The Great Migration is not a single event — it’s a continuous, year-round movement of roughly 1.5 million wildebeest and several hundred thousand zebra following the rains across the Serengeti-Mara ecosystem. There’s no single “best month” to see it; there’s a best month to see whatever part of the migration interests you most; the calving season, a river crossing, or the quieter grazing months in between. Here’s how the cycle actually unfolds.
January to March: Calving season in the southern Serengeti. The herds settle onto the short-grass plains around Ndutu and the southern Serengeti, where an estimated 500,000 calves are born within a few concentrated weeks, mostly in late January and February. This is also when predator action is at its most dramatic, since newborn calves draw in lion, cheetah and hyena from across the plains. It’s a superb time to visit if you want big cat sightings alongside the migration itself, and the plains are green and photogenic.
April to May: The long rains and the move north. As the short-grass plains dry out, the herds begin drifting north and west through the central Serengeti. This is the quietest period for tourism generally — accommodation is cheaper and parks are less crowded — but the migration itself is more dispersed and harder to predict, so it’s a better fit for travellers prioritising value and solitude over guaranteed migration drama.
June to July: The push toward the Grumeti River. The herds move through the western corridor, and this is when the first river crossings happen — at the Grumeti River, smaller and less famous than the Mara crossings but still a genuine spectacle, with fewer vehicles present. By late July, the front of the migration typically reaches the northern Serengeti and begins pressing toward the Mara River.
August to October: Mara River crossings — the classic image. This is what most people picture when they imagine the Great Migration: thousands of wildebeest gathering at the riverbank, hesitating, then plunging across water that holds some of the largest Nile crocodiles in Africa. Crossings happen unpredictably — sometimes multiple times a day, sometimes not for several days — so this period rewards multi-day stays near the river rather than a single flying visit. During these months the herds move between the northern Serengeti and Kenya’s Maasai Mara, often crossing the international border itself more than once.
November to December: The short rains and the return south. As the short rains begin, the herds turn back south, moving back through the eastern and central Serengeti toward the calving grounds, completing the annual cycle. This period is less structured around one dramatic event but offers good general game viewing with fewer other visitors around.
So which month should you actually book? If a river crossing is the single image you want, aim for August through early October and plan to spend at least three nights near the Mara River (on either the Tanzanian or Kenyan side) rather than a single overnight, since crossings can’t be scheduled. If you’d rather see newborn calves and concentrated predator action, late January through February in the southern Serengeti is a strong, slightly less crowded alternative. And if budget matters more than timing a specific event, April/May and November offer real cost savings with still-solid game viewing, just without the migration as the headline act.
One planning note worth knowing: because the migration moves between Tanzania and Kenya, some of the best crossing viewing happens right at the border, and a single-country itinerary can mean missing the herds if they’ve moved to the other side that week. Our own Great Migration and cross-border itineraries are built with this in mind — positioned flexibly and adjusted close to departure based on where the herds actually are, rather than locked to a fixed park months in advance.
