Countries

Switzerland is literally a heaven, so anytime you go is the best time. But still basis what you want to do and the purpose, a little run though of the best time to visit Switzerland :

April to mid May and Aug – September are the period which should be preferred to visit Switzerland, since it is not very touristy and crowded (which is a real boon), weather is moderate and most of the excursions are open.

June-July are the busiest months. People with family and also few others due to their leave schedules prefer to travel during this time.

Oct – Nov & Jan – Mar is for Adventure junkies, skiers, etc. as this period is most suitable for them with snow covered swiss land.

So depending on your purpose and availability, you can pick your best time to visit Switzerland.