Join a fun series of four 10K trail races set in the scenic Pickall Area of Patapsco Valley State Park near Windsor Mill, MD, featuring tough terrain in a relaxed, inclusive environment that welcomes everyone from experienced trail runners to first-timers. This community-focused grassroots event is run by dedicated park lovers and uses electronic timing, with a nice perk: Friends of Patapsco Valley State Park members get $27 off the full series price.