FOURmidable - FOURmidable 13k
Also in this race
These events were grouped as one card in discovery—pick another distance or date without going back.
External Event
Distance
8.1 mi
Pace
All paces
Terrain
Road
Difficulty
All Levels
About this run
FOURmidable Trail Run (50K | 35K | Half Marathon+ | 13K) Presented by SingleTrack Running Location: Auburn Overlook Park — 855 Pacific Ave, Auburn, CA 95603 Are you ready to test your grit on one of Northern California's premier trail challenges? Hosted in the endurance capital of the world, the FOURmidable Trail Run takes runners through the rugged, scenic canyon trails of the Auburn and Cool areas. Featuring less than one mile of pavement across all distances, this event treats you to singletrack trails, river canyon views, and the infamous climbs that give the race its name. The Four Climbs The signature 50K course packs over 6,000 feet of cumulative elevation gain, headlined by the "FOUR" formidable climbs: Cardiac HillK2 (aka Training Hill)Knickerbocker (Old Auburn Dam Site)Overlook Hill Whether you take on the full 50K ultra or choose the 35K, Half Marathon+ (13.2 mi), or 13K, you will experience the best singletrack Auburn has to offer. Race Schedule & Start Times All distances run on race day. DistanceStart Time50K8:00 AM35K8:15 AMHalf Marathon+ (13.2 mi)8:30 AM13K9:00 AM What's Included Custom Swag & Bibs: SingleTrack Running takes pride in quality, practical swag designed to celebrate your finish without cluttering your closet.Fully Stocked Aid Stations: Staffed by experienced trail volunteers ready to help refuel and hydrate you quickly. Stations include water, electrolyte drink, gels, soda, boiled potatoes, candy, salt tabs, and more.Post-Race Celebration: Finish at Overlook Park with plenty of hot food, drinks, and trail camaraderie. Important Event Logistics 1. Cupless Racing In an effort to keep trails clean and minimize waste, FOURmidable is a 100% cupless event. Every runner must carry a handheld bottle, hydration pack, or reusable collapsible cup.Paper cups will not be provided at aid stations. Collapsible cups will be available for purchase on-site, or you can bring your own. 2. Packet Pick-Up Early Pick-Up (Recommended): Friday (day before the race) from 3:00 PM – 6:00 PM at the Start/Finish area (Auburn Overlook Park).Race Morning: Available at Overlook Park starting 1 hour prior to your wave start. Note: Any swag/bibs not claimed by race start will be gifted to race-day volunteers. 3. Parking & Vehicle Camping Runner Parking: Primary parking at Overlook Park is reserved for registered runners. Overflow parking is available along Pacific Ave and at the nearby staging area (staging area parking requires a paid fee—please obey posted local signs).
Typical conditions
For events around February 2027 in Auburn, CA, United States: Typical mid-winter / cooler season in this region — dress in layers and check the official page for weather-related changes.
How to prepare
A 10K benefits from a mix of easy mileage and one quality workout weekly. Build toward a long run of about 8–12 km in the weeks before the event, and keep taper light.
Find more short races near youGetting there
This event is listed in Auburn, CA, United States. Confirm the exact start venue, parking, and transit options on the official registration page.
Registration is handled by the official event organizer
Know a local group? Host a community run in Auburn
Also in this race
- Feb 13, 2027 · 2:00 PM
- Feb 13, 2027 · 2:15 PM
- Feb 13, 2027 · 2:30 PM
- Feb 13, 2027 · 2:45 PM (this one)




