The Best Time to See the Great Migration

1.5 million wildebeest. One circle. No beginning, no end.

The Great Migration is not a once-a-year event you put on your calendar — it is a continuous, year-long movement across the Serengeti-Mara ecosystem, driven by the rains and the grass. What changes month to month is the drama. Calving season in January is as raw and emotionally powerful as the river crossings in August. The question is not whether to see the migration — it is what you want to witness when you are there.

This guide covers every month and what the migration looks like then.

The Migration Cycle — An Overview

The herds move in a rough clockwise loop through the Serengeti and into Kenya's Maasai Mara, following the rains and the new growth. The key numbers: roughly 1.5 million wildebeest, 300,000 zebra, and 200,000 gazelle. Two peaks define the calendar: the calving season from January through March, when up to 8,000 calves are born every day, and the river crossing season from June through October, when the herds plunge into the Grumeti and Mara rivers.

One note on geography: the famous Mara River crossing straddles the Tanzania-Kenya border. The herds cross into Kenya and back into Tanzania repeatedly. This guide focuses on the Tanzania side — less crowded, more space, and the entire crossing drama is visible from the Serengeti.

January

The herds settle on the short-grass plains of the southern Serengeti and the edge of the Ngorongoro Conservation Area near Ndutu. Calving season is beginning — vulnerable newborns across the plains, predator action already picking up as lion prides and hyena clans track the herds. Photography conditions are excellent: short grass, golden light, and a green landscape that makes the predator-prey drama stark and beautiful.

February

Peak calving. Up to 8,000 calves born in a single day across the Ndutu plains. The concentration of newborns draws every predator in the region — lions, cheetahs, hyenas, African wild dogs. The result is the most intense wildlife viewing of the year: calves taking their first steps while big cats prowl the periphery, the circle of life in full view. Mobile fly camps follow the herds in the NCA during this period, giving guests an intimate, close-to-the-herd experience.

March–April

The long rains arrive. The landscape turns vivid green and visitor numbers drop — which means lower prices and far fewer vehicles at sightings. The herds begin their slow push northwest, moving through the central Serengeti toward the Western Corridor. Leopard sightings in the Grumeti reserves are a particular highlight during these months. If you want the migration without the crowds, this is the window.

May

The herds mass in the Western Corridor and around the Grumeti River. River crossings begin — smaller and less crowded than the Mara, but still dramatic: crocodile ambushes, crossing chaos, and thousands of animals pushing through water. For photographers, May is underrated: extraordinary light, dramatic action, and a fraction of the vehicles you would find at a July crossing.

June

The Grumeti River crossings intensify in the northwest Serengeti. The herds are building toward the main event, massing at the banks of the Mara River and waiting for the signal to cross. River drama peaks here too: crocodiles, hippos, the tension of thousands of animals staring at water. Tip: get to Lamai and the northern Kogatende area by June — it means you are already in position when the herds decide to move in July.

July–August

Peak crossing season. The wildebeest pour into the Mara River — the iconic images, the wall of animals at the riverbank, the plunge into crocodile-infested water. July and August are the months most visitors picture when they think of the Great Migration. The Kenya side draws enormous crowds. On the Tanzania side, after the herds cross back south, the northern Serengeti and Lamai area are noticeably less crowded. Prices peak — book six or more months ahead for best camps.

September

The long wait at the Mara River continues. Crossings are ongoing throughout September as different segments of the mega-herd move back and forth. The northern Serengeti and Lamai Wedge remain the prime viewing areas. This is also the month when combining a safari with a Kilimanjaro climb makes the most sense — fly into the mountain, safari north, fly out of Arusha, and you have covered both of Tanzania's greatest wildlife experiences in a single trip. Our Kilimanjaro guide covers routes, preparation, and timing.

October–November

The short rains return and the herds begin their southward migration. The return crossing is less dramatic than the July–August plunge, but still significant — thousands of animals moving together with real purpose. October and November offer excellent value: prices drop from peak season, wildlife viewing remains strong, and the green landscape is beautiful. November in particular offers extraordinary photography conditions: dramatic skies, green plains, and far fewer vehicles than the August peak.

December

The herds are back in the southern Serengeti and NCA. The cycle is complete — calving season begins again within weeks. Christmas brings peak pricing and more families, but the December plains are genuinely spectacular: green, lush, full of newborns. If you are travelling with family over the holidays, this is a remarkable time to be here.