⏵ Course guide · Houston-area timed charity ultra
The Snowdrop ULTRA sends solo runners and relay teams around a USATF-certified 0.69 mile loop at Buffalo Run Park in Missouri City, Texas, for 55 continuous hours spanning New Year's. There is no finish line pulling you forward, just the loop, the clock, and a cause: every lap benefits the Snowdrop Foundation's childhood cancer research and scholarships. I will walk you through the format and the race's origin first, then give you a pacing and fueling plan built for a timed multi-day loop, plus free tools to dial in your own numbers.
These facts come from the official Snowdrop Foundation ULTRA-55 page. Check the current year details, start time, and format before you commit. Race logistics change year to year.
Every runner, solo or relay, covers the same USATF-certified 0.69045 mile loop of crushed granite and pavement at Buffalo Run Park. There is no route to learn beyond your first lap: the entire race is what you do with the 55 hours you are given.
The number is not arbitrary. Snowdrop Foundation was inspired by Chelsey Campbell, a 15-year-old whose 2006 cancer surgery at Texas Children's Cancer Center lasted 27 continuous hours, with 2 surgeons working in shifts. The race's name does the math directly: 2 surgeons times 27 hours equals 54, plus 1 more hour for Chelsey, for 55. Every lap you run is tied to that story, and to the foundation's ongoing work funding childhood cancer research and college scholarships.
Solo Division finishers earn a buckle at 100, 150, 200, and 250 miles, tiered goals that give you something concrete to chase whether this is your first 100 or your fifth 250. Relay teams of up to 10 runners split the same 55 hours however they choose, and new for 2026 the race awards the top three relay teams by total team mileage instead of only the winning team, so building a squad with steady overnight coverage now has more to play for.
At 0.69045 miles per lap, you pass your own gear, food, and support roughly every 8 to 12 minutes depending on pace. That is the defining advantage of this format: you can stage layers for the cold nights, real food instead of just gels, and fresh socks, and the course brings you back to all of it constantly. Use that access instead of trying to carry a 55 hour race on your back.
With no course to conquer and no checkpoint to miss, the entire race comes down to how little you slow down over 55 hours, and how well you plan your sleep.
A short, flat, certified loop makes it easy to run faster than you should in the first hours, and that is exactly the trap. Settle into a pace you could describe as boring, because the runner who slows the least over 55 hours covers the most distance, not the one who banks fast early laps and pays for them later. Use a race-time calculator to translate your fitness into a sustainable hourly distance for a multi-day event before you commit to a lap pace.
In a 55 hour race, when and how long you rest is as important as how fast you run. Short, purposeful stops for fuel and foot care beat long sit-downs that get harder to leave, especially overnight. Decide your stop and sleep rules before the race starts, so a tired brain hours in does not get to renegotiate them. Break the event into laps and hours instead of a single overwhelming distance target, and let the loop itself function as your checkpoint every single time you pass the start.
⏵ Free tools to pace this race
Late December in the Houston area can swing from mild afternoons to genuinely cold nights, and with 55 hours to cover, your fueling has to hold up across at least two full day-night cycles.
Aim for roughly 60 to 90 grams of carbohydrate per hour while moving. The short loop means you can mix gels and drink mix with real food from your own crew table every few minutes, so use that access to keep eating on a schedule rather than waiting until you feel empty. Warm food and hot drinks are especially valuable through the overnight hours when appetite for sweet gels tends to fade.
Sodium in the 300 to 700 mg per liter range covers most runners, leaning higher through any warm daytime stretches and lower as temperatures drop overnight. Because Buffalo Run Park sits in the Houston metro, late-December and New Year's conditions can still turn humid during the day even as nights get cold, so check the forecast close to race week and adjust rather than assuming one fixed number for the full 55 hours.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal distance, and a multi-day Houston-area December with the free ultra fueling calculator. Browse the rest of the free running tools at the tools hub.
⏵ Train for it with Summit Line
Get a race-day plan built around YOUR fitness, this exact 55 hour loop format, and your projected mileage. Summit Line reads your real training, builds a plan for sustained multi-day pacing, and rehearses your fueling so race day is something you execute, not guess at.
There is no technical terrain to worry about: the course is a USATF-certified 0.69045 mile loop of crushed granite and pavement at Buffalo Run Park. The difficulty is entirely about time on feet across 55 continuous hours, managing sleep, fueling, and repetition rather than climbing or footing. Solo runners chasing a buckle at 100, 150, 200, or 250 miles are managing a genuine multi-day effort, while relay teams of up to 10 can split the load and keep the pace high across the same window.
The official race page does not publish an elevation gain figure for the loop. The course is described only as crushed granite and pavement at Buffalo Run Park, a Houston-area park course rather than a mountain or hilly trail, so plan around a low-vert, repetition-driven effort rather than a climbing challenge.
A short certified loop is one of the most fuelable formats in ultrarunning, since your own crew table or drop area comes back around every 0.69 miles. Aim for roughly 60 to 90 grams of carbohydrate per hour while moving, and sodium in the 300 to 700 mg per liter range, adjusting for the late-December to early-January Houston weather, which can swing from mild days to cold nights across a 55 hour window. Graze on a schedule rather than waiting until you feel empty, and use the frequent loop access to bring in warm food and drinks overnight. Build your own numbers with the free ultra fueling calculator before race day.
The time limit is the entire point of the race: 55 continuous hours, from Wednesday, December 30, 2026 through Friday, January 1, 2027. There is no separate cutoff to chase inside that window. Solo runners and relay teams simply cover as much distance as they can before the 55 hours run out, so the real planning question is how much you can sustain, and how much you sleep, not whether you will make a checkpoint in time.
Relay teams of up to 10 runners share the same 0.69045 mile certified loop across the full 55 hours, rotating runners however the team decides. New for 2026, the race awards the top three relay teams by total team mileage, rather than just the winning team as in past years, so building a squad with steady overnight coverage is worth real placement, not just finishing.
The short, flat, certified loop with constant access to your own crew area and aid makes this one of the more approachable formats for a first timed event, especially as part of a relay team where you can split the 55 hours with up to nine other runners. For a first solo attempt, the buckle tiers at 100, 150, 200, and 250 miles give you a range of realistic goals rather than an all-or-nothing target, and the race benefits the Snowdrop Foundation's childhood cancer research and scholarship mission, which is a strong reason to show up even if your finishing distance is modest.
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<a href="https://runsummitline.com/guides/snowdrop-ultra-55">The Snowdrop ULTRA 55 Hour Race course guide</a><iframe src="https://runsummitline.com/embed/race/snowdrop-ultra-55" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Snowdrop ULTRA 55 Hour Race course guide by Summit Line"></iframe>This guide is independent and for planning only. The course details, dates, format, and awards come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The fueling and pacing advice is general and not medical advice.
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