⏵ Course guide · Henry Hagg Lake, Gaston
Hagg Mud loops Henry Hagg Lake in Scoggins Valley Park, running since 2001 as one of Oregon's classic winter mud races, with a 50K and 25K, cupless aid stations, and generous but real cutoffs. I will walk you through the course and format first, then give you a pacing and fueling plan built for a cold, muddy February day. There are free calculators along the way to dial in your own numbers.
These facts come from the official Oregon Road Runners Club event page. 2027 registration is not yet open, check orrc.net before you commit, and confirm current-year cutoffs and aid station details before you race.
Both distances loop Henry Hagg Lake from the C-Ramp Recreation Area, with lovely views and real trail, but genuine mud is part of the deal.
The course loops Henry Hagg Lake in Scoggins Valley Park, described by the race itself as offering "lovely views, excellent trails." This event has been challenging runners "who like getting muddy" since 2001, with a break in 2020 and 2021.
Aid stations run cupless, so bring your own hydration container, whether that is a handheld, a bottle, or a pack. Stations stock fruit, sweet and salty snacks, soda, Gatorade, and GU, so plan your carrying setup ahead of time rather than assuming a cup will be handed to you.
The 50K cannot accommodate walkers, so plan on a running or run-walk effort throughout rather than treating the distance as a hike. The 25K has no such stated restriction.
Both distances give you real time to work with, but the mud can slow you more than the stated pace requirement suggests.
The 50K has intermediate cutoffs, through the Dam Aid Station by 1:15 PM and Fenders Blue by 3:00 PM, on top of the first-lap noon cutoff, so pace to those checkpoints rather than only to the finish. The overall pace requirement, about 17:10 per mile, sounds generous on dry trail but leaves less room once mud slows your actual footing.
⏵ Free tools to plan your effort
Mid-February at Henry Hagg Lake means cold, wet conditions on top of the mud, so layer and fuel for staying warm as much as for the effort itself.
Aim for roughly 60 to 90 grams of carbohydrate per hour on the 50K, and sodium in the 300 to 700 mg per liter range. Since aid stations are cupless, dial in your hydration container ahead of time and make sure it works with cold hands and wet gloves.
⏵ Build your fueling plan
Get a carb, sodium, fluid, and caffeine plan per hour built for your weight, your goal time, and a cold February Oregon 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 training plan built around YOUR fitness and the kind of cold, muddy footing this lake loop demands. Summit Line reads your real training, builds the durability your chosen distance asks for, and rehearses your fueling so race day is something you execute, not guess at.
Aggregator listings point to February 13, 2027, consistent with the 2026 race's February 14 date, but the Oregon Road Runners Club has not yet opened registration or confirmed the exact 2027 date on its official event page. Check orrc.net before you commit to travel plans.
Both the 50K and 25K run a loop format around Henry Hagg Lake, starting and finishing at the C-Ramp Recreation Area in Scoggins Valley Park. The race describes "lovely views, excellent trails," but as the name suggests, expect genuinely muddy conditions, this event has challenged runners "who like getting muddy" since 2001.
Total elevation gain is not published, but the 50K's cutoff pace works out to about 17:10 per mile and the 25K's to about 29:00 per mile, both generous windows that suggest a manageable trail course made harder mainly by mud and footing rather than sustained climbing. The 50K's no-walkers policy means you need to keep moving at a running effort throughout, even if that effort is a run-walk shuffle through the muddiest sections.
For the most recent edition, the 50K had a first-lap cutoff at noon, needed to be through the Dam Aid Station by 1:15 PM, and through the Fenders Blue aid station by 3:00 PM, about a 17:10 min/mi average pace. The 25K had 7.5 hours to finish its 15.5 mile course, about a 29:00 min/mi average pace. Confirm current-year cutoff times on the official ORRC page before race day.
Aid stations run cupless, so you need to bring your own hydration container, a handheld, bottle, or hydration pack works. Stations stock fruit, sweet and salty snacks, soda, Gatorade, and GU, but you cannot count on being handed a cup of anything.
The 25K is the gentler entry point at 15.5 miles with a generous 7.5 hour window, roughly a 29:00 min/mi average pace, forgiving for a first longer trail effort. The 50K's no-walkers policy and tighter aid station cutoffs make it a step up, better suited to runners who have already handled muddy footing and want a genuine test rather than a forgiving first ultra.
A mid-February race in the Pacific Northwest means cold, wet conditions on top of the mud, so plan fluids and layering for cold-weather racing rather than a warm-day plan. Aim for roughly 60 to 90 grams of carbohydrate per hour on the 50K, and sodium in the 300 to 700 mg per liter range. Since aid stations are cupless, dial in your own hydration container and carrying plan ahead of time with the free ultra fueling calculator.
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<a href="https://runsummitline.com/guides/hagg-mud-50k-25k">The Hagg Mud 50K & 25K course guide</a><iframe src="https://runsummitline.com/embed/race/hagg-mud-50k-25k" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Hagg Mud 50K & 25K 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.
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