⏵ Course guide · Indiana fall trail festival
The Tecumseh Trail Marathon, now run as the DINO Tecumseh Trail Challenge Festival, sends five distances through Yellowwood State Forest singletrack near Nashville, Indiana, in its 24th year. I will walk you through the course and the staggered starts first, then give you a pacing and fueling plan built for a sparsely aided fall trail race, plus free tools to dial in your own numbers.
These facts come from the official DINO Series race page. Check the current year details, cutoffs, and registration window before you commit. Race logistics change year to year.
All five distances start and finish at the Yellowwood Group Camp on Yellowwood Lake, sharing the same forested singletrack that touches the 42-mile Tecumseh Hiking Trail.
For 2026, the organizers redesigned the course around a railroad closure that affected the historic route, describing the new layout as more nostalgic and true to the race's original "Tecumseh Trail Challenge" name. Expect rolling, forested Indiana singletrack through Yellowwood State Forest during peak autumn color.
The 50K solo race starts at 8:00 AM, the Marathon at 8:15 AM, the Half Marathon at 8:30 AM, and both the 50K Relay and the 8 Mile at 9:00 AM. Every distance shares the same 6:30 PM finish cutoff, so the earlier starts give the longer distances the extra hours they need.
There are only 2 total aid stations on course. Drop bags are allowed for 50K and Marathon runners only, and 50K runners will pass the Dam Aid Station twice over the course of the race. Plan your gear and fueling with that spacing in mind, since this is not a densely aided race.
Because every distance finishes by 6:30 PM regardless of start time, your real time budget depends on which race you are running.
The 50K gets roughly 10.5 hours from its 8:00 AM start to the shared 6:30 PM cutoff, the Marathon gets a bit over 10 hours, and the Half Marathon, Relay, and 8 Mile get closer to 9.5 to 10 hours. A grade-adjusted pace target for Yellowwood's rolling singletrack, checked against your specific distance's real window, is more useful than the single 6:30 PM cutoff alone.
DINO Series and Indiana Trail Running run free organized training days on the course in the weeks before the race. If this is your first Tecumseh, using one of those sessions to learn the redesigned 2026 route beats guessing at pacing on unfamiliar singletrack.
⏵ Free tools to pace this course
With only 2 total aid stations, your own fueling plan matters more here than at a race with continuous support.
Aim for roughly 40 to 70 grams of carbohydrate per hour if you are running the 50K or Marathon. Since drop bags are only allowed for those two distances, and 50K runners pass the Dam Aid Station twice, build your fueling plan around those specific touchpoints rather than assuming frequent aid.
An 8 to 9 AM October start in southern Indiana often begins cool and can warm through the day. Layer for the start and plan to shed clothing as the day goes on, especially if you are on the longer 50K or Marathon distances out for most of the daylight window.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a sparsely aided fall trail race 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 Yellowwood singletrack course profile, and your projected splits against your distance's real time window. Summit Line reads your real training and rehearses your fueling so race day is something you execute, not guess at.
The organizers themselves describe the terrain as "demanding, challenging, yet beautifully rewarding," running on singletrack through Yellowwood State Forest that touches the 42-mile Tecumseh Hiking Trail. For 2026, the course was redesigned around a railroad closure, described as more nostalgic, true to the race's roots as the "Tecumseh Trail Challenge." It is a genuine trail test on rolling, forested Indiana terrain, in its 24th year of testing runners each fall.
Five options, each with its own staggered start: a 50K solo race at 8:00 AM, a 26.2-mile Marathon at 8:15 AM, a 13.1-mile Half Marathon at 8:30 AM, and both a 2-to-4-person 50K Relay and an 8 Mile race at 9:00 AM. All five share the same 6:30 PM finish cutoff, so the earlier starts on the longer distances build in the extra time those runners need.
There are only 2 total aid stations on course, with drop bags allowed for 50K and Marathon runners only, and 50K runners passing the Dam Aid Station twice. Aim for roughly 40 to 70 grams of carbohydrate per hour on the 50K or Marathon, and plan your drop bag contents carefully since aid is sparser here than on a fully stocked ultra course.
All five distances share a single 6:30 PM finish cutoff, regardless of start time. Because the 50K starts at 8:00 AM and the shorter 8 Mile and Relay start at 9:00 AM, the effective time window differs by distance: roughly 10.5 hours for the 50K, just over 10 hours for the Marathon, and about 9.5 hours for the shorter options.
Expect rolling, forested Indiana singletrack through Yellowwood State Forest, redesigned for 2026 around a railroad closure and touching the 42-mile Tecumseh Hiking Trail. The race runs during peak autumn color, and the organizers, DINO Series and Indiana Trail Running, hold free training runs and trail-maintenance days on the course in the weeks before race day for anyone who wants to learn the terrain first.
The 50K is a reasonable first-ultra distance if you have some trail experience, especially with the option to learn the course on one of the free organized training runs beforehand. If a 50K feels like too much for a first attempt, the Half Marathon or 8 Mile options let you experience the same Yellowwood terrain at a shorter, more approachable distance before committing to the full 50K in a future year.
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<a href="https://runsummitline.com/guides/tecumseh-trail-marathon">The Tecumseh Trail Marathon course guide</a><iframe src="https://runsummitline.com/embed/race/tecumseh-trail-marathon" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Tecumseh Trail Marathon course guide by Summit Line"></iframe>This guide is independent and for planning only. The course details, dates, cutoffs, and registration windows 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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