⏵ Course guide · New Jersey winter loop race
Febapple sends every distance around the same rocky 10-mile loop at South Mountain Reservation in the dead of a New Jersey winter, with a firm 7:00 PM finish deadline and a hard 4:30 PM final-loop cutoff for the 50M. I will walk you through the loop structure and cutoffs first, then give you a pacing and fueling plan built for a cold, technical repeated-loop day, plus free tools to dial in your own numbers.
These facts come from the Fleet Feet race listing. This is a small, community-scale race and its listing had a date labeling inconsistency at the time this guide was written, so confirm the current year, cutoffs, and course before you register or run.
All four distances run the same approximate 10-mile loop through South Mountain Reservation, starting and finishing at the Summit Field picnic area.
South Mountain Reservation is a rocky New Jersey trail system, and a February date means you should plan for the real possibility of snow, ice, or mud on top of the natural rock underfoot. Bring a headlamp regardless of your planned finish time, since a slow day can push you past daylight hours.
Start times stagger by distance, 50M at 7:00 AM, 50K at 8:00 AM, 20M at 9:00 AM, and 10M at 10:00 AM, but every runner shares the same 7:00 PM finish deadline regardless of when they started. That structure rewards an early, efficient start more than it rewards raw speed.
With only 10 finishers in the 2026 50M and 19 in the 50K, this is a community-scale event rather than a large production. Expect less crowd energy on course than a bigger race, but also a more personal, low-key atmosphere among a small group of committed winter ultrarunners.
The published average-pace requirements, 14 min/mile for the 50M and 22 min/mile for the 50K, are your real targets here, more useful than an abstract finish time.
The 50M has a hard intermediate deadline: you must begin your final 10-mile loop by 4:30 PM. That means your first four loops need to average well inside your 14 min/mile target, not exactly at it, so you have real margin heading into the last one, especially since rocky footing and winter conditions tend to slow the back half of a race more than the front.
Because every loop is the same distance, your per-loop split is a direct, honest signal: compare it to your required average pace after every loop, not just at the halfway point, so you catch a slowing trend early enough to adjust rather than discovering it on your last lap.
⏵ Free tools to pace this course
Cold weather changes your fueling needs even though the calories you burn stay high, and thirst is a less reliable signal in winter than in summer.
Aim for roughly 60 to 90 grams of carbohydrate per hour. Cold weather can dull your appetite even as your body keeps burning through glycogen at a normal or elevated rate, so stick to your planned intake schedule rather than eating only when you feel hungry.
Keep sodium in the 300 to 700 mg per liter range, and keep drinking on a schedule even though cold weather blunts your thirst response. Consider an insulated bottle or a warm option to prevent freezing if temperatures drop, since a frozen hydration system is a real risk at a February race.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a cold New Jersey February day 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 loop count, and your projected splits. Summit Line reads your real training, paces you against the 4:30 PM final-loop cutoff, and rehearses your fueling so race day is something you execute, not guess at.
Febapple stacks two challenges: rocky South Mountain Reservation loops, and the fact that it runs in February, when winter conditions are a real possibility on top of the technical footing. It is also a genuinely small race, with only 10 finishers in the 50M and 19 in the 50K in 2026, so do not expect a crowded field to pace off of. The 50M pace requirement, 14 minutes per mile average, is manageable on paper but demanding on rocky, potentially icy or snowy loops.
All four distances run the same approximate 10-mile loop at South Mountain Reservation, starting from Summit Field. The 50M runs it roughly five times, the 50K roughly three, the 20-miler twice, and the 10-miler once. Start times are staggered, 50M at 7:00 AM, 50K at 8:00 AM, 20M at 9:00 AM, and 10M at 10:00 AM, but every distance shares the same 7:00 PM finish deadline.
Every race must finish by 7:00 PM. For the 50M, that means holding roughly a 14-minute-per-mile average, and there is a hard intermediate deadline: you must start your final 10-mile loop by 4:30 PM to be allowed to continue. For the 50K, the requirement is roughly a 22-minute-per-mile average. Race organizers reserve the right to end your race if you will not finish by 7:00 PM, so treat these as firm, not aspirational.
With a February date at South Mountain Reservation, plan for cold-weather running: layer for temperatures that can swing through the day, and bring a headlamp since late finishers may be out past daylight. Aim for roughly 60 to 90 grams of carbohydrate per hour and sodium in the 300 to 700 mg per liter range, and remember that cold weather can blunt your thirst response even though you still need consistent fluid intake. Build your numbers with the free ultra fueling calculator before race day.
The repeated 10-mile loop through the same reservation gives you frequent access to the start/finish area, useful for a first ultra's logistics and mental math. But between the rocky footing, likely winter conditions, and firm cutoffs (especially the 4:30 PM final-loop deadline for the 50M), this is a demanding rather than gentle introduction to the distance. A first-time 50K entrant with some rocky-trail experience and cold-weather training is better positioned here than a complete beginner.
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<a href="https://runsummitline.com/guides/febapple-frozen-fifty">The Febapple Frozen Fifty course guide</a><iframe src="https://runsummitline.com/embed/race/febapple-frozen-fifty" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Febapple Frozen Fifty 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.