Wow!
Thank you - you should have put in a guess! I just guessed May 11th at 8 am.
Caltrans confirms it's open from Lee Vining to the park gate. Monitor Pass is open, Sonora and Ebbetts are still closed.
NPS.GOV confirms:
EDIT: In the interest of fairness, if I win I will share the prize with you unless you choose to put in a guess for a different day and time.Last update: April 19, 2013
Glacier Point Road: Plowing begins April 22.
Tioga Road: Plowing begins April 29.