The queen stage of the 2013 Tirreno-Adriatico, the fourth stage saw the summit finish at Prati di Tivo for the second consecutive year, where Vincenzo Nibali soloed away to a sixteen-second victory after attacking with left to climb, en route to winning the race overall in the final individual time trial stage. From the start in Narni, the parcours steadily rose, with three categorised climbs as part of the itinerary; the Forca di Arrone and the Capannelle Pass were both ascented but were not major tests to the riders, as both had average gradients of lower than 5%, but this was the preparation to the climb to Prati di Tivo. The long climb reached a gradient of 12% at its lower slopes, but the gradient averaged 7.1% for the duration. There was also the second of the day's intermediate sprints during the climb, at Pietracamela, coming with just under remaining.