The best time to visit Lombardy as a cyclist is during the spring and autumn months, between April and June or September and October. During these times, the weather is generally mild, with comfortable temperatures and fewer crowds compared to the peak summer season. The spring months are ideal for exploring the lower altitude routes and cycling through the blossoming countryside, while autumn is perfect for tackling the challenging mountain passes and enjoying the fall foliage.

However, it’s worth noting that the weather in Lombardy can be unpredictable, and rain is possible at any time of the year. The winter months are generally too cold and snowy for cycling, while the summer months can be very hot and crowded. If you do plan to visit Lombardy during the summer months, it’s best to plan your rides early in the morning or in the late afternoon to avoid the heat and the busiest times on the roads.