⏵ Course guide · Indiana timed lake-country race
Glacial Esker is a timed race at Chain O'Lakes State Park in Albion, Indiana, choose a 6, 12, or 24 hour window and cover as many loops of rolling pastures, technical trail, and steep climbs as you can. I will walk you through the timed format and terrain first, then give you a pacing and fueling plan built around your chosen window, plus free tools to dial in your own numbers.
These facts come from the official Ignite Trail Series homepage. Loop length, aid, and vert are covered in the event's own Participants Guide, confirm the current details there before you register or run.
Glacial Esker runs as a timed race rather than a fixed-distance event, with 6-Hour, 12-Hour, and 24-Hour options on repeated loops through Chain O'Lakes State Park.
Unlike a fixed-mile ultra, your total distance at Glacial Esker emerges from how consistently you move within your chosen time window. That shifts the mental game: instead of counting down remaining miles, you are managing remaining time and effort, a different discipline that some runners find liberating and others find harder to pace.
Glacial Esker shares its venue with the fall Indiana Trail 100, and the Ignite Trail Series describes the park as scenic lake-country running, rolling grass pastures, technical trail, and steep climbs, with views of the park's lakes throughout. Expect a real trail test, not a flat, easy loop course.
If you are eyeing the Indiana Trail 100 in the fall, Glacial Esker on the same course in the spring gives you a lower-commitment way to experience the terrain firsthand, especially at the 6-hour option, before deciding whether to take on the full fall event.
With no finish-line distance to chase, sustainable, repeatable effort across your whole window matters more than any single fast lap.
A grade-adjusted pace target for the rolling, technical terrain gives you a realistic per-loop time. In a timed race, a too-fast early loop does not just risk blowing up, it also throws off your mental math for how many total loops your remaining time allows.
After your first two or three loops, you will have a real sense of your sustainable per-loop time. Use that to estimate your realistic total loop count for your chosen window, and adjust your effort up or down from there rather than guessing blind for the full 6, 12, or 24 hours.
⏵ Free tools to pace this course
A loop-based, timed format gives you a real logistical advantage: frequent, predictable access to your own supplies at the start/finish every lap.
Aim for roughly 60 to 90 grams of carbohydrate per hour, and use the repeated access to the start/finish area to restock exactly what you need each loop, rather than carrying large reserves for an entire 12 or 24 hour window.
Keep sodium in the 300 to 700 mg per liter range, and if you are running the 24-hour option, plan for a real temperature swing across a late-April day and night in Indiana, warm afternoons giving way to cold overnight hours.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal window, and a late-April day at Chain O'Lakes 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, your chosen time window, and your projected loop splits. Summit Line reads your real training, builds a plan for rolling lake-country terrain, and rehearses your fueling so race day is something you execute, not guess at.
Glacial Esker is a timed race, not a fixed-distance one: you choose a 6-Hour, 12-Hour, or 24-Hour window and cover as many loops as you can within it. That format rewards steady, sustainable pacing over the full time window rather than racing toward a predetermined finish line, and it means your total distance is entirely a function of how consistently you can move.
The Ignite Trail Series describes Chain O'Lakes State Park as scenic lake-country running, a mix of rolling grass pastures, technical trail, and steep climbs, with views of the park's many lakes throughout. This is the same venue used for the fall Indiana Trail 100, so expect a genuine trail challenge rather than flat, easy loops, even though the overall event structure (timed, not fixed distance) is more forgiving of an off day.
The timed format itself is approachable, you decide your own distance by how long you choose to run, but the terrain underneath, rolling pastures, technical trail, and steep climbs, is a real trail challenge. Treat your chosen window (6, 12, or 24 hours) as the actual goal, and let your total mileage be a result of sustainable pacing on genuinely varied terrain rather than a number you chase directly.
Because you control your own loop count and effort, plan your fueling around your chosen time window rather than a fixed mile count. Aim for roughly 60 to 90 grams of carbohydrate per hour and sodium in the 300 to 700 mg per liter range, and use the repeated-loop format to your advantage, restocking food and hydration at a predictable point every lap rather than carrying large reserves. Build your numbers with the free ultra fueling calculator before race day, and confirm the current aid station and loop-length details with the official Glacial Esker Participants Guide.
Yes, the loop format at a fixed venue gives you frequent access to the start/finish area, useful for a first timed event's logistics, drop bags, crew, and mental math. Choosing the 6-hour option is a reasonable entry point if you want to try the timed-race format without committing to a full 24-hour effort, while still experiencing Chain O'Lakes' genuinely varied lake-country terrain.
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<a href="https://runsummitline.com/guides/glacial-esker">The Glacial Esker course guide</a><iframe src="https://runsummitline.com/embed/race/glacial-esker" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Glacial Esker course guide by Summit Line"></iframe>This guide is independent and for planning only. The course details, dates, cutoffs, and aid stations 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.