Best time to travel Myanmar is from October through March (which is high traveling season in Myanmar). Starting from October, the sky becomes clear. No more rain, no more heat. Myanmar local farmers finished their plantation works and it is time to harvest the crops. As well as it is time to celebrate for local farmers. In Myanmar celebrations appears as Festivals, Eg., Ananda Pagoda Festival in January and Shwezigon pagoda festival in November where the tourists can find the local farmers who come and pay visit to pagoda festival by bullock carts. If you choose the traveling date to travel to Myanmar from October through April, you may enjoy one of Myanmar festivals. It is also the right time to do trekking, hiking, Ballooning over Bagan, Leisure at the beach.
One condition, May to September (which is the shoulder season) will be fine with cheaper rate if the customers who want to avoid the mass of tourists.
The main destinations such as Bagan, Mandalay, Inle Lake, and Yangon can be visited the whole year round.