If your plans change, your lift ticket is refundable (terms apply). Any unused days on your lift ticket are fully refundable until 5 PM MT on the last day of your ticket. For example, if you buy a ticket dated February 1st-5th, you have until 5pm MT/PST on February 5th to request a refund for any unused days on your ticket.
Refund requests received after 5 PM MT on the last day of your ticket will not be honored, except in certain circumstances (see terms for full details)