This page (http://www.nps.gov/crla/crlaci.htm) gives current access information for Crater Lake NP.
While Rim Village is kept open year-around, Rim Drive is closed. Moreover, the north entrance road (Oregon Highway 138) is closed, so the only access to Rim Village is via the south (Oregon Highway 62).
This NPS page (http://www.nps.gov/crla/pphtml/basics.html) gives basic road directions to the park.
Two campgrounds in the park, neither of which are open during the winter months.
Two lodges inside the park; again, neither are open during winter.
Backcountry camping is allowed during the winter. A NPS page (http://www.nps.gov/crla/brochures/wintback.htm) nicely outlines all the red tape and logistics. A similar page (http://www.nps.gov/crla/brochures/backcountry.htm) outlines summer backcountry regulations. The Pacific Crest Trail passes through the park.
No more such a thing as Golden Eagle/Age/Access Passes
Hasn't voted
Now there is a $80 America the Beautiful Federal Lands Recreation Pass good for entrance to all National Parks, National Forests, BLM, US Fish & Wildlife, and Bureau of Reclamation sites for one year from date of purchase. If you're disabled, you may want to get an Access Pass which are free and good for a lifetime. If you're 62 years of age or older, a Senior Pass can be purchased for $10 and they're also good for a lifetime. Click here for more info on fees and passes.
Existing National Park Passes and Golden Age/Access/and Eagle Passes will be honored until they expire.