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⏵ Course guide · Free

Firebird Trail Races Course Guide

Firebird Trail Races is a Grind Run Company event at Lowell Preserve near Windham, Maine, and regional press describes the footing as crushingly technical. The 50K is three 10-mile loops, all starting and finishing at the Windham Fire Station, so you know exactly what is coming by the second lap. I will walk you through the course, then give you a pacing and fueling plan built for technical ground you repeat three times, with free tools to dial in your own numbers.

⏵ At a glance

Firebird Trail Races quick facts

Date
Saturday, August 22, 2026
Location
Lowell Preserve, Windham, Maine (extends into North Falmouth Community Forest)
Distances
50K (marquee, three 10-mile loops), marathon, and 13 mile
Elevation gain
Not consistently published; regional press describes the course as crushingly technical
Start/finish
Windham Fire Station, all distances
50K cutoff
9 hours overall (about 17:42 per mile pace)
Entry style
Race fee plus a required donation to a nonprofit of the entrant's choice

These facts come from the official Grind Run Company race listing and UltraSignup. Check the current entry cost, cutoffs, and aid stations in the race-day details before you commit. Race logistics change year to year.

The course: three loops of technical New England singletrack

The 50K is three 10-mile loops through Lowell Preserve, extending into North Falmouth Community Forest, with every loop starting and finishing at the Windham Fire Station. The terrain is technical enough that regional press has called it crushingly hard, and running it three times means the footing never gets easier, only more tiring to navigate.

Loop one: learn the ground while your legs are fresh

Use the first loop to actually learn the technical sections, the root tangles, the rock gardens, the spots where the trail narrows and demands full attention. This is the heart of the race. Your legs are fresh, so this is the cheapest lap to move carefully on and file away what is coming.

Do not race lap one against an imagined split. There is no flat, easy stretch here to bank real time on, so treat the opening loop as reconnaissance for the two that follow.

Loop two: the technical footing starts to cost more

By the second loop you know the course, but your legs do not care that you know it. The same roots and rocks that were a minor nuisance on lap one start demanding more attention and more energy as fatigue sets in. Small mistakes, a rolled ankle, a stubbed toe, cost more here than they did fresh.

Stay deliberate with your foot placement even when you are tired of thinking about it. The runners who fade hardest on this course are usually the ones who stop paying attention to the ground once fatigue sets in.

Loop three: the cutoff pace exists for a reason

The 9-hour cutoff works out to about 17:42 per mile, a pace that sounds forgiving until you are three hours into technical singletrack that never lets you relax into a rhythm. The organizers set that number knowing this ground is slow, so respect it rather than assuming an easy buffer.

By the final loop you are navigating the same technical terrain on your most tired legs of the day. Patience through the rough sections, even late, beats trying to force a faster pace on ground that is not built for it.

Pacing strategy for crushingly technical terrain

A course this technical is not one you pace off a watch. Effort and footing decide your speed far more than fitness alone, so plan around that instead of a flat-ground pace chart.

Pace by effort and terrain, not a flat-trail number

On technical New England singletrack like this, your usual pace expectations mean very little. What matters is grade- and terrain-adjusted effort, holding a steady output through the roots and rocks instead of chasing a split you set on smoother ground. Use a grade-adjusted pace to turn your real fitness into honest targets for terrain this demanding.

Build your finish window around the 17:42 cutoff pace, not your PR pace

The 9-hour, 17:42-per-mile cutoff is the organizers telling you how slow this ground actually runs. Do not import a fast, flat 50K time and assume it holds. A vert- and terrain-aware finish prediction gives you a realistic window against this specific course, so you know your real buffer heading into the final loop instead of guessing.

⏵ Free tools to pace this course

Fueling strategy for a slow, technical 50K

Technical terrain like this stretches your time on feet well beyond what the mileage alone suggests, so fuel for the hours, not just the distance.

Carbs: fuel for time on feet, not mileage

Because the technical footing slows you down relative to a smoother 50K, plan your carb intake around your expected hours out there, roughly 60 to 90 grams per hour, leaning toward the higher end if your gut is trained for it. Every loop brings you back through the Windham Fire Station start/finish, so use that as a natural point to check whether you are actually keeping up with your target or falling behind.

Sodium and fluid: plan for a late-August Maine effort

Late August can still run warm and humid in Maine, so keep sodium in the 300 to 700-plus milligram per liter range depending on the forecast and your own sweat rate, leaning higher if it is hot. Carry enough between the loop crossings to cover the technical stretches where your pace, and your fueling rhythm, naturally slow down.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and this course's slow, technical pace with the free ultra fueling calculator. Browse the rest of the free running tools at the tools hub.

⏵ Free calculators for this race

Run your Firebird numbers with our free, no-signup tools, then let Summit Line tie all of it to your real fitness and this exact course.

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⏵ Train for it with Summit Line

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Firebird Trail Races FAQ

How hard is the Firebird Trail Races 50K?

It has a reputation in the region as crushingly technical, and the course backs that up. The 50K is three 10-mile loops through Lowell Preserve near Windham, Maine, extending into North Falmouth Community Forest, and running the same rooty, rocky singletrack three times means the technical footing does not let up as you get tired. The 9-hour cutoff works out to about 17:42 per mile, which is generous on paper, but that pace assumption tells you the organizers know this ground is slow, not fast.

What is the loop structure of the Firebird 50K?

The 50K is three loops of about 10 miles each, all starting and finishing at the Windham Fire Station. Running the same loop three times means you know exactly what is coming by lap two, which cuts both ways: no surprises, but no relief either. The technical sections you fought through on lap one are still there on lap three, just with more fatigue in your legs.

How should I fuel for Firebird Trail Races?

Plan for a technical course that will likely take longer than a similar distance on smoother trail, so build your fueling around time on feet rather than mileage alone. Most runners do well on roughly 60 to 90 grams of carbohydrate per hour, leaning toward the higher end if your gut is trained for it, with sodium scaled to the August heat, generally in the 300 to 700-plus milligram per liter range. Because every loop passes back through the start/finish at the Windham Fire Station, use that as a checkpoint to reset and check your numbers. Dial in your own plan with the free ultra fueling calculator.

What is the cutoff for the Firebird 50K?

The 50K has a 9-hour overall cutoff, which works out to roughly 17:42 per mile. That sounds like a lot of room, and for most trained runners it is, but the technical footing on this course eats time in a way flat trail does not. Do not assume a generous-looking cutoff means an easy day. Pace by effort on the technical sections and bank whatever time you can on the more runnable stretches.

What is the terrain like at Lowell Preserve?

Expect demanding New England singletrack: roots, rocks, and technical footing described by regional press as crushingly hard, spread across Lowell Preserve and into North Falmouth Community Forest. This is not a course where you settle into a rhythm and hold it. You are constantly adjusting your foot placement, which adds up over three loops.

What makes Firebird Trail Races different from other Maine 50Ks?

The Grind Run Company builds the entry structure around giving back: alongside the race fee, entrants are asked to donate to a nonprofit of their choice, and proceeds also go partly toward trail stewardship on the land you are running. Finishers get a hand-carved wooden Firebird medal instead of a mass-produced one, and the race gives out top awards across men's, women's, and non-binary categories.

This guide is independent and for planning only. The course details, dates, cutoffs, entry cost, 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.