Oregon Parks are hosting hikes in 29 locations, all of which waive their $5 daily parking fee for hike participants. The hikes closest to Portland are at Tryon Creek SP, LL Stub Steward SP, Champoeg SP, and Milo McIver SP. There are others up and down the coast, in the valley, in the gorge, and a few in central Oregon as well. You can find a complete list on OSP’s website listed by regions, and on their calendar including links to event details and directions.
Washington State Parks also host hikes in 29 locations and is waiving the day use fee for New Year’s Day as well. The closest hike to Portland takes place at Cape Disappointment State Park where the Columbia River meets the Pacific Ocean. On their website, WSP lists hikes by region and on the parks calendar as well.
As always, dress for the weather, be prepared, and check the roads before you head out.