Strada dell’Assietta / Colle delle Finestre – A detailed look


Readers of this blog will know that I am a huge fan of high altitude, unpaved alpine climbs. Quiet, challenging, beautiful. Perhaps the best concentration in the Alps can be found in northern Piemonte near Bardonecchia/Susa. Colle delle Sommeiller, Monte Chaberton, Monte Jafferau, etc. And the fabulous network of old military roads around and including Strada dell’Assietta / Colle delle Finestre.

If you’re only here for details of the 2018 Giro climb of Colle delle Finestre see here for a detailed view of the climb – the ride then goes much higher.

Last week I managed my 4th ride involving all or parts of Strada dell’Assietta. This post will try and detail this network and give you five ride ideas. All challenging, all on unpaved roads, all super quiet, and all spectacular.

Below you will find:

  1. Strada dell’Assietta explained
  2. Colle delle Finestre explained
  3. Five Ride Ideas

This will be a long post and I’ll often refer to the coloured routes and landmarks on the map below.

1. Stada dell’Assietta (SP173) Explained

The Strada dell’Assietta refers to the Strada Provinciale 173 (SP173) – the red route on the above map. It is roughly 35 kilometres long, running from Sestriere to Pian dell’Alpe (just below Colle delle Finestre). While this high altitude ridge has been of military importance since the 1700’s, the current road and most of the fortifications were built/began in the late 1800’s with additions leading into both World Wars.

In 1747, the Battle of Assietta was fought at altitude here during the War of the Austrian Succession. The Piedmontese were forced to spread their forces protecting 13 passes, but successively repelled the French invaders inflicting over 5000 casualties (3700 killed including 7 French generals). This great Savoy-Piedmontese victory is still celebrated every July 19th with costumed ceremonies at the colle.

Broadly speaking, it can be divided into 3 sections:

A. Sestriere to Col Basset

This 6 kilometre stretch climbs from Sestriere at 2050 metres to Col Basset at 2460 metres – roughly 7%. This is a wonderful little climb full of hairpins and views.

Strdaa dell’Assietta from Sestriere, just below Col Basset

From Col Basset it is possible to cycle the steep couple of kilometres to the summit of Mont Fraiteve at 2702 metres (marked on map).

B. Col Basset to Colle dell’Assietta

The heart of Strada dell’Assietta, this middle 17 kilometre stretch is a ridge road between Col Basset (2460m) and Colle dell’Assietta (2472m). Sometimes flat, sometimes up/down, it traverses several colles (see map), and passes lots of old military installations (forts, bunkers, etc). Amazing.

The Strada dell’Assietta is closed to motorised traffic on Wednesdays and Saturdays during the summer. Very nice. While it never has too much traffic, these days eliminate the dust from the ever present groups of motor-cyclists and trek company jeeps.


C. Colle dell’Assietta to Pian dell’Alpe

This 11 kilometre stretch descends from Colle dell’Assietta (2472m) to Pian dell’Alpe (1950m). It includes a flattish cliff stretch in the middle and some superb hairpins down.

2. Colle dell Finestre Explained

Broadly, there are three parts to Colle delle Finestre (SP172).

The Famous North Side

Dark green on the map, this is one of the legendary cycling climbs in Italy appearing in the 2005, 2011, and 2015 Giro d’Italia. It’s a beast of a climb, one of the toughest in the Alps. But the grade is steady. It’s almost always either side of 9%. No respites, but few crazy steep ramps either.

Forte delle Finestre above the colle

The lesser known south side

Light Green on the map, the south side of Finestre begins paved. But a couple of kilometres down, the official SP172 actually leaves the current paved main road and again becomes an unpaved cliff road descending 1000 metres to Depot (the lower half is again well paved).

The south, unfamous side, of SP172 Colle delle Finestre

Strada Militare delle Finestre – Gran Serin

The yellow route, this is one of the true highlights of the region. This 13 kilometre, slightly crazy, ultra high stretch of old military road is always closed to traffic. It starts exactly at Colle dell’Assietta (2472m) climbs past Forte Gran Serin and heads higher to just under 2800 metres, before descending through fantastic hairpins/mountains to the main road just below Colle delle Finestre. The best.

Descending Strada Militare Gran Serin to Colle delle Finestre
3. Five Rides

#1 Strada dell’Assietta & Strada Militare Colle delle Finestre from Sauze d’Oulx

This incredible 91 kilometre loop starts from the ski station at Sauze d’Oulx. It’s a 1000 metres of climbing on a fun Assietta access road (purple on map) just to reach Col Basset and the Strada dell’Assietta. The route then rides Strada dell’Assietta until Colle dell’Assietta turning higher onto the Strada Militare Colle delle Finestre, finally returning to the start by riding Strada dell’Assietta from Pian dell’Alpe until Col Basset.

This link provides a detailed report with map and far more photos than you likely want including a gallery of all the col signs :).

OK, I am actually heading in other direction (down)

#2 Strada dell’Assietta via Parco Naturale Gran Bosco

The brown route on map, this amazing climb on “smooth as Wimbledon” unpaved roads (closed to cars) climbs 1400 metres – much through the woods of the Parco Naturale Gran Bosco – to join Strada del’Assietta. It also includes a detour up Monte Gran Costa to a fort at 2615 metres, high above Assietta. Finally, it descends via an old Strada dei Cannoni trail. As good as it gets. Map and full details here.

Parco Naturale Gran Bosco
Monte Gran Costa

#3 Colle delle Finestre, Colle dell’Assietta, and Above

This route climbs the famous side of Colle delle Finestre, joins Strada dell’Assietta until Colle dell’Assietta, finally looping back on the high yellow Strada Militare delle Finestre – Gran Serin. Hard work but so rewarding. Map and full details here.

Colle delle Finetre, just below Colle

#4 Full Strada dell’Assietta

This loop starts in Sestriere and rides the entire Strada dell’Assietta, it then descends the less famous (light green) side of Colle delle Finestre (it also includes a detour up to Mont Fraiteve – 2702m). Finally, it climbs back to Sestriere – much of the way on unpaved trails – although the main road is possible (and much faster). No link to this as this was my recent ride. So here is the map of the route:

#5 Forte Gran Serin via Frais

Yes, I am always “route planning.” I have have never done the pink route on the map but it looks awesome. EDIT: I rode this remarkable climb in 2017 – see here. Almost 2000 metres of climb to reach Forte Gran Serin from the valley below. My understanding is that this is unpaved, maybe occasionally even trails, steep (especially last few kms), but ride-able. A project for us all!

Forte Gran Serin
Final Thoughts

More and more in recent years I have searched out high unpaved climbs. The solitude and beauty of these roads is something tough to experience on a road bike. I just can’t recommend enough the Strada dell’Assietta and all the route options in this region.


Happiest while cycling uphill.


  1. Hi Will,

    The last year we ride the Finestre in road bike and Jafferau in mountain bike. I’m from Martigny in Swiss/Wallis at the start of Grand St Bernard, so we have a lot of great ride, but Jafferau was really incredible !

    This year we are back at end of august to ride Someiller, Jafferau again and the max possible of Assietta.

    Thank you for all your post, we found a lot of ideas and informations, real great job !


  2. Will,
    Thanks for the really informative post about the Strada dell Assietta. It helps a LOT for me to try and meet up with my crazy OZ dude thats doing his mind numbing challenge. Might have to throw a Spot Tracker on in case things get a bit ugly up there!
    I’ve pretty much sorted the exact route based on your advice, so all your help has been fantastic. Just got to hope the weather gods are kind on the 23rd!!

    Cheers mate.


    • Hello Will,
      Thanks for making me notice the Assietta northern route (Assietta to Finestre via Gran Serin). What a mindblowing experience. Did the route from Sestriere to Finestre (north route) and back to Sestriere (the traditional route).
      Keep climbing and inspiring people like me with your posts.
      Dirk Mulder (NL)

  3. Hi,

    Thank you for another great post!

    Which way do you think is better to make a loop from Colle delle Finestre in ride no. 3? Clockwise like you did or anticlockwise?


    • Hi Dan, Either could work, but I prefer the way I did it . clockwise. Because 1) that part of Assietta is very fun to climb, and I think the Monte Serin yellow route is more ride-able climbing from Colle dell’Assietta.

  4. These are some of the roads I ride every year. Your photos and descriptions take me straight back there. Definitely going to do the nivolet that you recommend. Thank you!

  5. Hey Will,

    Thanks for such a detailed overview on the Strada Dell Assietta. I’ve been planning a bike trail ride for some time now so it really helps a noob like me to know what to expect!

  6. Charles Warner on

    Hi Will, Is the Stada della Assietta open to bicycles before June 1? I see that it is closed to all other vehicles before that. I plan on riding Colle delle Finestre to Assietta towards Sestriere then descending down the paved road back to the south climb of Finestre back to where I begin near Susa. Thanks, Charles

    • Charles, the main issue is snow. May is early to expect the snow to be melted especially the highest stuff like Colle dell’Assietta at almost 2500m. And I suppose given the road is unpaved it is more difficult to plow. So I don’t think you’ll find the road fenced off or anything, but likely very difficult to pass over.

  7. Pingback: Strada dell’Assietta – An “Easier” Way

  8. Hey Will,

    Great information! We are looking at making a trip from the U.S. this year and your info is perfect. What is the best time of year to come?

    Well done!

    • Hi Guner, August or September would be the best time. The very highest parts (especially the Gran Serin route above Assietta) of this route could still have snow in (early) July – as it needs to melt … no ploughing. Although July would probably work. I think June is almost certainly too early.

  9. Hello, Will,

    your posts are a superb reference. As to the Finestre/Assietta etc, which parts would you tolerate to ride on a cyclocross bike (up to 35 tyres), as I would probably take a road- and a cyclocross bike with me?

    Thanks and have fun,

    Matic V

    • Matic, is tough to answer as the quality is changing year to year. All of it can be rough. I remember a friend trying it with 25c tires and getting endless flats. But the real issue is the long downhills. As I said above, I’ve done it with a hybrid 35c with no issues, but had more fun with a mountain bike.

  10. cestdurlevelo on

    Hi Will. I’m going to be riding the assietta for the first time in a couple of weeks. I am used to long distance rides on the road but am not so much used to mountain biking. I am not a talented technical mountain biker for sure. But this looks technically rather doable. Do you reckon the full 91km route is doable in a day? How many hours would that take approximately? Cheers and thanks for the detailed descriptions here…

    • Salut Baptiste,

      When you say the 91 km, do you mean the ride I did starting in Sauze Oulx? For what it is worth it took me 9 hours stopping often for photos. I know you are a stronger rider than me, so you will be much faster. Don’t worry, while it’s best on a mountain bike, it is not “technically” difficult. Just lots of climbing. But beautiful. Bonne chance!

      • cestdurlevelo on

        Salut Will
        Thanks a lot. Yes sorry, I did mean the ride you drew on the map starting from Sauze d’Oulx. Though I’m thinking of a start in Sestriere to slightly shorten it. 9h of mountain biking, I have NEVER done that. Wow. Good to know! And I think I’ll start as often as you for pictures!!! 🙂 Cheers!

  11. Will, is there a preference to ride the Strada dell’Assietta from Sestriere or is just as enjoyable coming from the other side?
    I am considering planning a route to start in Susa and climbing the northern side of the Finestre first, tackling the Strada dell’Assietta and then finishing with an ascent of the southern side en route back to Susa. cheers.

    • No, I think it’s all good. From Sestriere is the “easiest” way up as the town is at 2000 metres and it’s paved below if you start lower. I actually love the pink and especially the brown route up ….. far less well known than via Sestriere or Finestre. But it’s all good. And it’s worth climbing Finestre from Susa. Also the higher road above strada dell’Assietta between Colle dell’Assietta and the Forte de Finestre is special …. and again less well traveled- loop #3 … which starts with Finestre itself. Net, if you want to start and end in Susa and climb Finestre ….. I highly recommend route #3.

Leave A Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

My Cycling Challenge
Exit mobile version