In late July and the first half of August they will typically be in the northern part of Serengeti, at the Mara River and Kenya’s Masai Mara, where one may be lucky enough to witness the famed river crossings. In September or early October are when the herds start to move back down to the southern plains along the eastern sections of the park.

Theoretically, you can see the Great Migration at any time. The Migration doesn’t really have a start or endpoint but is rather a circular motion going clockwise through Northern Tanzania and Southern Kenya throughout the year.  Popular times are calving season or the times for Mara River crossing.