What countries ski?
Countries don't ski, people do! That being said, you need a LOT
of snow to completely cover the ground so that people can ski. The
amount of precipitation (including snow) depends on a variety of
factors and especially latitude (thus, countries in the very North
and very South of the world) and elevation (countries with
mountains). As you can see, this doesn't really narrow down the
list much because even countries that are not near to the poles
have lots of elevated grounds. Some areas where people ski are
parts of the U.S., Canada, Switzerland, Russia, e.t.c.