Yosemite National Park - Tioga Road Opening & Closing Dates (U.S. National Park Service)

Plow clearing the Tioga Road; snowbanks on both sides of road

Clearing of the Tioga Road begins on or about April 15 each year and usually takes between one and two months. Predicting when the road will open is not possible, even in late spring, because weather in April and May can affect plowing progress significantly.

	Tioga Road		Glacier Point		Mariposa Grove
Year	Opened	Closed	Opened	Closed	Opened	Closed
1980	June 6	Dec 2
1981	May 15	Nov 12
1982	May 28	Nov 15
1983	June 29	Nov 11
1984	May 19	Nov 8
1985	May 8	Nov 12
1986	May 24	Nov 29
1987	May 2	Nov 13
1988	April 29	Nov 14
1989	May 12	Nov 24
1990	May 17	Nov 19
1991	May 26	Nov 14
1992	May 15	Nov 10
1993	June 3	Nov 24
1994	May 25	Nov 10
1995	June 30	Dec 11	July 1	Dec 11
1996	May 31	Nov 5	May 24	Nov 5
1997	June 13	Nov 12	May 22	Nov 12
1998	July 1	Nov 12	July 1	Nov 6
1999	May 28	Nov 23	May 28	Nov 23
2000	May 18	Nov 9	May 15	Nov 9
2001	May 12	Nov 11	May 15	?
2002	May 22	Nov 5	May 17	Nov 5
2003	May 31	Oct 31	May 31	Oct 31
2004	May 14	Oct 17	May 14	?
2005	June 24	Nov 25	May 25	?
2006	June 17	Nov 27	May 25	Nov 27
2007	May 11	Dec 6	May 4	Dec 6
2008	May 21	Oct 30	May 2	Dec 12
2009	May 19		May 5		April 17

Caltrans has a list of recent closing and opening dates for other passes in the Sierra Nevada.