If you are looking for a very tough 5k race in the hills, the McMinnville XC Team is hosting the 10th annual Trask Mountain Assault.
It has 4 water crossings and several tough hills which are as muddy as you can imagine. It is a blast.
The open race($5) begins at 11am and the race site is the Flying "M" Ranch NW of McMinnville, Oregon. There are kids races and of course HS races as well.
Directions can be found at
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They also have a restaurant and an airstrip...