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Stage 4 of the 2025 Tour de Suisse was a mountain stage that took place on .
The stage started in Heiden and finished in Piuro, starting at with an expected finish at (average speed of 40 km/h).
The total distance of the stage was 192.6 km. The stage included 2 categorized climb(s) and 1 intermediate sprint(s), and had a total elevation gain of 2821 m, and a total descent of -2826 m.
The stage included 2 categorized climb(s) and 1 intermediate sprint(s).
Sufers is a KOM cat. 3 climb, which starts at 125.4 km (67.2 km to go) and ends at 129.2 km (63.4 km to go). It has total distance of 3.8 km, and an average gradient of 6.8%, going from 1100 to 1357 meters of altitude.
Splügenpass is a KOM cat. 1 climb, which starts at 136.8 km (55.8 km to go) and ends at 145.7 km (46.9 km to go). It has total distance of 8.9 km, and an average gradient of 7.3%, going from 1463 to 2117 meters of altitude.
Tissot KM is a Bonus sprint at 137.1 km (55.6 km to go).
Tissot KM is a Bonus sprint at 138 km (54.6 km to go).
React sprint is a Sprint at 183.8 km (8.8 km to go).
The final 3 km for this stage starts at 189.6 km, has an average gradient of 2.4%, reaching 411 m of altitude.