Official Yosemite webpage on Tioga Road opening

For the latest prediction for opening of the Tioga Road (Highway 120 East through Tuolumne Meadows to Lee Vining), see the National Park Service webpage,
http://www.nps.gov/yose/planyourvisit/tioga.htm
You can also call the Park Service Road Conditions recording at +1-209-372-0200 (press 1 then 1), which tends to be more up-to-date on last-minute changes.
For a list of historical opening and closing dates of Tioga Road from 1980 to the previous year, see
http://www.nps.gov/yose/planyourvisit/tiogaopen.htm
For road status on the Tioga Road outside Yosemite National Park, see this CalTrans webpage
http://www.dot.ca.gov/hq/roadinfo/sr120
Edit: links updated June 2011.
http://www.nps.gov/yose/planyourvisit/tioga.htm
You can also call the Park Service Road Conditions recording at +1-209-372-0200 (press 1 then 1), which tends to be more up-to-date on last-minute changes.
For a list of historical opening and closing dates of Tioga Road from 1980 to the previous year, see
http://www.nps.gov/yose/planyourvisit/tiogaopen.htm
For road status on the Tioga Road outside Yosemite National Park, see this CalTrans webpage
http://www.dot.ca.gov/hq/roadinfo/sr120
Edit: links updated June 2011.