Although the times of the migration are never guaranteed, generally the action starts in the Masai Mara around July. The huge herds of wildebeest make their way from the neighbouring Serengeti and as they navigate obstacles in their path (think of those dramatic river crossing images) it is quite a special sight.
This continues until about September when they head back down south and so the annual cycle continues.
With the exception of Mid April through to May, when heavy rains can cause problems, the rest of the year still offers a fantastic safari experience.
Don’t forget November time, when although it is likely you will see short sharp rain showers, it’s a period of re-growth and new life. Many animals make the most of the plentiful grazing and use it as an ideal time to have their young.