To do anything you’re going to need Bombs so be sure to purchase some. Also, if you want a Piece of Heart down the road you’ll need the Swamp Title Deed so work your way up to it before heading to Snowhead.
Go to the north of Termina Field and up the snowy ramps to see two giant boulders. Shoot the icicle above to make it fall and gain access to the Mountain Passage.
Fight your way past the Tektites and up to four large snowballs blocking your path. Bomb them to get through then continue to the Mountain Village.
The Mountain Smithy
Near the building you’ll find an Owl Statue, be sure to activate it. There is only one building here, it’s the Mountain Smithy and it serves no purpose right now. Continue east to the Goron Village.