You can probably drive to the gate at Alder Springs. There is a campground there, so you should see it on maps. IIRC it's about 2200' in elevation, with the pass at around 5300'. I would be surprised if the pass isn't still snowbound by the 22nd, but it's still a gorgeous ride with no cars. Make sure your brakes have plenty of rubber ...
2011 Jamis Quest "Cy"
2009 Trek 7500 "Diesel"
2008 Rans Stratus LE recumbent "The 'Bentley"