Decide what you want to see
Basically, you can do a safari in Tanzania all year long. There are enough national parks and lots of animals to see, including the Big 5. But there is also the Great Migration, one of the top reasons to do a safari trip in Northern Tanzania. We did ours in the beginning of July in anticipation of the Great Migration. But this is also the high season so everything is relatively more expensive. You can find our 10-day itinerary in this link.