What happened 

Shares of mountain resort giant Vail Resorts (MTN -1.13%) fell as much as 15.2% in trading Friday after the company announced weak results from the holiday season. Shares came off their 52-week low slightly but were still down 12.6% at 11:30 a.m. EST.

So what

Season-to-date total lift ticket revenue was up 12.2% from a year ago, ski school revenue rose 9.5%, and dining revenue was up 14.8% on a 16.9% rise in the number of skiers. But management said that the preholiday season from December 1 to December 21 was lower than anticipated as poor conditions and weaker-than-expected short-term bookings hit the company. 

Mountain resort development in the winter.

Image source: Getty Images.

Management also said that EBITDA for fiscal 2019 would be below the guidance given in September 2018. That guidance was for between $718 million and $750 million of EBITDA but assumed normal weather conditions.

Now what

Weather is always a risk factor for mountain resorts, and this year has once again been unusually warm. The good news is that Vail has transitioned its business to be focused on season-pass sales, which lock in season revenue before snowfall even starts. But if the warm weather continues in the mountains, we may see customers be a little less excited about buying a season pass in the coming years, which is the biggest long-term risk for the company.

Check out the latest Vail Resorts earnings call transcript.