Yes, Scotland can be extremely crowded in the summer, particularly during the months of July and August. This is the peak season for the "Edinburgh Festivals," including the Fringe, which effectively doubles the city's population and fills every hotel within a 30-mile radius. Popular landmarks like the Isle of Skye (Fairy Pools), Glenfinnan Viaduct, and the North Coast 500 route also experience heavy congestion, with narrow single-track roads often becoming "bottlenecks." In 2026, a new trend called "Coolcations" is driving even more tourists to Scotland as they flee the extreme summer heatwaves of the Mediterranean. To avoid the worst of the 2026 crowds, savvy travelers are heading to "Alternative Highlands" like the Outer Hebrides or the Borders region, or visiting during the "shoulder" months of May and September. If you must visit in summer, the "pro-tip" is to book your accommodation at least 6–9 months in advance and visit the most famous sites at dawn or dusk to avoid the massive tour bus arrivals.