The Passover was the major feast celebrated at the beginning of the Jewish year, Nisan 15, which falls in our month of March or April (Fitzmyer 1981:339–40). Only men were required to make the journey, so Mary’s presence shows her commitment (Preisker 1964:373). Jerusalem was eighty miles from Nazareth, so the trip would take three days. Though some have argued that women and children traveled separately from the men as a way to explain how Jesus got lost, there is no ancient text that describes this practice.
Bock, Darrell L. Luke. Downers Grove, IL: InterVarsity Press, 1994. Print. The IVP New Testament Commentary Series.