⏵ Course guide · Santa Fe classic
The Big T sends its field up the Aspen Vista Trail from about 10,000 feet to nearly 12,000 feet at the summit of Tesuque Peak, about 2,000 feet of climbing in 5.8 miles, then straight back down for a 12-mile round trip. A Santa Fe tradition since 1985. I will walk you through the climb and the logistics first, then give you a pacing and fueling plan sized to a single sustained out-and-back, plus free tools to dial in your own numbers.
These facts come from the official race registration page. Start times, aid station details, and logistics can change year to year, so confirm the current specifics before you commit.
There is only one route here: up FS-150, a closed dirt-and-rock road, from the Aspen Vista trailhead to the radio towers atop Tesuque Peak, then back the way you came. Simple on paper, sustained in practice.
The climb gains roughly 2,000 feet over 5.8 miles at a grade the race itself describes as nearly constant, with only a few short flat patches and a few steeper pitches breaking up the rhythm. Starting elevation sits around 10,000 feet, and the summit lands close to 12,000 feet, so you are asking your legs and your lungs to work the entire way up, not just on isolated pitches.
You will pass the first aid station around mile 3 on the way up and again around mile 9 on the way back down. The second aid station sits at the summit itself, where a course marshal calls out to runners at the turnaround, a metal fence pole with a bright pinata marks the actual point to go around. That summit aid station starts closing around 11:15 AM, which for the 9:00 AM main start gives you a little over 3 hours to reach the top, about a 2 mph walking pace. Treat that as the race's functional cutoff even though there is no separately stated overall time limit.
Bring your own bottle. Both the pre-race coffee and the on-course aid stations are cupless, with volunteers filling bottles from pitchers rather than handing out disposable cups. The race also asks everyone to self-seed at the start, faster runners up front, slower runners and walkers toward the back, because descending runners will be moving fast on a trail that climbing runners are still working their way up. Dogs are not allowed, both for safety on the narrow trail and out of consideration for runners at speed on the descent.
With a hard cutoff at the summit and a fast, technical descent waiting on the other side, the pacing question here is simple: climb conservatively enough to actually enjoy the way down.
A grade-adjusted pace target for the 5.8-mile climb gives you a realistic number to aim for on a nearly constant grade at altitude, which is a very different effort than a flat-ground pace at the same heart rate. If you are new to running above 10,000 feet, build in extra margin beyond what a grade-adjusted number alone suggests, since altitude slows almost everyone regardless of fitness level.
The descent is where a well-paced climb pays off. Runners who blow up on the way up either miss the summit cutoff or arrive at the turnaround with nothing left for a technical, fast descent back to Aspen Vista. Check a race-time prediction against the 11:15 AM summit aid closing time early in your climb, while you still have room to adjust effort rather than hope.
⏵ Free tools to pace this course
At 12 miles, this is not a race that demands a complex fueling plan, but the altitude still matters more than the distance suggests.
With only two aid stations on a 12-mile course, and both of them cupless, come with your own bottle filled and ready to top off. Cool mountain air can mask how much fluid you are actually losing at 10,000 to 12,000 feet, so drink on a schedule through the climb rather than waiting until you feel thirsty.
For most runners, a gel or two on the way up plus whatever the aid stations offer is enough for a race this length. The bigger lever is altitude tolerance, not fueling, so if you are traveling in from lower elevation, prioritize arriving a few days early and staying hydrated in the days before the race over any specific carbohydrate strategy on race day itself.
⏵ Build your fueling plan
Get a carb, sodium, and fluid plan built for your weight and a high-altitude climb 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 training plan built around YOUR fitness and this exact climb-to-Tesuque-Peak profile. Summit Line reads your real training, builds the sustained climbing strength this course demands, and rehearses your pacing so the summit cutoff is never a question on race day.
For a 12-mile race, it is a real climb: roughly 2,000 feet of gain packed into 5.8 miles on a closed dirt-and-rock road, starting around 10,000 feet of elevation and topping out near 12,000 feet at the radio towers on Tesuque Peak. The grade is described as nearly constant, so there is no real recovery on the way up, and the altitude alone will slow most runners who are not already living or training near 10,000 feet.
About 2,000 feet over 5.8 miles of ascent, then the same in reverse on the way back down, for a 12-mile round trip. The official course description calls the grade nearly constant, with only a few short flat patches and a few steeper pitches, so you are climbing more or less the entire outbound leg.
There is no separately published overall time limit, but the summit aid station starts closing around 11:15 AM, which functions as the race's real cutoff at the turnaround point. For the 9:00 AM main start, that gives a little over 3 hours to summit, roughly a 2 mph walking pace. If you think you will need more than 3 hours, the race offers an 8:00 AM early start specifically for that reason, so use it rather than risk missing the summit aid station.
A bottle or handheld, because this is a cupless race at both the pre-race coffee and the aid stations, where volunteers will fill your bottle from pitchers rather than handing out cups. Leave your dog at home, it is not allowed on course, both for safety and out of courtesy to other runners descending fast on the return leg.
The organizers treat self-seeding, faster runners toward the front, slower runners and walkers toward the back, as a real safety issue on a narrow out-and-back trail, since faster finishers will be descending at speed while slower runners are still climbing. If you expect to take 3 hours or more, the race recommends starting toward the back of the field, or better, taking the 8:00 AM early start instead.
It is a manageable, well-supported introduction to real elevation and sustained climbing without the commitment of an ultra: two aid stations, a defined turnaround, and an active local running community behind it since 1985. The main thing to respect is the altitude, starting at 10,000 feet and climbing to 12,000, which will humble runners coming from sea level regardless of fitness. Arrive a few days early if you can to acclimate, and take the early start if there is any doubt about your pace.
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<a href="https://runsummitline.com/guides/big-tesuque-trail-run">The The Big Tesuque Trail Run course guide</a><iframe src="https://runsummitline.com/embed/race/big-tesuque-trail-run" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="The Big Tesuque Trail Run course guide by Summit Line"></iframe>This guide is independent and for planning only. The course details, dates, cutoffs, and logistics 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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