The Ice Castle, or Snow Fort, den released in December 2012. It is uncommonly seen due to the limited time in which it could be bought. It has the same build as the New Years Party 2013 den, with a few turrets added and flipped around the X-axis.
The Snow Fort Den is available when Jamaa are in the winter months. During this time you will have the chance to buy it for 5,000 Gems. It returned to Jamaa on January 9th, 2014. Jammers mostly only use it in Winter, even if they have it during the summer, since it is a winter-themed den.
The Snow Fort Den is a big ice fort. It has a frozen river running next to the den. There are two levels and a staircase connecting each level. It also includes a snowball fighting area outside. In the top-right corner, there is an ice blower (similar to the mud in Appondale) that gives your animal an arctic-blue ice covering when you stand into it. The Snow Fort Den wallpapers and flooring are ice-themed.