The best time to visit Holland, North Rhine, Germany, is during the spring (April to May) or early autumn (September to October) for pleasant weather and fewer crowds.
During spring, the countryside comes alive with blooming flowers, particularly the famous tulip fields. Temperatures are mild, typically ranging from 10°C to 20°C, making it ideal for exploring the region's towns and cycling through the scenic landscapes. Keukenhof Gardens, though technically in the Netherlands, is a major draw for visitors to this cross-border region during this period.
Early autumn offers similarly comfortable temperatures, usually between 12°C and 18°C, and the vibrant colours of the changing leaves add to the scenery. This season is superb for those who enjoy hiking or visiting vineyards in nearby regions without the peak summer tourist numbers. You'll also find local harvest festivals occurring, providing a good opportunity to experience local culture.
While summer (June to August) brings the warmest weather, often above 20°C, it's also the busiest and most expensive time to visit.