The Dolomites by bike: passes, order and the weather window

The Dolomites were inscribed on the UNESCO World Heritage list in 2009 as nine separate mountain systems, and for a cyclist the useful fact about them is that the passes are close together. In the Alps proper you climb for twenty-five kilometres, descend for thirty and call it a day. Here the climbs are five to twelve kilometres each and the passes sit next to one another, so a normal day has four or five summits in it and the question is not whether you can climb, but in what order and starting when.

This is the geography, the numbers, and the one thing that shortens most people's Dolomites trip: the afternoon weather.

The Sella group, and the four passes around it

The Sella massif is a block of rock with a road round it, and the road crosses four passes. The Sellaronda Bike Day organiser gives the loop as 53 km with roughly 1,650 m of climbing, and recommends riding it anticlockwise. The Maratona dles Dolomites organiser publishes each climb's length and gradient as ridden on its course:

Four passes, 53 km, and the longest single climb is nine kilometres. Nothing on the loop is steep. Pordoi from Arabba is the one with the famous hairpins and the one most people find hardest, mainly because it comes second and it is the longest. Sella is short and the steepest of the four. Gardena, from the Sella side, is barely a climb at all.

The Sellaronda Bike Day closes all four passes to motor traffic from 09:00 to 16:00 twice a year; in 2026 the dates are 6 June and 12 September. There is no registration, no fee and no timing, helmets are compulsory and the highway code still applies. If you can arrange your trip around one of those two days, do. The rest of the summer the same roads carry a steady stream of motorbikes and coaches, and the descents in particular are far more pleasant without them.

The outer ring: Giau, Falzarego, Valparola, Fedaia

East and south of the Sella the passes get longer and one of them gets properly hard.

Passo Giau, 2,236 m, is the climb the Maratona is built around: 9.9 km at an average of 9.3% for 922 m of gain, from Selva di Cadore. It is the only climb in the region where you need gearing you would choose for the Alps, and the only one where riding at a sensible power from the bottom rather than the top matters in the way it does on Ventoux.

Passo Valparola, 2,200 m, is 11.5 km at 5.8% from the Badia side and joins Passo Falzarego just below the summit; from Cortina you climb Falzarego and then tack on the last kilometre to Valparola. Both are steady, wide and well surfaced, and either makes a sensible first Dolomites pass.

Passo Fedaia, below the Marmolada glacier, is not on the Maratona course and is the one that catches people. The final kilometres above Malga Ciapela are in our experience the steepest sustained road in the region. Ride it early in the trip, not at the end of a big day.

Tre Cime: the dead end worth the detour

The road to Rifugio Auronzo under the Tre Cime di Lavaredo is a roughly six-kilometre asphalt toll road from near Lake Antorno above Misurina, ending at 2,333 m. The Auronzo–Misurina tourist consortium gives its season as generally late May to late October, weather permitting, and since summer 2025 cars need to book online in advance. Cyclists ride up past the toll point. It is short, very steep at the top and completely exposed, and it is a there-and-back, so you will descend what you climbed. It is also the most spectacular thirty minutes of cycling in the Dolomites, which is why we mention it despite it being a cul-de-sac.

Order matters more than fitness

Because the passes are clustered, most Dolomites days are loops with three to five summits, and the sequence changes the day completely. A few principles from our own trips:

• Hardest climb first. If Giau is on the menu, it goes at the start, when you are fresh and the road is empty. Giau at 15:00 after Falzarego and Valparola is where trips go wrong.
• Descend the road you know. Pordoi's hairpins are fine to descend; the Sella side of Gardena is fine. Fedaia's steep side is not somewhere to find out your brakes are hot.
• Sellaronda anticlockwise. The organiser recommends it and it is right: Campolongo, Pordoi, Sella, Gardena puts the two longer climbs in the first half.
• Finish near the car. The last pass of the day should drop you into your valley, not someone else's. A 25 km valley ride home after five passes is where you get cold and stupid.

The Route Builder is useful here because it shows the profile of a loop before you commit to it, and any saved loop can be ridden in Moveee Indoor on a smart trainer, which is the honest way to find out what Giau at 9.3% feels like before you fly. Our guide to planning mountain-pass routes covers the general method.

The weather window

Summer weather in the Dolomites has a rhythm: clear mornings, cloud building over the peaks from late morning, and thunderstorms in the afternoon. The Province of Bolzano runs its own weather service with mountain forecasts, a live lightning map and a stated reliability percentage on each forecast, and it is worth checking every morning rather than relying on a phone app that thinks the whole valley is one place. A storm at 2,200 m is not rain; it is hail, a temperature drop of ten degrees and lightning on an exposed road with nowhere to shelter.

The practical rule is the one the locals use: on the road by seven, off the high passes by two. A five-pass day started at nine can be fine, and it can also leave you on top of Giau in a storm at three. Start early, and if the forecast reliability is low, plan a route you can cut short.

Outside summer the constraint is snow, and in our experience any pass here can close without warning when the weather turns, in any month. The passes around the Sella tend to stay open through the winter because they are ski links; in our experience the higher outer passes, Giau, Fedaia and Valparola among them, close for the season somewhere between October and December and reopen between April and June, depending entirely on snow. The road authorities publish live status rather than dates: Veneto Strade for the Belluno side, the Province of Bolzano's traffic centre for South Tyrol and Viaggiare in Trentino for Trentino. Check them, not a calendar, and not a blog, including this one.

When to go and where to base yourself

Late June to mid-September is the window, and the first half of July is the crowded part because the Maratona dles Dolomites runs then: on 5 July in 2026, 138 km and 4,230 m over seven passes, with entries drawn by lottery. The roads are closed for the event and full for the week around it.

Corvara or Arabba puts you on the Sellaronda with Valparola and Giau within reach; both are ski villages with a lot of beds. Canazei on the Trentino side gives Fedaia and Pordoi from the door. Cortina is the base for Giau, Falzarego and Tre Cime, and the furthest from the Sella. If you have a week, two bases are better than one; three days each side of the Sella and you will have ridden everything in this post. For the logistics of getting a bike there and moving between bases, our trip-planning guide is the place to start.

The Dolomites are the easiest big mountains in Europe to ride well, because the climbs are short enough to pace and close enough to chain. They are also the easiest to ride badly, for exactly the same reason. Start early and put the hard pass first.