The phrase 'Great Migration' conjures a single dramatic image — wildebeest launching into a crocodile-filled river — but the reality is a continuous, year-round circuit that moves through Tanzania's Serengeti and Kenya's Masai Mara following the rains.
From July through October, over two million wildebeest and zebra typically concentrate in the northern Serengeti and Masai Mara, and this is when the famous Mara River crossings happen. If a crossing is the single image you want from your trip, this window — and specifically August and September — offers the best odds.
January through March, the herds are further south, calving on the short-grass plains of the southern Serengeti. This period isn't about crossings, but it delivers extraordinary predator action, as newborn calves draw lion, cheetah, and hyena in numbers.
April and May are the 'green season' — quieter, lusher, and considerably better value, though rain can affect road conditions in some conservancies. Wildlife is still present in strong numbers; you're simply trading crossing drama for solitude and lower rates.
Our guidance: if witnessing a river crossing is the priority, book July–October at least six months ahead, as camps along the Mara River sell out early. If you're more drawn to predator action and don't mind travelling south into Tanzania, the January–March calving season is an underrated alternative.
