When did Katniss fall in love with Peeta Mellark?

Answer 1

Peeta fell in love with Katniss when they were young, and Katniss didn't return the feelings. Peeta was in love with Katniss before the story started, and Katniss began to like him back during the "cave scene" near the middle of the first novel.

Answer 2

Peeta first found he loved Katniss when she sang the valley song in school.

Answer 3

It seem like during The Hunger Games in the first book, but like in real life, it took her a while to realize.