Fall is the best time of year to race on trails. Cooler temperatures, hardened summer soil, and forests turning gold and red make every mile feel worth the suffering. If you've been training through the heat and you're ready to commit to a race, here are 21 trail marathons across the United States worth putting on your calendar for fall 2026.
This list covers beginner-friendly courses, technical mountain routes, and everything in between. Whatever your experience level, there's something here for you.
Why Fall Trail Marathons Deserve a Spot on Your Race Calendar
Trail running in fall hits differently than any other season. Average race-day temperatures across the Northeast and Mountain West drop into the 40s and 50s°F, which research consistently links to faster finish times and lower perceived effort compared to summer racing. Your body doesn't have to fight the heat, so more energy goes toward moving forward.
The visual payoff is real too. Running through Appalachian hardwood forests or Colorado aspen groves during peak foliage is an experience road racing simply can't replicate. If you've been on the fence about trail marathons, fall is the season that tends to convert runners for good.
That said, fall races fill up fast. Many of the events below open registration months in advance, and popular ones sell out within days. If you're still building your training base, check out how to pace your fall marathon training right now to make sure your preparation matches your target race date.
The Full List: 21 Trail Marathons for Fall 2026
These races are organized roughly by region. Entry fees are approximate and based on typical early-bird pricing. Always verify current registration details directly with race organizers.
Northeast
- Vermont 50 Trail Marathon (Vermont, late September). One of the most beloved fall trail events in New England. Rolling single-track, covered bridges, and classic Vermont foliage. Entry around $110. Beginner-friendly elevation profile.
- Mount Washington Valley Trail Marathon (New Hampshire, early October). Set in the White Mountains with views that earn every climb. Technical in sections, with around 2,800 feet of gain. Entry around $95.
- Delaware Water Gap Trail Marathon (New Jersey/Pennsylvania, mid-October). Runs along the Appalachian Trail corridor. Moderate difficulty, great for first-time trail marathoners crossing over from roads. Entry around $85.
- Breakneck Point Trail Marathon (New York, late October). A Hudson Valley classic. Shorter entry window due to popularity. Technical rocky terrain, stunning river views. Entry around $100.
- Finger Lakes Fifties Marathon (New York, mid-October). Gorges, waterfalls, and rim-trail running make this one of the most scenic courses in the Northeast. Entry around $90.
Southeast
- Pinhoti Trail Marathon (Alabama, early November). Held in the Talladega National Forest, this race has a loyal following and a fast-for-trails course. Great for runners targeting a trail PR. Entry around $80.
- Black Mountain Monster (North Carolina, late October). Big elevation, big views of the Blue Ridge. Roughly 4,500 feet of gain. Not for the faint-hearted, but the community atmosphere makes it approachable. Entry around $95.
- Cloudland Canyon Marathon (Georgia, early November). Starts and finishes near one of Georgia's most dramatic canyon overlooks. Technical descent sections require attention. Entry around $85.
- Frozen Ed's Trail Marathon (Tennessee, late October). Despite the name, fall conditions are manageable. Run through the Cumberland Plateau with roots, rocks, and ridge views. Entry around $75.
Midwest
- Potawatomi Trail Marathon (Michigan, mid-October). Entirely on the Potawatomi Trail in Pinckney Recreation Area. Rolling, runnable terrain. Ideal entry point for trail beginners. Entry around $70.
- Glacial Trail Marathon (Wisconsin, early October). Glacier-carved kettle moraines with beautiful mixed hardwood forests. Moderate difficulty, well-organized aid stations. Entry around $80.
- Land Between the Lakes Marathon (Kentucky, late October). Wide, runnable trail system with fall color throughout. Lower elevation gain makes it approachable. Entry around $75.
Mountain West
- Moab Trail Marathon (Utah, mid-November). Red rock canyon country at its finest. Slickrock sections, desert sage, and big open skies. Entry around $130. Altitude and sun exposure demand respect even in fall.
- Boulder Trail Marathon (Colorado, late September). Close to town but big on terrain. Flatirons backdrop, mix of dirt roads and technical single-track. Entry around $115.
- Flagstaff Sky Peaks Trail Marathon (Arizona, early October). High-altitude ponderosa pine forest above 7,000 feet. Cooler than you'd expect from Arizona. Entry around $100.
- Teton Crest Trail Marathon (Wyoming, mid-September). One of the most spectacular courses in the country. Passes iconic Teton views above 10,000 feet. Entry around $150. Lottery entry system. Register early.
Pacific West
- Headlands 50K Trail Marathon (California, early October). Technically a 50K but widely used as a marathon-distance trail race, right above the Golden Gate. Ocean views and dense fog are both possible. Entry around $130.
- Winthrop Mountain Run (Washington, late September). Cascades foliage at peak. Alpine terrain, exposed ridgelines. One of the Pacific Northwest's most rewarding fall races. Entry around $100.
- Forest Park Trail Marathon (Oregon, mid-October). Urban trail running at its finest. Portland's massive Forest Park offers 80 miles of trails, and this race uses the best of them. Entry around $85. Great first trail marathon.
- Cascade Crest Marathon (Washington, early October). Old-growth forest, creek crossings, and the smell of wet Pacific Northwest earth. Moderate difficulty. Strong community feel. Entry around $95.
- Eastern Sierra Fall Classic (California, late October). High desert meets the Sierra Nevada. Stunning, remote, and logistically worth the planning. Entry around $120.
How to Pick the Right Race for Your Level
If you're new to trail running, prioritize races with lower elevation gain (under 2,000 feet), well-stocked aid stations, and generous cutoff times. The Potawatomi Trail Marathon, Forest Park Trail Marathon, and Delaware Water Gap events are all strong starting points.
Experienced trail runners looking for a serious challenge should look at the Teton Crest, Black Mountain Monster, or Moab Trail Marathon. These courses demand solid technical skills, heat or altitude management, and smart pacing strategies.
One thing every runner on this list should account for: strength training. Research on strength training's weekly volume sweet spot suggests that even modest resistance work, done consistently, significantly reduces injury risk during high-mileage blocks. Trail running puts lateral stress on the hips, ankles, and knees that road running simply doesn't replicate.
Don't Let a Training Gap Derail Your Fall Plans
Summer is when trail marathon training goes sideways for a lot of runners. Heat, travel, or life interruptions cause breaks in training that feel catastrophic but often aren't. Understanding how fast you actually lose fitness when you stop training can help you recalibrate instead of panic-training yourself into an injury.
The good news is that aerobic base takes longer to erode than most runners fear. A one or two week gap rarely costs you more than a marginal fitness dip, and structured return training can rebuild your base faster than the original build took.
Fuel Your Training Like the Race Depends on It
Fall training ramp-ups require real nutritional attention. Long weekend runs, back-to-back training days, and increased weekly mileage all demand more calories, more protein, and smarter carbohydrate timing than most runners actually practice. Eating strategically for a fall training ramp-up is a skill worth developing now, before race day forces the issue.
Pay particular attention to your recovery nutrition after long trail runs. Electrolyte depletion is a real factor on hot early-fall days, and under-fueling between long efforts is one of the most common reasons runners show up to race day already depleted.
A Few Final Logistics Points
Trail marathons have different requirements than road races. Many require mandatory gear: headlamps, emergency blankets, hydration vests, or trekking poles depending on terrain and elevation. Read the race requirements carefully and don't skip the gear list.
Most fall trail races also have altitude or weather variables that early-season runners underestimate. The Teton Crest and Flagstaff events can see overnight temperatures near freezing by race morning in October. Moab in November can be cold in the shade and warm in direct sun on the same course.
Fall 2026 is shaping up to be a big year for trail running in the US, with more events than ever and growing interest across the sport. If you're curious about how trail running culture is evolving at the organized level, the keynote lineup at the US Trail Running Conference gives a solid read on where the sport is heading.
Pick your race. Check the cutoff times, gear requirements, and registration windows. Then get on the trails.