The third classification was the mountains classification. On each of the road stages there were classified climbs on the route. The first riders to the top of the climb were awarded points in the mountains classification. For most of the climbs, the first four riders won points, with five, three, two and one points respectively. More points were awarded for the two most difficult climbs of the race. These were the summit finish to Monte Terminillo on stage 5 and the Poggio San Romualdo on stage 4. On these climbs, the winner won 15 points in the classification, with the next six riders also winning points. The rider with the most points was awarded the green jersey.