The sector matters as much as the month
The Serengeti has plains and wooded areas across a vast territory. A camp in the wrong place can mean hours on the tracks before any sightings. Ask where your guide plans to look for the herds.
Keep time in the park
If you arrive from Arusha by road, set aside several days for the whole circuit. Compare the nights in the park, the viewing hours and the distance to your next stop.