The migration
Ndutu: The Calving Plains Are Inside the NCA
Half a million wildebeest calves are born in about three weeks on plains that most people assume are in the Serengeti. They are not.
Check dates and availability ↗The Ndutu calving season, from NCAA and peer-reviewed sources
| Question | Answer | Source |
|---|---|---|
| Where is Ndutu? | Inside the Ngorongoro Conservation Area, on the edge of the southern Serengeti plains | NCAA |
| When do the herds arrive? | From the end of December | NCAA |
| When do they leave? | April, heading north again | NCAA |
| Best viewing months | Late February and March | NCAA FAQ |
| How many calves? | Nearly 500,000, within roughly three weeks | Calabrese et al., Scientific Reports, 2018 |
| Herd size passing through | Well over one million animals | UNESCO |
The plains are not in the national park
This is the single most useful correction on this page. The Ndutu plains, where the great migration calves, lie within the Ngorongoro Conservation Area — the NCAA says so on its own page, describing Ndutu as located in the conservation area on the outskirts of the southern Serengeti plains. UNESCO puts it slightly differently and confirms the same thing, noting that the herds calve on short-grass plains that straddle the conservation area and Serengeti National Park boundary. If you are planning around the calving season, your permits, rules and often your camps are Ngorongoro's, not the national park's.
Half a million calves in three weeks
The scale of the calving is difficult to grasp and it is properly documented. A 2018 paper in Scientific Reports on the Serengeti wildebeest records that the population displays mating and calving peaks resulting in the birth of nearly 500,000 calves within a roughly three-week period. That synchrony is the strategy: by flooding the plains with newborns in a single short window, the herd overwhelms the predators' capacity to take them. UNESCO records well over a million animals passing through the property on the migration. Nothing else in the mammal world happens on this scale in this compressed a time.
When to be there, without the exaggeration
The NCAA gives the season as running from the end of December, when the herds begin arriving from the north, through to April, when they start north again, and says that late February and March are the best months for seeing the migration. That is the reliable answer. Two figures widely circulated on safari-operator blogs are not: that February is the peak calving month, and that around eight thousand calves are born a day. Neither appears in the peer-reviewed literature or in NCAA's own material. Plan for late December to April, aim at late February and March, and treat precision beyond that as marketing.
Why the calving explains the January bump
Tanzania's arrivals figures for the conservation area show a clear secondary peak in January and February — 55,008 and 61,960 in 2025, well above the 18,220 of April — and this is what produces it. It is also why those months feel different from the August peak: visitors in the southern summer are distributed across the western plains rather than concentrated on the crater floor. The crater itself is genuinely quieter in January and February than in July and August, which means a calving-season trip can give you both the migration and a less crowded descent.
What Ndutu means for how you book
Ndutu sits well to the west of the crater, with its own airstrip and its own accommodation — the NCAA lists one lodge in the Ndutu area plus two tented camps. It is not a day trip from the rim. If the calving is your reason for travelling, build the itinerary around Ndutu and treat the crater as the addition, rather than the other way round. That inverts the usual structure of a Ngorongoro trip, and it is one more reason why the multi-day safaris that combine the conservation area with the Serengeti tend to be the products that actually fit what visitors want in these months.