Best time to go Gorilla Trekking in Rwanda in Volcanoes National Park are the dry months however, Mountain Gorillas in Rwanda can be viewed throughout the year. Being on high demand Rwanda Gorilla permits for the months of July, August, September, October, December, January sell out very fast there fore need to be booked in advance.
Gorilla Trekking in Rwanda
https://www.katonatours.com/rwanda-gorilla-trekking/
https://www.katonatours.com/gorilla-tour-in-rwanda-1-day/
https://www.katonatours.com/rwanda-gorilla-adventure-karisoke-golden-monkeys-trekking-7-day/