This Event Took Place Sat. Feb 21, 2015


February 20th, 2016

50K | 35.5K (22mi) |Half Marathon | 13K

All distances start at 8:00am

Location: (New Start Location)

Google maps to start


The start/finish location has now been moved to Auburn. The reason for the move is that in the past years, most runners commute through the Hwy 80 corridor, with the race now starting in Auburn, it'll allow for an easier and faster access to the race.


Come and participate in one of the most challenging 50K in the Auburn/Cool area. This event has a total accumulative climbing of over 6000 feet.


The name FOURmidable comes from the four major climbs along the course. The 50K and 35.5K distances will cross the famous No Hands Bridge on their way out and climb up  K2 (aka-Training hill) towards the top of Knickerbocker Canyon  to then descend all the way down to the river. At which moment runners will be right on the other side of the American River canyon from the START area. Runners will then climb up the switchbacks back to the Knickerbocker AS to then cross Knickerbocker creek on their way towards Cool AS and then follow the Western States trail towards Auburn AS. The 35k runners would have completed their run and the 50k runners will then do a 5 mile loop up Cardiac hill before returning to the finish line.


FOUR hills:

  1. K2 (AKA Training Hill)

  2. Knickerbocker (Old Auburn Dam Site)

  3. Overlook hill

  4. Cardiac hill


The Half Marathon  and 13K runners will go downhill towards No Hands bridge by using the Western States and Robbie point trail, to then turn around and climb back up by using the river-view trail. Once back at the top, 13k runners would have finished and Half marathon runners will continue towards Cardiac hill to then cross the finish line by using the Pioneer Express trail.

Less than .5mi of road on any distance.


50K (31mi) & 35K (22mi)

Half Marathon (13.2mi & 13K (8mi)


2015 Pictures


Local time: 6:38 PM


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Paulo Medina
Race Director

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