COVID-19
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| Year | Date opened | Date closed |
|---|---|---|
| 2020 | August 13 | Oct. 12 |
| 2019 | June 9 | Oct. 7 |
| 2018 | June 21 | Oct. 28 |
| 2017 | June 29 | Oct. 9 |
| 2016 | June 23 | Oct. 14 |
| 2015 | May 14 | Nov. 1 |
| 2014 | July 1 | Oct. 23 |
| 2013 | July 1 | Sept. 30 |
| 2012 | July 24 | Oct. 16 |
| 2011 | *Aug. 5 (Only opened first mile to Heather Meadows visitor center.) | Oct. 26 |
| 2010 | July 30 | Oct. 25 |
| 2009 | July 14 | Sept. 29 |
| 2008 | July 18 | Oct. 6 |
| 2007 | July 28 | Sept. 27 |
| 2006 | July 27 | Oct. 24 |
| 2005 | June 29 | Oct. 3 |
| 2004 | June 30 | Oct. 18 |
| 2003 | July 15 | Oct. 10 |
| 2002 | Aug. 9 | data not available |
| 2001 | data not available | data not available |
| 2000 | data not available | data not available |
| 1999 | Never opened (world-record snowfall year) | data not available |
