The great wildebeest migration is not a single event but a continuous, year-round journey, over 1.5 million wildebeest alongside hundreds of thousands of zebra and gazelle moving in a roughly clockwise loop across the vast Serengeti-Mara ecosystem in search of fresh grazing. Understanding exactly where the herds are each month is the single most important factor in planning a migration-focused safari. This guide breaks the migration down month by month.
January-February: Calving season in the southern plains
The scale of the annual journey
Across the full year, the migrating herds cover a truly staggering distance, often cited at around 800 kilometres in their complete clockwise loop through the Serengeti-Mara ecosystem, though the exact figure varies with each year's specific rainfall patterns and resulting grazing conditions. This constant movement is driven by an evolved survival strategy: by never remaining in one place long enough to fully deplete the available grazing, the herds sustain grassland productivity across the entire ecosystem, benefiting not just themselves but the countless other herbivore species sharing the same land. Understanding this scale helps explain why witnessing even a single phase of the migration — whether calving season or a river crossing — represents just one chapter in an extraordinary, continuous annual epic.
The herds gather on the short-grass plains of the southern Serengeti, particularly around the Ndutu area, for calving season — up to 8,000 wildebeest calves born daily during this remarkable window. This concentration of vulnerable newborns draws intense predator activity, making this an outstanding, if underrated, time for dramatic lion and cheetah action alongside the calving spectacle itself.
March-May: The long rains and movement north
As the long rains begin, the herds start moving north and west from the southern plains through the central Serengeti, spreading across a wider area as fresh grass emerges. This period offers lower visitor numbers and reduced rates, with wildlife still abundant though less concentrated than during calving season or the later river crossings.
June: The western corridor
By June, the herds typically reach the western corridor, approaching the Grumeti River, where the first significant river crossings of the year occur, complete with the dramatic tension of massive Nile crocodiles waiting in the water. This period offers a preview of the more famous Mara River crossings later in the year, often with considerably fewer vehicles present.
July-August: Moving toward the Mara River
The herds continue north, approaching and beginning to cross the Mara River into Kenya's Masai Mara, marking the start of the migration's most famous and dramatic phase. Crossings can begin as early as late June in some years, with the exact timing varying based on rainfall patterns further south.
September-October: Peak Mara River crossings
This is peak migration season, with the herds spread across the Masai Mara and dramatic river crossings occurring regularly at established crossing points along the Mara River. This period draws the highest visitor numbers and rates of the year, given the near-guaranteed spectacle on offer, though booking well in advance is essential given the demand.
November: The return journey begins
As the short rains arrive, the herds begin their journey back south into the Serengeti, retracing their route as fresh grazing opens up further south ahead of the coming calving season. Crossings continue into early November in some years, gradually tapering as the bulk of the herd moves south.
December: Back toward the southern plains
By December, most of the herd has returned to the southern Serengeti plains, completing the annual cycle just ahead of the January calving season, and the loop begins again. This period offers good, if less concentrated, wildlife viewing as the herds settle into their southern range.
Choosing your migration month
For dramatic river crossings, target July through October. For calving season drama and predator action, target late January through February. For lower costs and quieter parks with still-excellent wildlife viewing, consider March through May or November. No month delivers "no migration," since the herds are always somewhere within the ecosystem — the real planning question is which specific phase of the migration you most want to witness.
Predators that follow the migration
The migration's movement shapes far more than just the herbivores themselves, drawing resident and, in some cases, semi-nomadic predator populations to follow the concentrated food source across the ecosystem. Lion prides adjust their territories seasonally around the herds' presence, while cheetah and hyena similarly benefit from the abundance of vulnerable young and weakened stragglers accompanying such vast moving herds. This predator-prey dynamic is part of what makes migration-season game viewing so consistently dramatic, since the sheer density of both predators and prey in a single area produces far more frequent and visible interactions than would occur outside this concentrated seasonal window.
Kenya versus Tanzania for migration viewing
Because the migration moves across both countries, timing matters more than country choice. Roughly July to October, the herds are typically in Kenya's Masai Mara; from November through June, they are generally within Tanzania's Serengeti-Ngorongoro ecosystem, including the dramatic calving season. See our Kenya versus Tanzania guide for the wider comparison between these two countries.
Why the migration follows this specific pattern
The migration's movement is driven entirely by rainfall and the resulting availability of fresh, nutrient-rich grass, with the herds following an instinctive, evolved response to seasonal weather patterns across the ecosystem rather than any fixed calendar. This is why exact timing shifts somewhat from year to year depending on when and where rain actually falls, and why experienced guides and safari planners track current conditions closely rather than relying purely on historical averages when advising clients on the best timing for a specific visit. Understanding this rainfall-driven logic also explains why the same general pattern — south for calving, north through the dry season, back south again — repeats reliably year after year despite the natural variation in exact dates.
What a river crossing actually looks like in person
For those who have never witnessed one, a river crossing is simultaneously thrilling and difficult to watch unfold. Herds gather in increasingly agitated numbers along the riverbank, sometimes for hours, before the first animals commit to entering the water, triggering a chain reaction as thousands follow within minutes. Nile crocodiles wait in the water, and the current itself claims a share of animals each season, making the spectacle a genuinely raw demonstration of nature's scale and stakes rather than a tidy, choreographed event. Crossings can happen at any time of day and are never guaranteed at a specific location, so patient guides who read herd behaviour and communicate by radio between vehicles offer the best chance of witnessing one.
Frequently asked questions
Is the migration guaranteed to be visible during any specific month? The herds' exact location shifts year to year with rainfall patterns, so while general seasonal patterns hold reliably, exact timing always carries some natural variability.
What is the single best month for photographers? August and September for dramatic river crossings, or late January and February for the softer, greener light and drama of calving season.
Do I need to book far in advance for peak migration months? Yes, six months to a year ahead is advisable for July through October travel, given the intense demand for camps near active crossing points.
Can I see the migration outside these peak months? Yes, resident wildlife remains excellent throughout the ecosystem year-round, even when the migrating herds specifically are elsewhere in their annual cycle.
How many days should I allow to maximise my chances of seeing a crossing? Three to four nights near an active crossing point during peak season meaningfully improves your odds, since crossings do not happen daily at every location and a short one- or two-night stay can mean missing the action entirely.
Does the migration ever skip a year or behave completely differently? The overall pattern has held reliably for as long as records exist, though exact timing and specific crossing locations do shift meaningfully with each year's particular rainfall, meaning no two migration seasons are ever quite identical in their details.
Is it worth visiting multiple times to see different phases? Many dedicated safari travellers do exactly this, returning across different years or trips specifically to witness calving season, river crossings and the quieter transitional months, since each phase offers a genuinely distinct experience of the same remarkable natural cycle.
Do other animals migrate alongside the wildebeest? Yes, large numbers of zebra and Thomson's gazelle move with the main herd, following much the same route and timing, adding further scale and diversity to the overall spectacle.
Is a hot air balloon safari a good way to view the migration? Yes, a dawn balloon flight during migration season offers a spectacular aerial perspective on the scale of the herds spread across the landscape, complementing ground-level game drives beautifully.
Should I plan my whole trip around one specific migration phase? For most travellers, yes — choosing a single priority, whether calving season or river crossings, and building the itinerary around that specific window tends to produce a more focused and satisfying experience than trying to chase multiple phases within one trip.
Want your safari timed to witness a specific phase of the great migration? Contact our team and we will position your itinerary exactly where the herds will be.