What episode(s) do Naruto's friends find out he holds the Kyuubi..?

its never really said but i think tsunade told sakura and the orichumaru told sasuke. Then first time they saw the charka was when they faced haku which would be like episode 20 or around there

Yup,

link

they all find out while narutos training it spreads throughout his friends i know for a fact they know by then