Best time to visit Serengeti National Park is just good throughout the year, but certain areas are better at specific times. The Dry season (from late June to October) offers the best wildlife viewing in general – with the wildebeest migration as its absolute highlight. The timing of the migration varies every year (the best chance of seeing it is during June and July) while the wildebeest calving is from late January to February.
January-February for the wildebeest calving; June-September for general wildlife viewing with a chance of seeing the wildebeest crossing of the Grumeti River (June-July) or the Mara River (September)
Most of the year – July to March (The Serengeti will be crowded around the Seronera area)
April and May (Lower rated may apply)
June to October (Little to no rainfall)
March and April (Peak of Wet season)
More Fun, Safe and an Enjoyable Kilimanjaro Climbs
Surely the information above is so helpful and Serengeti is real an amazing place to be visited by everyone while in Tanzania. It is surely a beautiful place with quiet large number of wildlife.