Hilchot Sheleg – Laws of Snow #3

Making a snowman
Q: Is it permissible to make a snowman on Shabbat?
A: Building a snowman is not temporary, since it is meant to last. One should therefore not build a snowman on Shabbat.

Eating snow
The blessing before eating snow is "She-ha-kol," and there is no blessing after eating it since one does not eat enough (ke-zayit – approximately the size of an olive) and one eats it slowly (like tea or coffee).