Start, finish: Stage 4. Mieres - León
Distance: 63 km
Date: 29 April 1957
Stage finished after 63 km. because of the weather conditions. Originally the stage was planned to be 136 km, but because of a blizzard the finsih line was redrawn at Puente de Los Fieros at the beginning of the ascend of Puerto Pajares. Raphaël GEMINIANI becomes the winner ahead of Gastone NENCINI. The jury decides that none of the classements will be affected by the stage outcome.