain and high elevation mountains.
Ozark Foothills Endurance Runs - Hosted each spring in Greensfelder County Park in Wildwood, Mo., this race offers 100 Mile, 100K, 50 Mile, 50K, Night-50K, Marathon, 25K and 25K RUCK distance options and is a looped course that utilizes some of the region's top-rated trails. Come run the scenic and technical terrain laying at the foothills of the gently rolling Ozark Mountain range. More than 90 percent single-track. We are proud to be a USATF Regional Association Championship race!