The best times to visit Tanzania are December through March or June through October when the climate is mild, mostly dry and the game viewing is at its finest. The main rainy season typically lasts from April to May with a shorter wet season during November. These rainy seasons draw fewer crowds while fostering abundant vegetation for grazing species. February marks the calving season for mammals such as wildebeest, affording a front row seat to the newborns’ first steps and interactions.