On what day did Noah enter the Ark, according to Genesis?

According to Genesis, Noah entered the Ark on the 17th day of the second month.

Genesis 7:11–13 supplies the date and then describes Noah, his family, and the animals entering the Ark. The passage places the beginning of the Flood within the chronology of Noah’s six-hundredth year, giving the narrative a precise calendar marker.

This date should not be confused with the date on which the Ark came to rest. Genesis 8:4 gives a separate date for that later event: the 17th day of the seventh month. The two dates are five months apart within the story’s own calendar sequence.

Different religious traditions may calculate or commemorate Flood-related dates differently, but the answer here follows the wording of Genesis. The question concerns the entry into the Ark, not the start of rain alone or the eventual landing.