The Wildebeests Migration Season in Tanzania comes every year from late or mid December running through March. This is basically the period when the Wildebeests herds in their hundreds of thousands groups converge at Ndutu Plains making up about the whole million plus Wildebeests herd spreading from the Ndutu Plains to the Southern Serengeti Plains. Why Ndutu Plains for Tanzania Safari Calving Season? The Ndutu Plains is a vast savannah plain located within the Ngorongoro Conservations which make up vast grazing plains for the wildebeests migration herds so they come here every year during that period; December to March for