| | Chinook Pass
SR 410 | Cayuse Pass
SR 123 | North Cascades
SR 20 |
| Year |
Opened |
Closed |
Opened |
Closed |
Opened |
Closed |
| 2012 |
May 25 |
Nov. 12 |
May 8 |
Nov. 12 |
May 10 |
|
| 2011 |
June 23 |
Nov. 11 |
May 26 |
Nov. 11 |
May 25 |
Nov. 21 |
| 2010 |
May 28 |
Nov. 16 |
April 30 |
Nov. 16 |
April 16 |
Dec. 1 |
| 2009 |
May 22 |
Nov. 8 |
May 15 |
Nov. 8 |
April 24 |
Nov. 17 |
| 2008 |
June 5 |
Dec. 15 |
May 23 |
Dec. 15 |
May 1 |
Dec. 15 |
| 2007 |
May 24 |
Nov. 29 |
Sept. 29 # |
Nov. 29 |
April 26 |
Dec. 4 |
| 2006 |
May 25 |
Nov. 12 |
Jun. 30 |
Nov. 12 |
May 1 |
Nov. 13 |
| 2005 |
Apr. 28 |
Oct. 25 |
Apr. 21 |
Nov. 4 |
Mar. 10 |
Nov. 3 |
| 2004 |
May 6 |
Dec. 7 |
Apr. 30 |
Dec. 6 |
Apr. 8 |
Dec. 13 |
| 2003 |
May 14 |
Nov. 17 |
Apr. 18 |
Nov. 18 |
Apr. 14 |
Oct 17 |
| 2002 |
May 31 |
Dec. 10 |
May 6 |
Dec. 12 |
May 7 |
Dec. 17 |
| 2001 |
May 10 |
Nov. 26 |
Apr. 20 |
Nov. 26 |
Mar. 22 |
Nov. 19 |
| 2000 |
May 18 |
Nov. 27 |
Apr. 20 |
Nov. 28 |
Mar. 30 |
Nov. 28 |
| 1999 |
Jul. 1 |
Nov. 30 |
Jun. 3 |
Nov. 30 |
May 5 |
Dec. 6 |
| 1998 |
May 20 |
Nov. 20 |
Apr. 25 |
Nov. 23 |
Apr. 2 |
Nov. 20 |
| 1997 |
Jun. 12 |
Nov. 19 |
May 23 |
Nov. 20 |
May 7 |
Dec. 16 |
| 1996 |
May 23 |
Nov. 16 |
Jun. 21 # |
Oct. 7 ## |
Apr. 24 |
Nov. 19 |
| 1995 |
Jun. 7 |
Nov. 7 |
May 24 |
Dec. 4 |
Apr. 28 |
Nov. 5 |
| 1994 |
May 27 * |
Oct. 31 |
May 23 * |
Oct. 31 |
Apr. 7 |
Oct. 31 |
| 1993 |
May 28 * |
Nov. 18 ** |
May 28 * |
Nov. 18 |
Mar. 24 |
Dec. 8 |
| 1992 |
May 8 |
Nov. 21 |
Mar. 30 |
Nov. 30 |
Apr. 9 |
Dec. 8 |
| 1991 |
May 24 |
Nov. 19 |
May 3 |
Dec. 7 |
May 2 |
Nov. 17 |
| 1990 |
May 17 |
Nov. 21 |
May 17 |
Nov. 24 |
Apr. 18 |
Nov. 12 |
| 1989 |
May 26 |
Nov. 28 |
May 1 |
Jan. 4, 1990 |
Apr. 21 |
Jan. 3, 1990 |
| 1988 |
May 12 |
Nov. 10 |
Apr. 15 |
Nov. 17 |
Apr. 20 |
Nov. 19 |
| 1987 |
May 13 |
Nov. 23 |
Apr. 3 |
Nov. 30 |
Apr. 15 |
Dec. 1 |
| 1986 |
May 22 |
Nov. 18 |
Apr. 10 |
Nov. 28 |
Apr. 11 |
Nov. 26 |
| 1985 |
May 22 |
Nov. 9 |
Apr. 19 |
Nov. 17 |
Apr. 12 |
Nov. 15 |
| 1984 |
May 24 |
Nov. 5 |
Apr. 6 |
Nov. 16 |
Apr. 4 |
Nov. 2 |
| 1983 |
May 25 |
Nov. 14 |
Apr. 7 |
Nov. 24 |
Apr. 20 |
Nov. 24 |
| 1982 |
Jun. 10 |
Nov. 16 |
Apr. 30 |
Dec. 2 |
May 6 |
Dec. 2 |
| 1981 |
Apr. 29 |
Nov. 20 |
Mar. 18 |
Nov. 30 |
Apr. 24 |
Nov. 30 |
| 1980 |
May 21 |
Nov. 17 |
Apr. 21 |
Dec. 4 |
Apr. 18 |
Nov. 27 |
| 1979 |
May 25 |
Nov. 24 |
Apr. 23 |
Jan. 8, 1980 |
Apr. 10 |
Dec. 15 |
| 1978 |
May 25 |
Nov. 18 |
Apr. 3 |
Dec. 10 |
Apr. 21 |
Dec. 11 |
| 1977 |
N/A |
Nov. 15 |
N/A |
Dec. 2 |
N/A |
Nov. 23 |
| 1976 |
Jun. 11 |
None |
May 14 |
None |
May 21 |
None |
| 1975 |
Jun. 13 |
Oct. 28 |
Apr. 29 |
Nov. 30 |
May 16 |
Nov. 24 |
| 1974 |
Jul. 12 |
Dec. 18 |
May 29 |
Dec. 30 |
Jun. 14 |
Nov. 21 |
| 1973 |
Apr. 5 |
Nov. 9 |
|
Dec. 12 |
Apr. 27 |
Nov. 21 |
| 1972 |
Jun. 23 |
Nov. 9 |
|
|
Sept. 2 |
Nov. 26 |
| 1971 |
Jun. 18 |
Nov. 1 |
|
|
|
|
| 1970 |
May 29 |
Nov. 11 |
|
|
|
|
| 1969 |
May 27 |
Dec. 10 |
|
|
|
|
| 1968 |
May 10 |
Nov. 22 |
|
|
|
|
| 1967 |
Jun. 3 |
Nov. 28 |
|
|
|
|
| 1966 |
May 26 |
Nov. 16 |
|
|
|
|
| 1965 |
May 28 |
Nov. 24 |
|
|
|
|
| 1964 |
Jun. 20 |
Nov. 22 |
|
|
|
|
| 1963 |
May 28 |
Nov. 7 |
|
|
|
|
| 1962 |
May 20 |
Nov. 25 |
|
|
|
|
| 1961 |
Jun. 6 |
Nov. 11 |
|
|
|
|
| 1960 |
May 25 |
Nov. 15 |
|
|
|
|
| 1959 |
May 22 |
Nov. 19 |
|
|
|
|
| 1958 |
May 24 |
Nov. 9 |
|
|
|
|
| 1957 |
May 10 |
Nov. 27 |
|
|
|
|
| 1956 |
Jun. 13 |
Nov. 16 |
|
|
|
|
| 1955 |
Jun. 6 |
Nov. 17 |
|
|
|
|
| 1954 |
Jun. 19 |
Dec. 5 |
|
|
|
|
| 1953 |
May 30 |
Nov. 21 |
|
|
|
|
| 1952 |
May 16 |
Dec. 4 |
|
|
|
|
| 1951 |
May 19 |
Nov. 11 |
|
|
|
|
| 1950 |
Jun. 7 |
Nov. 15 |
|
|
|
|
| 1949 |
May 27 |
Dec. 9 |
|
|
|
|
| 1948 |
Jun. 12 |
Nov. 3 |
|
|
|
|
| 1947 |
May 15 |
Nov. 5 |
|
|
|
|
| 1946 |
Jun. 27 |
Nov. 1 |
|
|
|
|
| 1945 |
Jun. 2 |
Nov. 9 |
|
|
|
|
| 1944 |
May 20 |
Nov. 23 |
|
|
|
|
| 1943 |
Jun. 18 |
Nov. 4 |
|
|
|
|
| 1942 |
May 3 |
Nov. 3 |
|
|
|
|
| 1941 |
Apr. 15 |
Dec. 15 |
|
|
|
|
| 1940 |
May 15 |
Nov. 8 |
|
|
|
|
| 1939 |
May 7 |
Dec. 15 |
|
|
|
|
| 1938 |
May 28 |
Nov. 16 |
|
|
|
|
| 1937 |
Jun. 1 |
Nov. 12 |
|
|
|
|
| 1936 |
May 23 |
Dec. 8 |
|
|
|
|
| 1935 |
May 21 |
Nov. 15 |
|
|
|
|
| * |
Due to Construction |
| ** |
SR 410 North of Chinook Pass Closed 11/1/93 Due to Construction |
| *** |
Temporary Closure Date |
| # |
Due to Winter Storm Damage |
| ## |
For Repair of Winter Storm Damage | |