⏵ Course guide · Snoqualmie / Cascade foothills
The Middle Fork Trail Run follows the Middle Fork Snoqualmie River through old-growth forest near North Bend, with modest climbing and one unbridged crossing at Burnt Boot Creek on the 50K and 22-Mile courses. I will walk you through the river-valley terrain and the creek crossing, then give you a pacing and fueling plan for a cool October day, with free calculators along the way.
These facts come from the official Northwest Trail Runs event page. Check the current year details, cutoffs, and aid stations before you commit. Race logistics change year to year.
Starting at the Middle Fork Trailhead, all four distances follow the Middle Fork and CCC trails along the Middle Fork Snoqualmie River, through old-growth forest with views of rugged mountain slopes and cliffs above the valley floor.
Because the routes follow the river valley rather than climbing to a ridge, the official course description calls the climb modest across every distance, with a few meanders of the trail up and down the valley slope rather than any sustained ascent. This is a course built around scenery and steady rhythm more than vertical challenge.
Both the 50K and 22-Mile courses cross Burnt Boot Creek, which has no bridge. By September the water is usually low enough to wade across easily, and the race generally builds at least a minimal log crossing for runners who prefer to keep their feet dry. Either way, expect a brief pause here to navigate the crossing safely.
The 50K continues past the Dingford Creek Trail junction to a bridge near Goldmyer Hot Springs before turning back, while the 22-Mile course also reaches that bridge via a different section of road and trail. These landmarks give you clear mental checkpoints to track your progress on an otherwise continuous river-valley route.
Staggered starts run between 8:00 AM and 10:00 AM depending on distance, and without major sustained climbing, this course rewards steady, consistent effort more than careful climb management.
With modest climbing throughout, a grade-adjusted pace target still helps smooth out the valley slope meanders, but the bigger lever here is simply holding a consistent, sustainable rhythm across the full distance rather than managing big effort swings.
A finish-time projection built from your training should account for a brief pause at the Burnt Boot Creek crossing on the 50K and 22-Mile courses, since wading or careful log-walking will cost you a few minutes you would not lose on a bridge crossing. Budget that time rather than being surprised by it mid-race.
⏵ Free tools to pace this course
October in the Cascade foothills near North Bend tends to run cool and often damp, with a real chance of rain, so plan your fueling and layers for wet trail rather than heat.
Aim for roughly 50 to 70 grams of carbohydrate per hour on the 50K, scaling down for the shorter distances. Without heavy climbing to disrupt your rhythm, steady intake at a consistent interval works well here.
Cool, often damp October conditions mean you likely will not sweat as heavily as on a warm-weather race, so sodium in the 300 to 500 mg per liter range is a reasonable starting point. Watch for rain gear and layering needs as much as fueling, since staying dry matters more than usual for comfort on this course.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a cool, possibly damp October 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 and this exact Middle Fork river-valley course profile, so race day is something you execute, not guess at.
The official course description calls the climbing "modest" across all four distances, since the routes follow the Middle Fork Snoqualmie River valley rather than climbing to ridgelines. The real challenge is the unbridged crossing of Burnt Boot Creek on the 50K and 22-Mile courses, plus old-growth roots and river-valley terrain that demands attention even without major elevation gain.
No specific elevation gain figure is published for any distance. The official course notes describe "modest climb" across all four races, a direct result of the courses following the Middle Fork Snoqualmie River valley floor rather than climbing to any ridge or summit, so expect gentle, rolling terrain rather than a defined mountain profile.
Both the 50K and 22-Mile courses cross Burnt Boot Creek, which has no bridge. The race notes that water is usually low enough by September to wade across easily, and the organizers generally build at least a minimal log bridge to allow a dry-foot crossing for runners comfortable walking across logs. Either way, plan for a brief creek crossing rather than assuming a dry trail the whole way.
With modest climbing and a river-valley course, this is a race where pace stays fairly consistent rather than swinging with big elevation changes. Aim for roughly 50 to 70 grams of carbohydrate per hour for the 50K, and adjust down proportionally for the shorter 22-Mile and Half Marathon distances. October in the Cascade foothills can run cool and damp, so plan fluids accordingly rather than over-hydrating for heat that may not show up.
The course runs through old-growth forest along the Middle Fork Snoqualmie River, with views of rugged mountain slopes, majestic cliffs, and the swiftly-flowing river itself. October in the Cascade foothills near North Bend typically brings cool, often damp conditions, and rain is a real possibility this time of year, so pack for wet trail and cooler temperatures rather than assuming a dry fall day.
With modest climbing relative to many Pacific Northwest ultras and a well-established local organizer in Northwest Trail Runs, this is a reasonable step-up race for a runner with some trail experience looking for their first 50K or 22-Mile. The unbridged creek crossing is a genuine but manageable obstacle, not a technical barrier, and the scenic old-growth river valley setting makes the distance feel shorter than the climbing profile alone would suggest.
Link this guide
Race directors and clubs: link or embed this guide anywhere. It stays current.
<a href="https://runsummitline.com/guides/middle-fork-trail-run">The Middle Fork Trail Run course guide</a><iframe src="https://runsummitline.com/embed/race/middle-fork-trail-run" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Middle Fork 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.
The timeline
Get the week-by-week countdown for this race: when to build, when to peak, when to taper.
One email with the timeline, plus training notes for this race. Unsubscribe any time.