The Migration moves through a predictable annual cycle but the timing of the river crossings is impossible to predict more than a few days out. The two best windows are January–February (calving in the south) and August–September (crossings in the north).
Every year, around 1.5 million wildebeest, 200,000 zebra, and 300,000 Thomson's gazelle move in a giant clockwise loop through the Serengeti and Maasai Mara ecosystems. This is the Great Migration — the largest terrestrial mammal movement on Earth, and the single biggest reason most people come to East Africa on safari.
The Migration is also one of the most misunderstood safari experiences. People book trips for 'the Migration' without realising that the herds are only in the Mara for about 3 months of the year. Or they arrive during the river-crossing season expecting guaranteed crossings, when in reality the crossings depend on weather, grass conditions, and a dozen other variables that no one can predict more than a week or two out.
The herds move on a roughly annual cycle, but the exact timing shifts by 2–4 weeks each year depending on rainfall. Here's the typical pattern:
| Month | Where the herds are | What you're seeing |
|---|---|---|
| January | Southern Serengeti (Ndutu area) | Calving begins mid-January, 8,000 calves/day at peak |
| February | Southern Serengeti | Calving continues, predator action peaks |
| March | Moving north through central Serengeti | Large columns moving through the central plains |
| April | Central and western Serengeti | Long rains, dramatic skies, fewer visitors |
| May | Central and western Serengeti | Herds regrouping before the push north |
| June | Central and western Serengeti | Mating season — dramatic territorial behaviour |
| July | Western corridor → northern Serengeti | First herds cross the Grumeti River |
| August | Northern Serengeti / Mara border | Mara River crossings begin |
| September | Maasai Mara (Kenya) | Peak crossing season, herds spread across the Mara plains |
| October | Maasai Mara | Herds begin drifting back south, last crossings possible |
| November | Moving south through eastern Serengeti | Short rains, lush and green |
| December | Southern Serengeti (Ndutu) | Herds arriving back, building up to calving season |
These are typical patterns. In a wet year the herds stall, in a dry year they move fast. Don't book a fixed calendar and expect the wildlife to obey.
Up to 500,000 calves are born in a 3–4 week window, mostly in the Ndutu area. Predators are concentrated, the action is non-stop, and the photographic opportunities are unmatched. Lighter crowds than the August peak. Lower camp rates.
The classic Migration experience — thousands of wildebeest throwing themselves into the Mara River while crocodiles wait below. Dramatic, chaotic, and the most-photographed wildlife event on Earth. Heaviest crowds and highest prices.
Calving and crossings are very different photo subjects. Calving is intimate, predator-heavy, and works well with shorter lenses. Crossings are wide-angle drama and need telephoto reach (200mm minimum, 400mm ideal). If photography is the priority, plan for the subject you actually want to shoot.
You can see the herds moving through the central Serengeti in March — huge columns, dramatic skies, fewer visitors — but you will not see a river crossing. Crossings happen in July–October only.
The Mara. Stay in a conservancy camp for the best experience (off-road driving allowed, fewer vehicles). Plan 4+ nights during August–September to maximise your chance of seeing a crossing.
The herds are in the Maasai Mara from late July through October, with August and September the peak months for river crossings. The timing shifts by 2–4 weeks each year depending on the rains.
In 2026, a 7-night private Migration safari in the Mara costs $5,500–$10,000 per person in the conservancies. A 10-night Tanzania + Mara combined Migration safari is $9,000–$16,000 per person.
For most safari-goers, yes. The Migration is the single most concentrated wildlife event on the planet. Even a partial sighting (a vast herd spread across the plains, no crossing) is one of the great travel experiences.
Yes, and it's often better value. The herds are in the southern Serengeti for calving in Jan–Feb, and the northern Serengeti for crossings in Aug–Sep. Tanzania's camp rates are often lower than the Mara's, and you avoid the Mara's crowds.
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