From the AspenSnowmass website:
It looks like you have to book lodging through stayaspensnowmass.
Kids Ski Free
With more time on the slopes, your kids will become life-long skiers and riders. To encourage this new generation of winter enthusiasts, we have a special offer to get your kids on the mountains of Aspen Snowmass more often. And, truthfully, it’s too good to pass up!
Rent your kids equipment (ages 7 to 12) from Four Mountain Sports, and they’ll get a free lift ticket. Rent as often as you like and we’ll provide complimentary lift tickets for the same amount of days on their rental. Additionally, kids receive 30% off of Child Group Lessons with our Ski & Snowboard School when purchasing 7 or more days.
Skiing and riding more often on the latest equipment, and improving technique with a group lesson? It’s a sure-fire way to build up confidence on the slopes ... and possibly, enjoy the sport for a lifetime.This package is only available by calling one of our local vacation experts at 800.290.1326.
Book by December 1 for arrivals prior to February 28, 2016. Book by January 30 for arrivals after March 1, 2016.
Valid November 26, 2015 - April 17, 2016.
Blackout Dates: December 26, 2015 – January 1, 2016 & February 7-13, 2016.
Offer DetailsPackage must be booked with lodging through Stay Aspen Snowmass. Kids 7-12 receive a complimentary lift ticket with purchase of rental from Four Mountain Sports. Kids receive 30% off Child Group Lesson products when purchasing 7 or more days. Adult behavior does not impact Kids Ski Free eligibility. Promotion also valid on longer stays. All offers subject to availability at time of booking. Only available with participating properties; some properties may have blackout dates. Offer not valid on existing reservations. Two night minimum stay required.
Call and mention the "Kids Ski Free" when you call 800.290.1326, or e-mail firstname.lastname@example.org to have a customized quote sent to you via e-mail.
Also check out Very Important Kids Snowmass while you are here. VIK is designed to create daily programming for children and provides many options for families after the ski-day ends!