Between roughly July and October, over a million wildebeest and zebra are somewhere in the Mara-Serengeti ecosystem, and a good number of them end up at the Mara River at some point during those months. That is as far as any honest operator will commit. The crossing happens when it happens; the herds do not consult the calendar, and a river full of wildebeest one morning can be empty by the following afternoon.
What this trip does is maximise your odds: extra days at the river-adjacent conservancies, a guide in radio contact with others across the reserve, and enough flexibility in the daily schedule to move fast if word comes through.
Fees and rules in Kenya's national parks are set by the Kenya Wildlife Service.






