Kenya is an East African country, 580,367 km² with population of 55 million. The country occupies the famous African Great Rift Valley region, bordered by Ethiopia and South Sudan (north), Somalia (east), Tanzania (south), Uganda (west), and Lake Victoria. Kenya has 536 km of Indian Ocean coastline (east) plus extensive interior wildlife habitat. Kenya is the famous home of the Great Rift Valley, the famous Mount Kenya (Africa's second-highest peak at 5,199 m), and the famous "cradle of humanity" — extensive hominid fossil discoveries at the Turkana Basin in northern Kenya have been crucial to understanding human evolution. The country was a British colony from 1895-1963 (known as British East Africa) and gained independence under the famous Jomo Kenyatta on December 12, 1963. Kenya is the famous origin of the Swahili language and culture, and the famous Kenyan distance runners (the Kalenjin tribe from Kenya's Rift Valley produces a disproportionate share of the world's elite middle and long-distance runners).
Major destinations include the famous Maasai Mara National Reserve (the famous Kenyan portion of the Serengeti ecosystem — the famous Mara River crossings happen here in July-September during the Great Migration), Amboseli National Park (the famous park with iconic Mount Kilimanjaro backdrop visible from inside Kenya — extensive elephant populations and the famous "Tim" tusker), Tsavo East and West National Parks (Kenya's largest park system at 21,812 km² combined — the famous "red elephants" colored by Tsavo's red soil and the famous Mzima Springs), the famous Samburu National Reserve (with the famous "Samburu Special Five" — Grevy's zebra, reticulated giraffe, gerenuk, beisa oryx, and Somali ostrich, all northern Kenya specialties), Lake Nakuru National Park (the famous flamingo-pink soda lake — though flamingo numbers vary year to year), Nairobi (the capital — population 5 million metropolitan, with the famous Nairobi National Park containing wildlife within the city limits, the famous David Sheldrick Elephant Orphanage, the famous Giraffe Centre, and the famous Karen Blixen Museum at the "Out of Africa" author's former coffee farm), the famous Kenyan Coast (with Mombasa — Kenya's second-largest city with extensive Swahili-Arab cultural heritage, Diani Beach — repeatedly ranked among Africa's top beaches, Watamu and Malindi, and the famous Lamu Island UNESCO World Heritage Old Town), Mount Kenya National Park (UNESCO World Heritage — the famous second-highest peak in Africa), the famous Lake Turkana (the world's largest desert lake), the famous Meru National Park (with extensive wildlife and the "Born Free" lion story location), Hell's Gate National Park (the famous walking-safari park with extensive Maasai cultural integration), and the famous Aberdare National Park (with extensive mountain forest and the famous Treetops Hotel where Princess Elizabeth famously learned of her father's death and her ascension as Queen Elizabeth II in 1952).
Kenya is the eastern partner to Tanzania in the Great Migration. Kenya's Maasai Mara fills with wildebeest July-September. Outside this iconic event, Kenya has world-class year-round game viewing plus a Swahili coast that operates on its own monsoon calendar.
Quick verdict
Best for the Maasai Mara crossings: Late July through early October. The Great Migration's most dramatic weeks.
Best for general Kenya safari (Amboseli, Tsavo, Samburu): June-October and December-February.
Best for the coast (Mombasa, Diani, Lamu): December-February and June-October.
Best for budget travelers: Late March and November. Lower rates outside long and short rains peaks.
Avoid if you can: April-May (long rains, many roads impassable, lodges close).
Long dry season (June to October): peak safari season
This is when Kenya delivers its iconic safari experience. The Mara is dry, grass is short, animals concentrate at water sources, and the climate is comfortable. Daytime 22-26 °C in the Mara, cool mornings, almost no rain. Game drives at dawn and dusk are the most productive of the year.
The Great Migration arrives in the Maasai Mara typically in mid-to-late July. The famous Mara River crossings — wildebeest leaping into croc-filled waters in dense columns — happen primarily August through September, with crossings sometimes continuing into early October. Camps in the Mara Triangle and along the river book 8-12 months ahead for August-September peak weeks.
Amboseli National Park (famous for elephants against Kilimanjaro views) is in its best season — dust raised by herds catches the light, Kili is most reliably visible in clear dry season air. Tsavo, Samburu, and Meru are similarly at their peak.
The coast (Mombasa, Diani, Watamu, Malindi, Lamu) is in its dry season. The kaskazi monsoon winds (June-October) are northeast trades — cool, reliable, calmer waters. Sea temperatures 24-25 °C. This is also Kenya's main school holiday season in July and August.
Short rains (November to early December): the shoulder
The "short rains" arrive in November as afternoon thunderstorms — typically not all-day downpours. Crowds drop sharply after the peak migration weeks. Prices ease from peak season. The Mara herds have begun moving south back to Tanzania.
This is one of the underrated periods for Kenya safari. Wildlife viewing remains excellent. The plains are starting to green up from the rains. Birdwatching improves as migrants arrive.
Mid-December through early January sees Christmas-New Year tourism — Kenyan and East African school holidays, plus international holiday travelers. Hotel rates in the Mara and on the coast spike for the holiday weeks. Book 4+ months ahead for Christmas-New Year.
Hot dry season (January to early March): the second peak
January and February are excellent. The grasslands are green from short rains, animals have dispersed but are easily found, weather is warm and dry. Daytime in the Mara around 26-30 °C; cool mornings.
This is the calving season for some plains species — newborn impalas, gazelles, and topis appear in dramatic numbers, drawing predators. Many travelers find this the best non-migration time for safari.
The coast is in its hot season — daytime 30-33 °C with humidity. Beach holidays peak. Hotels are full of European and South African travelers escaping winter.
Lake Nakuru's famous flamingos are present in this period (numbers vary year to year due to lake chemistry changes).
Long rains (mid-March to May): mostly avoided
The "long rains" arrive in late March or April and continue through May. Many camps close from mid-April through late May. Roads in the parks become difficult in many areas. The famous black-cotton soil of the Mara turns to deep mud.
April-May travelers can find significantly discounted rates and minimal crowds, but the safari experience is compromised. Some specialty travelers (birders, photographers seeking dramatic skies) still visit during these months. Most should avoid.
The coast is also wet — heavy rain, occasional cyclonic activity offshore, many beach hotels reducing operations. Snorkeling and diving visibility drops.
The Great Migration calendar (Kenya specifics)
The Maasai Mara receives the migrating herds for approximately 3-4 months of the year. Approximate timing:
July: First herds arriving from Tanzania.
Late July - August: Peak crossings of the Mara River.
September: Herds dispersed across the Mara ecosystem.
October: Herds beginning to move south. Crossings sometimes occurring in reverse.
November onward: Herds in Tanzania for the southern Serengeti calving cycle.
The exact timing varies year to year based on rainfall patterns. Local guides have current information.
Regional safari summary
Maasai Mara: Best August-September for crossings. Excellent year-round for general game viewing.
Amboseli: Best June-October and January-February. Famous for elephants against Kilimanjaro.
Tsavo East and West: Best June-October. Largest park system in Kenya.
Samburu: Best June-October. Unique northern wildlife (reticulated giraffe, Grevy's zebra, beisa oryx).
Lake Nakuru: Variable based on water level. Flamingo numbers fluctuate.
Laikipia: Best June-October. Private conservancies with rhinos.
Meru: Best June-October. Less crowded than the famous parks.
Coastal specifics
Kenya's coast operates on a monsoon calendar:
Kaskazi monsoon (June-October): Cooler, dry, reliable. Best season for combining safari with beach.
Short rains (November-early December): Some afternoon showers, mostly sunny mornings.
Hot dry (December-March): Hot and humid. Peak European tourism.
Long rains (April-May): Wet. Many businesses reduce operations.
Festivals and events
Lamu Cultural Festival (late November). Maralal Camel Derby (August). Madaraka Day (June 1). Mashujaa Day (October 20). Jamhuri Day (December 12). Lewa Marathon (June). Easter holidays (April).
Verdict by traveler type
First-time safari traveler wanting the Migration: August or September.
First-time safari traveler not focused on Migration: July or January.
Beach holiday on the Kenyan coast: December-February or June-October.
Combined safari + beach: July-October. Both regions in their dry seasons.
Photographer: August for crossings, January-February for calving drama.
Birdwatcher: November-March when migrants are present.
Budget traveler: Late March or November. Shoulder rates.
Family with kids: December-January (warm weather, school holidays compatible) or July-August.
Bottom line
Kenya's biggest single decision is whether to time your trip around the Maasai Mara crossings. If yes, plan for August-September and book 8+ months ahead. If general safari is enough, the dry season (June-October) and the post-rains period (January-February) both deliver excellent experiences with fewer crowds and lower prices. Avoid April-May entirely unless price is your only concern.