The City of Poulsbo describes a dirt pump track at 20503 Little Valley Road, with rolling hills and jumps, and says the course is free and operated by the Evergreen Mountain Bike Alliance.
Free entry
Find your kind of fun
Poulsbo Pump Track
Outdoor
Surface
dirt
For beginners
Beginner provision not confirmed
Getting uphill
Not confirmed
Admission
Free
The city page describes rolling hills, jumps, and small dirt hills and curves, and says any non-motorized bike may be used.