Victor plans to return home to Geneva, Switzerland, after an extended period in Ingolstadt, Germany. His father had sent him away to the prominent university there, and he attended classes for a while, but his stay had been extended for some time as he worked on creating a human being and then as he languished, ill, under the care of his best friend, Henry Clerval, upon the completion of his experiment. Henry nurses Victor back to health, a process that takes almost another year, and it isn't until he receives a letter from his father telling him of the murder of William, Victor's youngest brother, that he finally resolves to return home. When he does arrive in Geneva, he finds his family mourning the loss of William and the accusation of Justine, a close family friend, for that murder.
At the beginning of Chapter 6 Victor is beginning to come out of his illness and the exhuastion brought on by the creation of his "monster." He is feeling better and Clerval gives him a letter from Elizabeth. On page 45 of my edition the narrator says,
"Summer passed away in these occupations, and my return to Geneva was fixed for the latter end of autum, but being delayed by several accidents, winter and snow arrived, the roads were deemed impassable, and my journey was retarded until the ensuing spring."
I must note that the link in enotes indicates that this happens in chapter 5, but the first time Victor mentions or plans to go home after leaving is in chapter 6 after his recovery.