Summit Line

⏵ Course guide · New England fall trail festival

TARC Fall Classic Course Guide

The TARC Fall Classic sends a full ladder of distances, from a 10K up to a 50 Mile, around the woods and fields of Great Brook Farm State Park in Carlisle, Massachusetts. This is a cupless race with no pacers at any distance and a well-earned reputation for selling out. I will walk you through the loop format and cutoffs first, then give you a pacing and fueling plan built for a full day of rolling New England singletrack, plus free tools to dial in your own numbers.

⏵ At a glance

TARC Fall Classic quick facts

Date
Saturday, September 5, 2026
Location
Hart Barn Ski Center, 1018 Lowell St, Carlisle, MA (Great Brook Farm State Park)
Distances
50 Mile, 50K, 20 Mile, Half Marathon, 10K, Yeti Mischief Mile, free youth fun run
Start times
50M & 50K: 6:00 AM · 20M, Half & 10K: 8:00 AM · Youth fun run: 10:00 AM · Yeti Mischief Mile: 11:00 AM
Format
50M/50K/20M run 10-mile loops (aid every 3-4 mi); Half/10K run 10K loops (aid at start/finish only)
Cutoff
Final 10-mile loop must start by 4:00 PM; course closes at 7:00 PM (13 hours from a 6:00 AM start)
Aid
Cupless race, bring your own hydration system; vegan-friendly aid stocked with real food, not just gels
Entry
$25 flat across every paid distance; no race-day registration; sells out every year

These facts come from the official race page. Check the current year details, cutoffs, and aid stations before you commit. Race logistics change year to year.

The course: two loops, five distances

Everything at TARC Fall Classic is built from two loops. The 50 Mile, 50K, and 20 Mile run a 10-mile loop (the 50K adds two extra laps around the start-area open field for its extra mile, the 20M simply runs the 10-mile loop twice). The Half Marathon and 10K run a shorter 10K loop, with the Half adding one lap of the open field first.

Cupless, and the aid stations mean it

TARC Fall Classic is a cupless race: bring your own bottle, cup, or vest, because aid stations will not have disposable cups. What you get in exchange is a genuinely well-stocked, entirely vegan-friendly spread on the 10-mile loop, watermelon, orange, and banana slices, dried fruit, a wall of cookies and candy, potato chips, peanut butter and Nutella sandwiches, boiled potatoes, vegan quesadillas, and pickles, at two aid stations every 10-mile lap. The 10K loop used by the Half and 10K only has aid at the start/finish, so plan your carry accordingly on those shorter distances.

No pacers, ever, and crew stays at the start/finish

Pacers are not allowed for any distance at TARC Fall Classic, full stop. Crew access is limited to the start/finish aid station; crews should not attempt to visit the road-crossing aid station, both to keep that access point clear for volunteers and because parking at the start/finish itself is tight until around noon. If you are counting on a pacer for the back half of your 50 Mile, this is not that race.

Sells out every year, no race-day registration

TARC keeps entry to a flat $25 across every paid distance to keep the event accessible, but that means it sells out. There is no race-day registration, and online registration closes at the beginning of race week. With around 500 parking spots for 600-plus participants, carpooling is genuinely necessary, not just a suggestion, especially if you are crewing or spectating.

Pacing strategy for the 50K and 50 Mile

The 4:00 PM final-loop start and 7:00 PM course close give you 13 hours from a 6:00 AM start, but the road-crossing aid station cutoffs (5:00 PM out, 6:00 PM back) can bite earlier than the overall cutoff if you fall behind.

Watch the road-crossing cutoffs, not just the finish

The road-crossing aid station sits 3 miles into each 10-mile loop and again at mile 7 on the way back, and both have their own departure cutoffs. A vert-aware finish estimate built off your early loop splits helps you check your margin at those intermediate cutoffs, not just at the final 4:00 PM last-loop deadline, since falling behind at mile 3 of a loop compounds by mile 7.

Plan for rolling terrain, not flat splits

With roots, rocks, and rolling woods and fields rather than one defining climb, a grade-adjusted pace target gives you a more honest number than a flat-course pace chart, especially by loop four or five on the 50 Mile when the "trippables" the race warns about start to matter more.

⏵ Free tools to pace this course

Fueling strategy for a cupless day

Bring your own hydration system, then use TARC's genuinely good, vegan-friendly aid station spread to keep your carry light on the longer distances.

Carbs: real food is on the menu, use it

Aim for roughly 60 to 90 grams of carbohydrate per hour. TARC's aid stations lean toward real food, boiled potatoes, sandwiches, quesadillas, pickles, alongside the usual cookies and candy, so you can mix carbohydrate sources more than a gels-only plan allows. On the 50M/50K/20M loop, aid comes every 3 to 4 miles, so plan your intake around that rhythm.

Hydration: your own system, no exceptions

Since this is a cupless race, your bottle, cup, or vest is your only water source at every stop. Keep sodium in the 300 to 700 mg per liter range, and if you are running the Half or 10K, remember aid only exists at the start/finish on that shorter loop, so plan accordingly if you tend to need mid-loop fluid.

⏵ Build your fueling plan

Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a full day on rolling New England trail 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 looped Great Brook Farm course, and your projected splits. Summit Line reads your real training, builds a plan for repeated New England loops, and rehearses your fueling so race day is something you execute, not guess at.

TARC Fall Classic FAQ

How hard is the TARC Fall Classic?

TARC calls its own courses "beginner friendly," and by New England trail standards, they largely are: rolling woods and fields around Great Brook Farm State Park with the typical roots, rocks, and other "trippables" rather than sustained mountain climbing. That said, the 50 Mile is still 50 miles on New England singletrack, run cupless with a real 13-hour cutoff, and no pacers are allowed at any distance, so the difficulty scales with how far you sign up for rather than any single defining feature of the terrain.

How much climbing is in the TARC Fall Classic?

No specific elevation gain figure is published for the course. The race describes Great Brook Farm State Park as scenic woods and fields with typical New England rolling terrain, roots, and rocks, rather than significant sustained climbing. Expect a rolling, technical-underfoot course more than a hilly one.

How should I fuel for the TARC Fall Classic?

This is a cupless race, meaning you must bring your own hydration system (bottle, cup, vest, or similar) since aid stations will not provide disposable cups. The 10-mile loop used by the 50M, 50K, and 20M has aid every 3 to 4 miles and is genuinely well stocked: Hyle Hydration, soda, water, ice, fresh fruit, dried fruit, an assortment of cookies and candy, potato chips, peanut butter and Nutella sandwiches, boiled potatoes, vegan quesadillas, and pickles, all vegan friendly. Aim for roughly 60 to 90 grams of carbohydrate per hour on the longer distances, and lean on the aid station's real food rather than relying only on gels. Build your numbers with the free ultra fueling calculator before race day.

What are the cutoff times for the TARC Fall Classic?

Runners in the 50K and 50M must start their final 10-mile loop by 4:00 PM, and the course officially closes at 7:00 PM, giving you 13 hours from the 6:00 AM start. There is an additional cutoff at the road-crossing aid station on the 10-mile loop: you must depart it by 5:00 PM heading out (mile 3 of the loop) and by 6:00 PM heading back (mile 7 of the loop). No race-day distance changes or drop-downs are allowed, so plan your entry distance carefully before race day.

What is the course and terrain like at the TARC Fall Classic?

The 50M/50K/20M distances run repeated 10-mile loops through Great Brook Farm State Park, with the 50K adding two extra laps around the start-area open field before joining the 10-mile loop, and the 20M simply running the 10-mile loop twice. The Half and 10K run a shorter 10K loop, with the Half adding one lap around the open field first. All courses mix scenic New England woods and fields with the roots and rocks typical of the region. Lighting or a headlamp is advisable for 50K and 50M runners on their first loop, since sunrise is around 6:16 AM and the 50M/50K starts at 6:00 AM.

Is the TARC Fall Classic a good first ultra?

The 20 Mile is a solid stepping stone if a full ultra feels like a reach, and the loop format (passing the start/finish and your own gear every 10 miles) makes crewing yourself straightforward. For a first 50K, TARC's own beginner-friendly framing and the generous 13-hour window are real advantages, though the cupless policy and the no-pacer rule at every distance are details newer ultra runners sometimes overlook when planning. This event sells out every year and offers no race-day registration, so register well in advance if you want in.

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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.

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