Jon Snow Timeline & Summary

Jon joins Commander Mormont and two hundred Night's Watch brothers on the Great Ranging beyond the Wall.
The Night's Watch find several wildling villages abandoned.
Eventually, they make their way to the haunted forest and Craster's Keep.
Craster tells Mormont that King-Beyond-the-Wall Mance Rayder has gathered the wildlings at the Frostfangs.
One of Craster's daughter/wives, Gilly, begs Jon to take her with the Night's Watch—she fears her child will be born a boy, and Craster will give him to the "cold gods," but Jon refuses her request.
Mormont and the brothers camp at the Fist of the First Men and wait for Qhorin Halfhand and his men to meet up with them.
Qhorin and his men do just that: He convinces Mormont to send out three scouting parties and requests Jon to join him.
Jon and a ranger named Stonesnake attack a wildling sentry group; Jon spares the life of a wildling named Ygritte.
Qhorin, Jon, and their posse push on but turn back when they are discovered by a wildling warg.
Qhorin forces Jon to yield to the wildlings and become a double agent.
To make the ruse more believable, Qhorin attacks Jon and Jon kills him.
Ygritte vouches for Jon. Jon joins the wildlings.