⏵ Course guide · Mid-Atlantic out-and-back
Catoctin sends you on a rocky out-and-back from Manor up to High Knob and back, through Cunningham Falls and Gambrill State Parks, on a course the organizers themselves admit is uphill no matter which direction you're heading. I will walk you through the route and cutoffs first, then give you a pacing and fueling plan built for an out-and-back where every rocky mile out gets repeated coming back, plus free tools to dial in your own numbers.
These facts come from the official UltraSignup registration page. Course markings, aid, and logistics can change year to year, so confirm the current details before you register or run.
Both distances run out-and-back on the Catoctin Blue Trail between the Manor parking area in Cunningham Falls State Park and High Knob in Gambrill State Park.
From Manor, the course climbs Bob's Hill before turning onto the Catoctin Blue Trail south, crossing a stream and Catoctin Hollow Road, then climbing to an overlook and through the Frederick Water Shed to the Delauter and Hamburg aid stations. The trail is almost entirely covered with tree foliage, which brings welcome shade but also roots and rock that demand real attention underfoot.
The organizers point to two things in the course's favor: shade from the tree canopy, and several stream crossings where you can cool off. Everything else is a warning wrapped in a joke, "no matter the direction it's always up hill," which is their own honest summary of what this course does to your legs over 31 miles of out-and-back.
The 50K covers the entire route, Manor to High Knob and back. The Half Cat only runs the return leg: buses take runners from Manor to High Knob to start, so Half Cat entrants experience the same technical trail without the outbound climb the 50K field has already banked.
With roughly 10 hours for the 50K and just under 9 for the Half Cat, and no fresh terrain waiting on the return leg, an honest outbound pace matters more here than on a loop or point-to-point course.
Because you retrace the same rocky trail on the way back, an aggressive outbound pace does not just risk blowing up, it guarantees you repeat the exact same technical terrain on tired legs. A grade-adjusted pace target for the climbs to High Knob gives you a realistic number for both directions, not just the easier one.
The High Knob turnaround is a natural checkpoint: your split to that point, checked against a finish-time projection, tells you honestly whether the 5:50 PM cutoff is comfortable or tight. Given how technical this trail is, do that math at the turnaround, not in the final miles when adjusting your effort is much harder.
⏵ Free tools to pace this course
The tree canopy keeps most of the course shaded, a real advantage once June heat sets in, but the technical footing still burns through your legs and your fuel faster than the mileage alone suggests.
With named aid stations at Delauter and Hamburg on the outbound leg plus the Manor start/finish, aim for roughly 60 to 90 grams of carbohydrate per hour and plan what you carry between those points, since aid is not constant along the whole route.
Keep sodium in the 300 to 700 mg per liter range, and take advantage of the several stream crossings on course to cool down if late June turns warm, even with most of the trail shaded. Humidity under a full canopy can still add real heat stress even when direct sun is not a factor.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a shaded but potentially humid June 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 rocky out-and-back climbing 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.
Harder than the modest Catoctin ridgeline sounds on a map. This is an out-and-back from the Manor parking area in Cunningham Falls State Park up to High Knob and back, and the race's own organizers describe it as "rocky, slow, difficult and demanding, but yet run-able," with a running joke built into the course description that no matter which direction you are heading, it is uphill. Total elevation gain is not published, but the terrain, rocky singletrack with stream crossings and a mostly shaded canopy, is consistently described as one of the tougher 50Ks in the mid-Atlantic.
The 50K runs from Manor up Bob's Hill, then south on the Catoctin Blue Trail, crossing a stream and Catoctin Hollow Road before climbing to an overlook, through the Frederick Water Shed to the Delauter and Hamburg aid stations, then south through Gambrill State Park to the Catoctin Blue trailhead. From there it climbs to High Knob, the turnaround point, before retracing the entire route back to Manor. The Half Cat starts at High Knob (the 50K's turnaround) and runs only the return leg back to Manor.
The 50K starts at 8:00 AM and the course closes at 5:50 PM, giving you just under 10 hours. The Half Cat starts at 9:00 AM (after a bus ride from Manor to High Knob) and closes at the same 5:50 PM, roughly 8 hours 50 minutes. There is no published intermediate cutoff at Delauter or Hamburg, but with the entire course being a rocky out-and-back, pace conservatively on the way out since every mile you cover slowly there, you repeat on the way back.
With the Delauter and Hamburg aid stations on the outbound leg and the Manor start/finish, plan your carbohydrate intake around those touchpoints rather than assuming frequent aid throughout. Aim for roughly 60 to 90 grams of carbohydrate per hour and sodium in the 300 to 700 mg per liter range, and take advantage of the several stream crossings along the way to cool off if late June weather runs warm and humid. Build your numbers ahead of time with the free ultra fueling calculator.
It is a demanding one. The out-and-back structure means you retrace every rocky, hilly mile you just ran, so there is no fresh terrain to distract you on the way back, only fatigue on the same climbs. If you have trained on rocky, technical mid-Atlantic singletrack and respect the roughly 10-hour cutoff, it is a legitimate, well-regarded first 50K, but it is not a forgiving introduction to the distance the way a flatter or more runnable course would be.
Registration runs through UltraSignup with a field cap of 200 for the 50K and 130 for the Half Cat, and the race has sold out in past years, so register early. Registration closes June 16, refunds are 75% before May 19 and none after May 20, and there are no deferrals or bib transfers, so confirm your training and travel plans before you commit.
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<a href="https://runsummitline.com/guides/catoctin-50k">The Catoctin 50K Trail Run course guide</a><iframe src="https://runsummitline.com/embed/race/catoctin-50k" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Catoctin 50K Trail Run 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.