Stage 4 of the 2025 Itzulia Basque Country will take place on .
The stage starts in Beasain and finishes in Markina-Xemein, starting at with an expected finish at (average speed of km/h).
The total distance of the stage is 169.9 km. The stage includes 7 categorized climb(s) and 2 intermediate sprint(s), and has a total elevation gain of 2569 m, and a total descent of -2686 m.
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The stage includes 7 categorized climb(s) and 2 intermediate sprint(s).
Asentzio is a KOM cat. 3 climb, which starts at 34.4 km (135.5 km to go) and ends at 44.1 km (125.8 km to go). It has total distance of 9.7 km, and an average gradient of 3.8%, going from 199 to 564 meters of altitude.
Muniketagane is a KOM cat. 3 climb, which starts at 69.5 km (100.4 km to go) and ends at 72.4 km (97.5 km to go). It has total distance of 2.9 km, and an average gradient of 7.2%, going from 123 to 333 meters of altitude.
Bizkaiko Begiratokia is a KOM cat. 3 climb, which starts at 78.9 km (91 km to go) and ends at 80.9 km (89 km to go). It has total distance of 2 km, and an average gradient of 4.3%, going from 342 to 429 meters of altitude.
Gontzagaraigana is a KOM cat. 3 climb, which starts at 85.3 km (84.6 km to go) and ends at 87.9 km (82 km to go). It has total distance of 2.6 km, and an average gradient of 6.4%, going from 195 to 359 meters of altitude.
Lekoitzegane is a KOM cat. 3 climb, which starts at 95.7 km (74.2 km to go) and ends at 99.1 km (70.8 km to go). It has total distance of 3.4 km, and an average gradient of 7.5%, going from 95 to 351 meters of altitude.
Milloi is a KOM cat. 3 climb, which starts at 114.1 km (55.8 km to go) and ends at 117.5 km (52.3 km to go). It has total distance of 3.5 km, and an average gradient of 3.9%, going from 27 to 165 meters of altitude.
Mijoa Auzoa is a Sprint at 129.6 km (40.3 km to go).
Elgoibar Sigma is a Sprint at 150.4 km (19.5 km to go).
Izua is a KOM cat. 1 climb, which starts at 155.3 km (14.6 km to go) and ends at 158.9 km (10.9 km to go). It has total distance of 3.7 km, and an average gradient of 9.4%, going from 194 to 541 meters of altitude.
The final 3 km for this stage starts at 166.9 km, has an average gradient of -0.9%, reaching 85 m of altitude.