Best Time for a Mustang Nepal Bike Trip The best time to take a Mustang Nepal bike trip is in the spring months, March to May, and autumn months, September to November. These seasons offer good weather, clear skies and moderate temperatures that make it perfect to ride through the beautiful Mustang Valley. Spring brings colors to the region with blooms of flowers and autumn brings picturesque views of Himalayan peaks during minimal rainfall periods. The trails are dry and the roads are more in shape for these periods ensuring a smoother and safer journey. Avoid the monsoon season (June to August) due to heavy rains, which can make the roads slippery and risky. Winter (December to......See More