The list has evaluated all climbs on the mainland as well as those in the popular cycling holiday destinations of Mallorca and Tenerife. Click on the name of the climb to see the profile and more details, and let us know whether you agree with our choices in the comments below!
98) AbantosStarting from the royal city of San Lorenzo de El Escorial - this is the best climb in the Madrid region.
97) MoncayoThe best climb in the Zaragoza province.
96) Coll d'HonorA twisty ascent in Mallorca's Tramuntana Mountains, highly enjoyable and easily made into part of a longer route.
95) Mont CaroThis monster is the longest and most challenging climb in southern Catalonia.
94) Bordako TontorraThe decisive climb in recent editions of the San Sebastian Classic. This short, steep ascent may not be used for much longer following a series of controversial incidents.
93) La BonaiguaOne of Catalonia's great climbs is only partially let down by the amount of traffic on this important trans-Pyreneean road.
92) LeitariegosOvershadowed by other more famous climbs in this corner of Asturias; but Leitariegos is a long and scenic climb in its own right.
91) RocacorbaThis climb is loved by cyclists based in Girona - professionals and amateurs alike. It is not especially difficult or especially beautiful, but it is a very popular cycling climb.
90) PiedrafitaOne of the great climbs of the Camino de Santiago route; Piedrafita is a nice gentle ascent taking you into the region of Galicia.
88) SollubeOne of the mythical Basque mountains; Sollube is best climbed on the quiet and steep backroads from Bermeo.
85) ValdezcarayThe Rioja wine region's most famous climb is not among the most challenging in Spain, but is well worth a ride if you are in the area.
84) Cumbre del SolHome to a memorable stage finish in the 2015 Vuelta - Cumbre del Sol is worth climbing for the stunning views it offers over the Mediterranean coastline.
83) El PortaletOne of the finest climbs in the Spanish Pyrenees; Portalet is high, challenging and with beautiful scenery.
82) La QueseraThe only climb on the list from the sparsely populated La Mancha region; you will probably never find yourself nearby La Quesera, but if you do, then this should be number one on your list of climbs to do.
81) Mirador del FitoA regular Vuelta climb, Mirador del Fito is a short and sharp ascent from Loroñe, with the highlight being the incredible viewing platform at the summit.
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79) Collada TrevincaThis climbs to the border with the Galicia region (where it is known as Fonte da Cova) and is typical of the area - sparse and barren. However, it is also long and with some challenging gradients; giving it a certain appeal to cyclists.
78) Can CostaThis climb on Mallorca's classic coastal road is situated between the beautiful villages of Deia and Valldemossa. The scenery here is incredible, but it is a short ascent and best included as part of a longer route.
76) La ColladonaPopular with locals more than tourists; this climb in the heart of Asturias is a great training ride, with its moderate distance and gradients opening it up to cyclists of various abilities.
75) SobremuntForget Sa Calobra - this is Mallorca's hardest climb. The road surface is poor and the gradients are very steep at times - but if you want to take on the toughest that Mallorca has to offer, then you have to climb Sobremunt.
74) La RasaA pleasant climb in the Rioja wine region; La Rasa is steady and picturesque.
73) Collado EspinaA deceptively brutal climb in the Collados de Ason mountains. Collado Espina has numerous stretches in excess of 20% gradient on both of its sides.
72) Fuente DéAlthough it shot to fame for its role in Alberto Contador's 2012 Vuelta win; Fuente Dé is actually a very gentle climb. Fortunately that allows you to fully appreciate the scenery of the stunning Picos de Europa National Park.
71) LizarragaOne of Navarra's best climbs, Lizarraga is characterized by long hairpin bends which gradually climb a near vertical rock face.
68) ChirivillaAlthough a relatively unknown climb; Chirivilla is a thoroughly enjoyable ride. It is quiet, only moderately challenging and provides beautiful views of the surrounding Calderona Mountains.
67) Coll de PradellColl de Pradell is one of the toughest climbs in Catalonia; regardless of which side you tackle it from. It is fairly long and relentlessly steep at times.
66) La CobertoriaA regular Vuelta climb, La Corbertoria is short and steep from both of its two main sides. There are many great options to include it as part of a longer route.
64) Es GrauShort, easy and beautiful. Es Grau is one of the best climbs in southern Mallorca and can easily be included in longer routes.
63) La VansaThis Catalan climb finishes at a rather unattractive ski resort. However, like so often in cycling, it is the journey rather than the destination that makes it a really enjoyable ride.
62) Monte IgueldoOften the final descent in the San Sebastian Classic; Monte Igueldo is home to some of the finest coastal views in Spain; particularly the backdrop over San Sebastian - the 2016 European Captial of Culture.
61) Peña HincadaA scenic and moderately challenging climb in the south of the Rioja region. One of the most enjoyable ascents in this part of Spain.
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French side, but is still thoroughly enjoyable.
57) Coll de FemeniaA hugely popular cycling climb in Mallorca, the Coll de Femenia is quite short and gentle, but it is also the gateway to the highest part of the beautiful Tramuntana Mountains.
55) Mirador de ÉzaroOne of the stars of the Vuelta a España in recent years, Mirador de Ézaro is short and very steep. Often overlooked is the fact that it also provides incredible views of the rugged Galician coastline.
54) AlisasA classic cycling climb in the Cantabria region of northern Spain. It is not especially difficult nor especially long, but it is a lot of fun to ride from both sides.
52) Cruz de HierroThe signature climb of the Camino de Santiago. Cruz de Hierro is tougher and more scenic when started from Molinaseca (the opposite direction to the Camino); however, both sides offer fine views over the Montés de León.
50) Xorret de CatíA classic Vuelta climb, Xorret de Catí is best climbed from Castalla, where the steep gradients will test even the most experienced climbers.
49) PiedrasluengasAt times, the long and excruciatingly gentle Piedrasluengas can feel like a bit of a drag. However, all that is forgotten as the scenery opens up towards the top, offering some incredible views.
48) ArtesiagaBest climbed from Irurita, this is a lovely quiet climb in the Navarran Pyrenees.
46) El CordalOvershadowed by its near neighbour - Angliru, the Cordal is a tough little climb in its own right, particularly when tackled from Pola de Lena. The last 2km average over 11%.
45) Coll d'OrientA beautiful climb on the southern edge of Mallorca's Tramutana Mountains. Coll d'Orient is short and easy, but it is a stunning part of the island.
44) Coll de RatesFull of professional cyclists during the winter, Coll de Rates is fairly short and gentle, making it excellent terrain for training. There are nice views from here of the Mediterranean coast.
43) Pla de BeretBasically an extension to the Bonaigua pass in Catalonia, Pla de Beret has stunning scenery as it takes you very close to the border with France.
42) Port de LarrauThe French side of this climb is best known for effectively ending the career of Miguel Induraín. The Spanish side is significantly easier, but its beautiful Pyreneean scenery makes it a great route for cyclists that love to go uphill.
41) Monte OizMonte Oiz is the hardest road climb in the Basque Country and one of very few over 1,000m altitude. The ascent from Gernika is easy and gentle for the most part, before the surface deteriorates and gradients become relentlessly steep in the final 5km. Not one for the faint hearted.
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38) Coll de SollerHairpins! Hairpins! Hairpins! This short climb in the north of Mallorca has more hairpins than Alpe d'Huez on both sides. Make sure you have greased your headset before you attempt it and you will certainly have a lot of fun here.
37) Puerto de la SíaA beautiful climb in the Asón Mountains. It is essentially two climbs in one on the Cantabria side - first passing the Collado de Asón.
36) AzurkiPerhaps not one of the most famous Basque climbs, but undoubtedly one of the most enjoyable. Azurki is incredibly picturesque whichever side you attempt it from. For the brave, the climb out of Zestoa has several long sections above 15% gradient.
35) Collada LlomenaSomewhat overshadowed by the nearby Picos de Europa mountains; the Ponga Natural Park is also home to some incredible scenery - and climbing the Collada Llomena is the best way to see it.
34) Coll de PalOne of the highest climbs in Catalonia, the Coll de Pal is long and steady, with similar characteristics to a climb like Col du Tourmalet.
33) Puerto de PontónA beautiful climb in the Picos de Europa National Park, Puerto de Pontón is very gentle, making it accessible for cyclists of all abilities.
32) PanderruedaThe most spectacular part of the Panderrueda is the first few kilometres, as you climb the undulating slopes out from the Cares Gorge in Caín; this is another stunning climb in the Picos de Europa range.
31) El GarbíThe nearest significant climb to the city of Valencia is climbed by hundreds of cyclists every week. For the biggest challenge, attempt it via the village of Segart.
30) Ermita de AlbaOne of the stars of the 2015 Vuelta, the peaceful and stunning setting of Ermita de Alba belies its devilishly steep gradients.
29) Peña CabargaAnother popular Vuelta climb, Peña Cabarga is short and steep. It is highly recommend for the fine views of Santander from its slopes.
28) Puig MajorMallorca's longest and highest climb attracts tens of thousands of cyclists every year and takes you to the most spectacular part of the Tramuntana Mountains.
27) JaizkibelThe iconic climb of the San Sebastian Classic, Jaizkibel is not especially difficult, but it is important in cycling history. On a clear day it also provides great views out to the Bay of Biscay.
24) Pico del InglésMost cyclists visiting Tenerife limit themselves to Teide and the south of the island. However, this climb in the northern Añaga Mountains is as good as it gets. Stunning scenery throughout the winding ascent from both sides.
23) AitanaThe highest road climb in the Alicante province is normally closed to traffic as it is an airforce base. However, the road is opened to the public for cycling races (including the 2016 Vuelta) - and you should definitely take this opportunity to tackle it.
22) TagananaShort and steep; this climb in the north of Tenerife is not one for beginners. However, if you have the strength, the scenery is incredible.
21) Las PalomasThe best climb in Andalucia's Grazalema Mountains can be tackled from various sides. The most spectacular ascent begins from next to the picturesque lake in Zahara.
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17) ArrateThe most legendary Basque climb is short and sweet. At just 5km it is not a major challenge in itself; however, the climb is steeped in cycling history and nearly all the great riders have tackled its slopes.
16) Fuente del ChivoA spectacular climb in the Alto Campoo mountains; Fuente del Chivo was used in the 2015 Vuelta a España. Unfortunately it was shrouded in thick cloud that day, denying spectators the stunning views that this high mountain climb has to offer.
15) Alto del TornoPerhaps a surprise inclusion this high up the list; Alto del Torno is not especially well known (although it has featured recently in the Vuelta). The climb from Labra, however, is absolutely stunning and offers a delightful contrast to the nearby Picos de Europa mountains.
14) Lagunas de NeilaThe main climb of the Vuelta a Burgos is challenging and scenic, with several different sides for you to tackle.
13) Calar AltoAt well over 2,000m altitude, Calar Alto is one of Spain's highest ascents. Even though it is pretty much in the middle of nowhere there are four different routes to the top, all on wide perfectly paved roads. The more ambitious could do a long circle by combining it with Puerto de Velefique.
12) GamoniteiroSharing the same mountain as Angliru, Gamoniteiro is actually the higher of the two climbs. The first part of the ascent is shared with La Cobertoria, before a narrow road takes you into beautiful mountainous countryside. On a clear day you can easily see across to Oviedo and the coastal city of Gijón.
11) La FarraponaA newcomer to the Vuelta, La Farrapona has become an instant hit. It is a challenging climb amongst the spectacular scenery of the Somiedo Natural Park.
10) Picón del FrailePicón del Fraile is best climbed from the Cantabrian side. It is long and beautiful, with the area known as La Concha (The Shell) providing incredible views through the valley and across to the Picos de Europa mountains.
9) Sa CalobraMallorca's most famous climb is as good as its reputation suggests. It is of moderate length and difficulty compared with others in the top 10, but its snaking road is uniquely spectacular.
8) El TeideA regular haunt of professional cyclists doing blocks of altitude training; Teide can be climbed from many sides. All of them are long, tough an highly rewarding, with great scenery amidst the volcanic national park.
6) La CreuetaCatalonia's finest climb has scenery which would be more at home in the highest peaks of the French Pyrenees. A beautiful climb with very little traffic.
4) La CubillaKnown by some as the Asturian Galibier, we believe that La Cubilla may be even more enjoyable to climb than the Alpine great. Like Galibier, it is long, high and has stunning scenery; however, unlike Galibier, it also has virtually no traffic throughout its nearly 30km.
Granada, it has a whopping 2,700m of elevation gain. For the greatest challenge, tackle the climb via Haza Llanas.
2) AngliruArguably professional cycling's most infamous climb, Angliru is well known for its sustained steep gradients. It is less well known for its incredible scenery (probably because it always seems to be cloudy when the Vuelta visits!); with the steepness of the climb offering a unique perspective as you look back down the mountain.
Picos de Europa mountains. Lagos de Covadonga is nowadays used more than any other ascent in the Vuelta and rightly so. It is visually spectacular, culminating in the two large lakes at the top of the climb, but it is also sufficiently difficult to make it a worthwhile challenge to all cyclists.