The 2018 Skyrunner World Series was the 17th edition of the global skyrunning competition, Skyrunner World Series, organised by the International Skyrunning Federation from 2002.^[1]

In this edition, compared with 2017, the Sky Extreme and Sky Ultra races have been unified in a single category called Sky Extra. The calendar was announced by ISF in October 2017.^[2]

#	Date	Race	Distance	Vertical climb	Venue
1	30 April	Yading Skyrun	29 km	+2,345m	Yading, China
2	27 May	Maratòn Alpina Zegama-Aizkorri	42 km	+2,736m	Zegama, Spain
3	16 June	Livigno SkyMarathon	34 km	+2,500m	Livigno, Italy
4	23 June	Olympus Marathon	44 km	+3,200m	Dion, Greece
5	1 July	Buff Epic Trail 42K	42 km	+3,200m	Barruera, Spain
6	22 July	Dolomites SkyRace	22 km	+1,750m	Canazei, Italy
7	29 July	SkyRace Comapedrosa	21 km	+2,280m	Arinsal, Andorra
8	25 August	Matterhorn Ultraks Sky	49 km	+3,600m	Zermatt, Switzerland
9	1 September	The Rut 28K	28 km	+2,375m	Big Sky Resort, United States
10	13 October	Limone Extreme SkyRace	29 km	+2,500m	Limone sul Garda, Italy

#	Date	Race	Distance	Vertical climb	Venue
1	12 May	Transvulcania Ultramarathon	75 km	+4,350m	La Palma, Spain
2	2 June	Ultra SkyMarathon Madeira	55 km	+4,000m	Madeira Island, Portugal
3	7 July	High Trail Vanoise	70 km	+5,400m	Val d’Isère, France
4	4 August	Tromsø SkyRace	50 km	+4,600m	Tromsø, Norway
5	26 August	Trofeo Kima	52 km	+4,200m	Val Masino, Italy
6	16 September	Salomon Glen Coe Skyline	55 km	+4,750m	Kinlochleven, UK
7	29 September	Salomon Ultra Pirineu	110 km	+6,800m	Bagà, Spain
8	6 October	Pirin Ultra SkyRace	66 km	+4,200m	Bansko, Bulgaria

• Skyrunner World Series