You may use them anytime during Timberline's Winter Ski Season, normally mid-November through May 31, it can be redeemed for two day/night lift tickets for skiing at Timberline during the 2007/2008 winter season, excluding Saturdays and holiday periods: 11/22-11/25/07, 12/15-1/1/08, 1/14, 2/18/08.

For foot passengers/sightseers, the certificate is valid when lifts are operating, weather conditions permitting and prior to the certificate expiration date.