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⏵ Course guide · Grassroots Maine ultra

Little Duck 50K Course Guide

Little Duck 50K is five loops of technical New England singletrack at East Windham Conservation Area, and it is built around a rule most ultras do not have: no runner left behind. There is a 3 PM course close, but organizers stay for the last finisher, and whatever distance you complete gets recorded as a real result, not a DNF. I will walk you through the loop course first, then give you a pacing and fueling plan for repeated climbing, plus what that finishing culture actually means for how you should run your day. There are free calculators along the way to dial in your own numbers.

⏵ At a glance

Little Duck 50K quick facts

Date
Early October, a Sunday (exact date moves year to year, confirm on UltraSignup)
Location
East Windham Conservation Area, Windham, Maine
Distances
10K, 20K, 30K, 40K, and 50K, all built from the same 6.5-mile loop (1 to 5 loops)
Elevation gain
About 900 ft per 6.5-mile loop (organizer estimate); 50K works out to roughly 4,500 ft over 5 loops
Start time
7:00 AM
Cutoff
3:00 PM course close, but a "no runner left behind" policy: organizers stay for the last finisher and whatever loops you complete count as a real result, not a DNF
Entry style
UltraSignup registration, grassroots race, cotton finisher tee

These facts come from the official race registration page. Check the current year date, cutoff policy, and aid stations before you commit. Race logistics change year to year.

The course: five loops, one honest measure of you

Every distance at Little Duck, from the 10K up to the 50K, is built from the same 6.5-mile loop on the Purple, Red, and Blue trails at East Windham Conservation Area. The 50K is five laps of it. Nothing about the format hides how you are doing: you pass the start-finish, and aid, on a predictable rhythm all day.

Technical New England singletrack, five times over

The trails are wooded singletrack with the roots and uneven footing typical of Maine trail systems, and the organizers estimate about 900 feet of climbing per 6.5-mile loop. That is not a huge number on paper, but stack five loops together and you are looking at roughly 4,500 feet of real climbing by the time you are done, all on technical ground that gets more familiar and more tiring at the same time.

Two aid stations per loop keep the gaps short, snacks, water, and electrolyte drinks, so you are never far from support. Use that closeness to your advantage: this is not a course where you need to carry a full pack of contingency supplies.

The loop format rewards honest pacing

Because you repeat the same 6.5 miles five times, Little Duck punishes a fast first loop just like any repeated-loop course does. But it also gives you something valuable: a live readout of how your day is going, loop by loop, aid station by aid station. Use your splits honestly. If loop three is slower than loop one, that is real information, not a fluke.

No runner left behind: the defining feature of this race

Here is the part that makes Little Duck different from almost every other ultra: the official course close is 3 PM, eight hours after the 7 AM start, but the organizers stay out there until the last runner finishes, whatever loop they are on. There is no DNF at this race. If your 50K attempt ends after three loops, you get recorded as a 30K finisher, a real result for a real distance covered, not a mark against you.

That changes how you should think about a hard day. You do not have to choose between a heroic, risky push to save a 50K label and a walk to the car. You can run your best honest effort, stop when you need to, and still walk away with something true about what you did that day. It is a grassroots race built by people who clearly understand what a hard ultra actually asks of a body, and it treats finishers accordingly.

Pacing strategy for a repeated technical loop

With no hard DNF hanging over you, you can actually run Little Duck the right way: even effort across five loops, adjusted honestly if the day is not going as planned.

Pace loop one like you have four more to run

The 900 feet of gain per loop is real, technical climbing, not flat road pace. Use a grade-adjusted pace target to hold a steady effort on the climbs instead of matching your flat training pace, and resist running loop one fast just because the legs feel fresh and the trail feels familiar. You will run this exact loop four more times.

Use your own splits as your finish prediction

A vert-aware finish prediction built off your actual loop-one and loop-two splits is more honest here than a flat-course guess, since the repeated climbing compounds in ways that are hard to estimate blind. Check that projection against the 3 PM close, and remember that Little Duck’s cutoff culture means a slower-than-planned day still ends in a real result, so pace for a good effort, not a fear of failure.

⏵ Free tools to pace this course

Fueling strategy for a frequent-aid loop course

Most 50K finishers land somewhere in the 6 to 8 hour range, with two aid stations per loop keeping the gaps short. Use that frequency to your advantage instead of overcomplicating your fueling.

Carbs: light and often, thanks to the aid spacing

Aim for roughly 60 to 90 grams of carbohydrate per hour. With two aid stations per 6.5-mile loop, you do not need to carry a heavy reserve, just a steady rhythm of snacks and electrolyte drinks between stops. Practice this exact fuel-light-and-often approach on a training run before race day so it feels automatic by loop three.

Sodium: typical early-October New England numbers

Sodium in the 300 to 500 mg per liter range covers most runners for a cool early-October day in southern Maine, pushed higher if the forecast runs warm or you know you sweat heavily. The electrolyte drinks on course help, but do not assume they alone cover your full sodium needs across five loops.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and typical Windham conditions 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 five-loop Little Duck course profile, and your projected splits. Summit Line reads your real training, builds a plan for repeated technical climbing, and rehearses your fueling so race day is something you execute, not guess at.

Start free →Explore the demo

Little Duck 50K FAQ

How hard is the Little Duck 50K?

Little Duck 50K is five loops of a 6.5-mile course through wooded New England singletrack at East Windham Conservation Area, with roughly 900 feet of climbing per loop by the organizers’ own estimate, working out to somewhere around 4,500 feet over the full 50K. That is real, honest climbing on rooty, technical trail, repeated five times. What sets Little Duck apart is not the difficulty, though, it is the culture: this is a "no runner left behind" race. There is a 3 PM course close, but organizers stay until the last finisher comes in, and if you only complete three of the five loops, you get a real 30K result, not a DNF.

How much climbing is in the Little Duck 50K?

Each 6.5-mile loop carries an organizer-estimated 900 feet of gain, and the 50K stacks five of those loops, so total climbing lands somewhere around 4,500 feet. That is an extrapolation from the per-loop number, not an official surveyed total, but it gives you a real sense of what you are in for: repeated, honest climbing on technical New England singletrack, not one big mountain.

How should I fuel for the Little Duck 50K?

A 7 AM start on a 6.5-mile loop course puts most 50K finishers somewhere in the 6 to 8 hour range, with two aid stations per loop offering snacks, water, and electrolyte drinks. Aim for roughly 60 to 90 grams of carbohydrate per hour and sodium in the 300 to 500 mg per liter range for typical early-October New England weather, adjusting up if the day runs warm. With aid every 3ish miles, you can fuel light and often instead of carrying a full race’s worth of calories. Build your exact numbers with the free ultra fueling calculator.

What are the cutoff times for the Little Duck 50K?

The published course close is 3 PM, eight hours after the 7 AM start. But Little Duck runs on a "no runner left behind" policy: organizers stay out there for the last finisher, and the race does not use DNF as a category the way most ultras do. If you complete three of the five loops before you stop, that is recorded as a real 30K finish, not a failure to finish the 50K. It is one of the more forgiving cutoff cultures in ultrarunning, built around finishing something honest rather than hitting an arbitrary number.

What is the terrain like at Little Duck 50K?

The course runs on the Purple, Red, and Blue trails at East Windham Conservation Area, wooded New England singletrack with the roots, rocks, and uneven footing that comes with it. It is a five-loop format, so you pass the start-finish area, and two aid stations per loop, on a predictable rhythm. Nothing about the terrain is extreme, but repeated technical singletrack across five loops adds up, and late footing on the final loop will feel different than it did on loop one.

Is the Little Duck 50K a good first 50K?

Honestly, yes, and for a specific reason: the "no runner left behind" culture takes the fear out of a first ultra. If you go out for the 50K and your day falls apart after three loops, you walk away with a real 30K result instead of a DNF on your record. That safety net, combined with a loop format that puts you back at aid every 6.5 miles, makes Little Duck one of the more approachable ways to try a 50K distance for the first time. The climbing is real, so still train the vert, but the race itself is built to meet you where you are on the day.

This guide is independent and for planning only. The course details, dates, and cutoff policy 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.