Forest Park is a scenic jewel in the heart of urban Portland, Oregon. The park's 5,157 acres are packed with more than 80 miles of gorgeous, single-track, soft-surface trails and are frequented by some of the nation's best elite runners. The narrow trails wind through dense northwest greenery, rising and falling with the land. The mild temperatures of the Pacific Northwest make Forest Park accessible to runners year-round, though the famous Oregon rainfall can lead to a slippery, muddy adventure run, so checking the forecast before hitting the trails is always a good idea.