Iceland is a country of volcanoes, formed by the gradual pulling apart of the Eurasian and North American plate. These mountains are a ski tourers paradise, usually covered in snow from as early as October right through to May. The highest mountain in the country is a little over 2000m and skiing is possible right down to sea level around the coasts. They're very glaciated mountains, shaped by years of ice movement. This creates the common flat top mountain with steep sides. The northwestern fjords are flanked by lots of these mountains and they provide near endless touring opportunities. Starting from a 1500m peak and skiing right down to the sea is pretty unique.
As close to the term guaranteed snow as you can get. While the weather in Iceland is very highly changeable the mountains are covered in snow from late autumn until mid-late spring. However Iceland's sometimes brutal weather can have an effect on the snow conditions. They get a lot of winter storms bringing 100mph winds which can do its best to blow the snow off the mountain, often leaving very hard-packed snow or ice behind. Spring is often best, when the weather should be calmer and the snow has had all winter to build up. This snow lasts all summer in some places.