The migration is a circular, year-round ecosystem event, not a fixed calendar show. This guide maps where the herds usually are each month — Ndutu calving, Grumeti crossings, the dramatic July-October Mara River chaos, and the southward turn — and explains how to design a trip that maximises the right kind of action for your travel window.
What the migration really is
The migration is an ecological loop driven by rainfall, grass quality, and water access, involving 1.5 million wildebeest, 400,000 zebra, 12,000 eland, and 300,000 Thomson's and Grant's gazelles travelling an 800 km clockwise circuit through the shared Serengeti-Mara ecosystem.
Because rainfall shifts year-to-year, planning should be probability-based rather than fixed-date based. The animals follow weather, not calendars, and the so-called 'Great Migration' is happening every single day of the year somewhere in the system.
January to March: calving in the Ndutu short-grass plains
January herds are spread across the Serengeti plains and beginning to calve. February sees an enormous calving pulse — around 8,000 calves born per day — concentrated on the short-grass plains around Ndutu. Best bases: Seronera, Ndutu, or Kusini.
By March the heavy rains arrive and the herds begin shifting toward the central woodlands and the western corridor. Predator action is exceptional during calving because vulnerable newborns attract lions, cheetahs, and hyenas in close succession.
April to June: west and north toward Grumeti
April travel is challenging because of unpaved Serengeti roads in heavy rain — best for dedicated safari travellers comfortable with mud, low light, and dramatic skies. May sees the herds reaching the Grumeti River, where giant Nile crocodiles stage the season's first major crossings.
June is the start of the dry pulse north and east through the Grumeti Game Reserve and Ikorongo Game Controlled Area. Mobile camps along the Grumeti or in the western corridor put you at the right point of the loop.
July to October: Mara River drama in Kenya
July herds reach northern Serengeti and begin probing the Mara River. From late July through September, dramatic crossings of the Mara and Talek rivers in Kenya's Masai Mara are the most photographed wildlife event on the continent. By August the Mara plains are awash with wildebeest, predators are at peak activity, and short grass favours wildlife visibility.
September continues the spectacle on the Mara side, with returning crossings as herds yo-yo across the river chasing fresh grazing. October sees the herds beginning to drift south again as thunderclouds build over the eastern Serengeti and the Loliondo Game Controlled Area.
November to December: short rains and the southward turn
November brings the short rains, and the herds move quickly south through Loliondo toward the western edge of the Ngorongoro Conservation Area. New grass paints the southern plains, and wildebeest start arriving on the Ndutu short-grass plains again to begin the cycle.
December settles the migration on the southern plains. Some herds move into the Ngorongoro Crater, and zebras begin foaling. Best bases: Seronera, Ndutu, or mobile camps that follow the herds.
Dry-season vs green-season trade-offs
Dry season (June-October) pros: easier wildlife spotting, concentrated game near waterholes, dramatic Mara crossings, fewer mosquitoes and lower malaria risk, clear nights. Cons: busier reserve sectors, higher rates, cold early-morning drives.
Green season (November-May) pros: lower rates, easier camp availability, brilliant birding, lush photographic backgrounds, fewer vehicles. Cons: occasional muddy roads, more variable weather, and especially in April-May some camps may pause operations.
How we reduce disappointment risk
We design migration itineraries with flexible game-drive blocks and guide-led updates rather than promising specific crossing moments. Conservancy stays on the Mara side reduce vehicle crowding while keeping access to migration zones.
On the Serengeti side, mobile-camp itineraries that move with the herds outperform fixed-lodge stays for green-season and shoulder-season travel. We commonly pair a north-Serengeti or Mara block (for crossings) with a Ngorongoro or Tarangire block (for resident wildlife) to insure the trip against migration variability.
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