Happening on October 25, 2025, the fall edition of the Cougar Mountain Trail Run Series delivers a rugged and rewarding trail experience across the forested terrain of Cougar Mountain Regional Wildland Park. Runners can choose from four distances—5K, 7.6 miles, 19.5 miles, and a 50K ultra marathon—each offering single-track trails, rolling hills, creek crossings, fern-lined paths, and elevation ranging up to 7,200 feet of gain on the longer routes. Organized by the Seattle Running Club in collaboration with Northwest Trail Runs, the event supports King County Parks through race proceeds and volunteer hours. The community-driven atmosphere, well-marked courses, supportive volunteers, and generous cutoffs (up to ~5:00 PM) make this event accessible to trail runners of all levels. Whether you're chasing a technical PR or enjoying a scenic forest run, Cougar Mountain in October delivers a classic PNW trail experience with purpose.
Races
50 km
19.5 miles
7.6 miles
5 km
Race Date:
25 October, 2025
The 50 km Ultra is a demanding four-loop course covering scenic singletrack and ridge climbs, totaling ~7,200 ft of elevation gain—ideal for experienced trail runners. Organized by Seattle Running Club & Northwest Trail Runs, the event takes place on 25 October 2025, starting at Sky Country Trailhead, Cougar Mountain, Washington.
Weather based on historical averages.
FAQs
What is the Cougar Mountain Trail 50km?
How long is the Cougar Mountain Trail 50km?
Where does the Cougar Mountain Trail 50km take place?
What is the elevation gain of the Cougar Mountain Trail 50km?
How can I prepare for the Cougar Mountain Trail 50km?
How do I choose the right training plan for the Cougar Mountain Trail 50km?
The 50 km Ultra is a demanding four-loop course covering scenic singletrack and ridge climbs, totaling ~7,200 ft of elevation gain—ideal for experienced trail runners. Organized by Seattle Running Club & Northwest Trail Runs, the event takes place on 25 October 2025, starting at Sky Country Trailhead, Cougar Mountain, Washington.
The Cougar Mountain Trail 50km is 50km long.
The Cougar Mountain Trail 50km takes place in Newcastle, WA, USA.
The Cougar Mountain Trail 50km elevation gain is 2195 meters, which Runna classifies as a Hilly race.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Cougar Mountain Trail 50km?
The 50 km Ultra is a demanding four-loop course covering scenic singletrack and ridge climbs, totaling ~7,200 ft of elevation gain—ideal for experienced trail runners. Organized by Seattle Running Club & Northwest Trail Runs, the event takes place on 25 October 2025, starting at Sky Country Trailhead, Cougar Mountain, Washington.
How long is the Cougar Mountain Trail 50km?
The Cougar Mountain Trail 50km is 50km long.
Where does the Cougar Mountain Trail 50km take place?
The Cougar Mountain Trail 50km takes place in Newcastle, WA, USA.
What is the elevation gain of the Cougar Mountain Trail 50km?
The Cougar Mountain Trail 50km elevation gain is 2195 meters, which Runna classifies as a Hilly race.
How can I prepare for the Cougar Mountain Trail 50km?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Cougar Mountain Trail 50km?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
More
Sport:
Running
Tags:
Nature
Park
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Cougar Mountain Trail Run 2025 or Northwest Trail Runs. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Cougar Mountain Trail Run 2025 website.
