I would definitely recommend taking the Bernina Express regardless of the time of year. I prefer winter and the snow, but imagine it would be just as memorable (although more crowded) in the summer.

The Bernina Express is arguably even more "worth it" in winter than in summer, as the landscape transforms into a dramatic, high-altitude winter wonderland. As the train climbs to the Ospizio Bernina (2,253 meters), passengers are treated to panoramic views of frozen lakes, jagged snow-covered peaks, and the spectacular Morteratsch Glacier. The contrast between the bright red train and the pristine white snow makes for incredible photography. Because the train features massive floor-to-ceiling windows, you remain warm and comfortable while witnessing some of the most rugged terrain in the Alps. In 2026, winter remains a peak season for this UNESCO World Heritage route; however, it is a peer-to-peer recommendation to book your seats well in advance, as the panoramic carriages fill up quickly with skiers and sightseers. If you want the full experience, take the train all the way from Chur or St. Moritz down to Tirano, Italy, to see the dramatic transition from the snowy peaks to the sunnier, palm-fringed valleys of northern Italy.