From the NPS site:
"I am pleased the National Park Service is taking advantage of the unexpected early snowmelt to allow cyclists and pedestrians vehicle-free access to much of the road around Crater Lake," said U.S. Representative Peter DeFazio. "I have encouraged the National Park Service to provide this kind of opportunity at Crater Lake for several years. I applaud their willingness to allow this kind of use this weekend, giving Oregonians a great chance to experience the park in a different way."
Pack up and go south this weekend. Maybe a strong cyclist/runner/walker turnout will encourage the NPS to make the car-free weekend an annual occurrence. Note, there will be cars on a few of the other park roads (see below).
Under the plan, East Rim Drive will be open to non-motorized vehicles only (except for administrative and emergency vehicles) from the North Junction around the East Rim of Crater Lake all the way to the intersection at Crater Lake National Park Headquarters and the Steel Visitors Center. Hwy 62 through the south end of the park, West Rim Drive and the North Entrance Road will be open to vehicles. Regular parking areas will be open, but generally fill up quickly.