Please follow the purchase flow below if you have a promo code.
Click here: https://reserve.altaparking.com/
Choose 'Reserve with New Parking Code' to add a new code to your account.
If you already have a code on your account choose the button that says 'Reserve with Existing Parking Code'.
After clicking that, your code(s) will appear below saying with a button that says 'Reserve'.
You can then choose the appropriate code (if you have more than one), and then 'Reserve' from there and it will land on the calendar and display your rates available based on the code associated.
Alta will release additional parking each Sunday at 3pm (Mountain Time) for the following weekend or holiday period
If the date you are looking at says 'Sold Out' please check back at those times to see more availability.
Or you can contact Park Alta directly for further assistance, altaparking@interstateparking.com