The Wildebeest Migration Timeline, Month by Month

Month-by-Month: Where the Herds Are

The Southern Calving Ground (January to March)

Early in the year the herds bunch up on the short-grass volcanic plains between the southern Serengeti and the Ndutu area of the Ngorongoro Conservation Area. There is a reason they pick this exact spot: volcanic ash blown off the Ngorongoro highlands has enriched the soil, and the short grass that grows here is unusually rich in the calcium and minerals a pregnant wildebeest needs. In January they settle roughly between Naabi Hill, the Gol Kopjes, and Lake Ndutu.

At the February peak, somewhere around 8,000 calves are dropped a day — an operator’s estimate rather than a hard census, but the scale is real, and so is what follows. Wildebeest give birth standing up, and the calves are on their feet and running within minutes, because the alternative is the lion prides, cheetahs, and hyenas working the edges of the plain. It is the most concentrated predator action of the whole year. You also get every other baby animal at once — zebra foals, gazelle fawns, warthog piglets, wobbly giraffes — all timed to the green flush.

Two practical things the glossy guides skip. First, this is one of the few parts of the Serengeti where off-road driving is allowed (in designated Ndutu areas), so a good guide can position you for light and angles you simply cannot get in the north — a gift for photographers. Second, because calving is about staying put rather than moving, February is actually more reliable to plan around than the famous crossing months. One catch: the balloon doesn’t fly over Ndutu — only the central Serengeti, a 90-minute pre-dawn transfer away — and the heavy March-into-April rains can turn the Ndutu tracks to soup, which is the window to avoid. If you are weighing this against other seasons, the best time to visit breaks it down.

The Move North (April to May)

As the southern grass burns off at the end of the long rains, the herds string into single-file columns that run for miles, pushing northwest through the central plains between the Moru Kopjes and the Seronera valley. This is the green shoulder season: you might cop a twenty-minute afternoon downpour, but the country turns emerald, the crowds thin out, and lodge rates drop.

It is also when the calves face their first water. The Mbalageti River, in the western reaches, is often the first river the young have to cross — an early endurance test most timelines never mention. And from mid-May the rut kicks in: males clash horns and carve out territory while the columns keep moving, a noisy, dusty spectacle that runs into early July.

The Western Corridor (June to July)

By June the herds press into the narrow Western Corridor toward their first real barrier, the Grumeti River. At the end of May the “mega-columns” pour in, and the pressure on the banks peaks in the first days of June.

Here is the honest part nobody puts in a brochure: the Grumeti crossing can be a non-event. In a dry year the river shrinks to disconnected pools, and the wildebeest simply walk across on dry ground without ever meeting a crocodile. When it does run, though, it is a very different show from the Mara — the banks are wooded, so the herds burst out of the trees straight into the water in a sudden reveal, and you are close enough to shoot it on a wide lens instead of a long one. The trade-off everyone loves: where a Mara crossing can draw 30 to 80 vehicles, the Grumeti’s banks see a handful, and inside the private concessions you might be one of two or three cars at the water. Inside the national park, Kirawira and Ndabaka are the main public spots to watch the herds gather. The western forests also hide black-and-white colobus monkeys you won’t find on the open plains. And if you are based in the centre, it is only about 50 km from Seronera, so the Grumeti works as a long day trip rather than a full relocation.

The Northern River Crossings (August to October)