When to go to Kenya for a safari? The Great Migration, rains and seasons

Straddling the equator, Kenya has neither summer nor winter but two rainy seasons: the 'long rains' from late March to May — the heaviest, the ones that genuinely wreck the tracks — and the 'short rains' from November to mid-December, briefer and often limited to late-afternoon storms. Between them open two dry windows: June–October (the great dry season, cool and sometimes overcast in July) and January–February (hot, luminous, crystal-clear skies).

Altitude does the rest: Nairobi and the Masai Mara, at 1,600–1,900 metres, offer 22–26°C days and surprisingly chilly safari mornings (8–12°C, pack a fleece), while the Indian Ocean coast runs a humid 28–32°C all year. A single trip can thus combine a brisk dawn in the Mara with a swim at Diani Beach.

It's Africa's most famous rendezvous: between July and October, over a million wildebeest and hundreds of thousands of zebra up from Tanzania's Serengeti occupy the Masai Mara, with the celebrated Mara River crossings — crocodiles included — generally concentrated between mid-July and September. No crossing can be scheduled: the herds go when they go, and you may wait hours at the riverbank.

The season has its flip side: it's the absolute peak for crowds and prices (Mara entry at its high-season rate, lodges full months ahead), and the crossing points can draw dozens of vehicles. Science also reminds us this ecosystem is under strain: a study by Joseph Ogutu and co-authors published in 2011 in the Journal of Zoology, based on thirty years of aerial counts, documents the decline of most wild herbivore populations in the Mara region between 1977 and 2009, driven by agricultural expansion and fencing (available on Google Scholar: scholar.google.com/scholar?q=Ogutu+continuing+wildlife+population+declines+range+contraction+Mara+Kenya). Choosing the conservancies bordering the reserve — fewer vehicles, direct payments to Maasai communities — is both more pleasant and more useful.

Between the short rains and the long rains slots a short dry season, hot and luminous: January–February. Vegetation still green from the December rains makes the landscapes superb, newborns (gazelles, zebra, resident wildebeest) draw the predators, and clear skies deliver the year's best views of Kilimanjaro from Amboseli.

It's our recommendation for a first self-drive safari: dry, drivable tracks, far thinner crowds than August, mid-level prices, and abundant resident wildlife in the Mara even without the migration — lions, elephants, giraffes and cheetahs don't emigrate with the wildebeest. Only the coast is then at its hottest (a humid 32°C), best saved for the end of the day.

The long rains turn the tracks to greasy marl: the black cotton soil roads of the Mara and parts of Tsavo become impassable even in a 4x4, camps close, and daily storms hamper game viewing. If your only window falls in April–May, go for a trip with an experienced driver-guide, lodges reachable on good roads, and the driest parks (Samburu, northern Laikipia).

In exchange, it's the season of floor-level prices — up to half off at some lodges — and spectacularly green landscapes. The short rains of November to mid-December are far less punishing: late-afternoon storms, tracks that drain fast, empty parks. A genuine insider's option, especially for Amboseli and the Rift Valley lakes.

The Masai Mara lives to the migration's rhythm (July–October) but stays excellent year-round thanks to its resident wildlife. Amboseli peaks in the dry seasons (June–October and January–February), when elephants converge on the marshes and Kilimanjaro shows itself at dawn. The semi-arid northern parks — Samburu, Buffalo Springs — are workable almost all year, their wildlife packed along the Ewaso Ng'iro river in the dry months.

Tsavo East and West, vast and hotter, are best from June to October and in January–February; the Rift Valley lakes (Nakuru, Naivasha, Bogoria and its flamingos) are a safe bet year-round, November storms aside. Finally, the Swahili coast (Diani, Watamu, Lamu) is at its best from December to March and August to September — the April–May long rains hit hardest there too.