The two seasons in plain terms
Tanzania has a dry season (June–October) and a wet season split across two rainy periods — the long rains (March–May) and the short rains (November–December). January and February sit between the two wet periods: hot and dry in the north, with excellent wildlife in the southern parks.
Dry season (June–October): grass is short, water sources shrink, and animals concentrate in predictable places. This is the easiest time to spot wildlife. Roads are firm and accessible everywhere. The downside: every tourist in Tanzania is here too, especially in July and August. Prices peak sharply.
Short dry (January–March): the Serengeti's calving season fills the southern plains with newborn wildebeest. Predator activity is intense. Fewer tourists than peak season, better prices. Some northern roads are passable, some are not — check conditions before you go.
Long rains (April–May): heavy rain, some road closures, deeply discounted rates (30–50% off peak). Many operators run their best deals in this window. Wildlife is still present — animals don't leave Tanzania during the rains — but game-viewing requires patience. Not recommended for first-time visitors.
Short rains (November–December): brief afternoon showers, green landscapes, migratory birds in enormous numbers. A good compromise: better prices than peak season, lower crowds, and roads mostly passable.
Month-by-month breakdown
January – February The Serengeti's southern plains are where you want to be. Wildebeest calving peaks in February — up to 8,000 calves born per day — and cheetahs, lions, and hyenas hunt openly on short grass. Ngorongoro Crater is at its most photogenic. Hot but dry. One of the best-value windows for serious wildlife photography.
March The long rains begin around mid-March in the north. Southern Serengeti wildlife starts moving northward. Good window for Ruaha and Nyerere in the south, where rains arrive later. Prices start to soften.
April – May Long rains across most of Tanzania. Some tracks become impassable, especially in the Serengeti's western and central sections. Mahale Mountains and Gombe are accessible year-round and actually busier in April than peak season — chimps stay active in the rain. Hotels and lodges cut prices by 30–50%. Not for first-timers, but experienced safari-goers often prefer the solitude.
June The dry season begins. Wildebeest and zebra move through the western Serengeti corridor on their way north. Game drives become increasingly productive as vegetation drops. Crowds build through the month. Excellent time for the northern circuit.
July – August Peak season. The Great Migration river crossings happen in the Serengeti's northern Mara region — crocodile-filled crossings that are among the most dramatic wildlife events on earth. Every camp near the Mara River is full. Prices are highest of the year. Book 6–12 months in advance for the best properties. Despite the crowds, the wildlife justifies the cost if you plan carefully.
September – October The northern Mara crossings continue into September. Crowds thin from October as the rains approach. Wildlife is exceptional in all northern parks — animals are concentrated near water, vegetation is low, and game is easy to spot. Tarangire reaches its peak in October: elephant herds of 300+ animals, and the park is far less busy than the Serengeti.
November Short rains arrive, usually in the second half of the month. Migratory birds flood into Tanzania from Europe and the Middle East — 200+ species visible that are absent for the rest of the year. A very good time for birding. Wildebeest begin returning to the southern Serengeti. Prices drop noticeably.
December Short rains continue but are brief — typically afternoon showers that don't prevent morning game drives. Christmas and New Year see a brief price spike (equal to or above August rates). Otherwise, December is a solid mid-tier month: reasonable prices, short rains, and wildlife beginning to concentrate in the south again.
The Great Migration calendar
The migration is a year-round cycle — the herds never stop moving. What changes is where they are:
- January–March: Southern Serengeti (calving season)
- April–May: Central Serengeti (moving north through the long rains)
- June: Western Serengeti corridor (grumeti crossings)
- July–October: Northern Serengeti and Masai Mara (Mara river crossings)
- November–December: Returning south
The Mara river crossings are unpredictable — herds cross when they choose, not on schedule. Allow at least 3 nights near the Mara region in July–October to catch a crossing.
Which parks to prioritise by season
Dry season (June–October):
- Serengeti — migration crossings in the north
- Tarangire — best elephant concentration in Tanzania (September–October)
- Ngorongoro — year-round, but views across the crater floor are clearest in dry months
- Ruaha — excellent big game with almost no other visitors
Wet season / green season (November–May):
- Serengeti — southern plains for calving (January–March)
- Lake Manyara — flamingos and migratory birds flood the lake (November–April)
- Mahale Mountains — chimpanzee trekking is good year-round; green season means empty camps
- Nyerere National Park — boat safaris on the Rufiji River; best for the southern circuit in wet months when northern parks are difficult
Budget: how season affects cost
High season (July–August, Christmas–New Year) lodges cost 40–60% more than green season rates for equivalent quality. A lodge charging $350/night per person in green season may charge $550/night in August. Some properties close entirely in April–May and reopen in June.
The pattern that offers the best value: late June or September–October. Shoulder season pricing but dry-season wildlife. Serengeti is still excellent, the crowds have thinned, and Tarangire reaches its peak.
For budget comparison across the full year, use the Safarani safari cost calculator — it shows how park fees and accommodation ranges interact with your group size.