When to go to the Alps?

I'm thinking of going to Bourg d'Oisans next year to spend a few days riding the cols round there. When is a reasonable time to go in terms of weather? Is May ok or should I push it back to June to be surer of nicer weather?
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Some of the passes are not open until late May.
See bike-oisans.com. A phone call to the tourist office (the speak good English) and they will send you (for a few euros) a very good platicised laminated guide book of routes for raod bikes.
MC
You'll have a great time - what an awesome place.
Voltaire
http://www.kingofthemountains.co.uk/,
UK couple who run cycle lodge on the col d'ornon road (just south of Bourg) and great place for cycle base.
Fly London Turin for a quick transfer.
http://www.ifhannibalhad.com
Snow will still be evident in late May , early June .
October ? Hmmmmmn , .... I once nearly froze to death - seriously ! - in a white -out traversing the Albula pass in the month of October an age ago . Upon return from Italy had to beat it around via Nice to give the alps a miss as all passes closed .
The Iseran generally doesn't open until the end of the 2nd week in June, the Petit St Bernard (Italian border) opens at the beginning of June and the Cormet is also the beginning of June unless it clears naturally. These are the dates on which the roads will be cleared of any remaining snow by plough. If they clear naturally before these dates, then they may open (or at least be rideable) earlier, but it's unlikely.
Check us out at : www.whiteroomchalet.com/roadweeks.htm
An age ago in late september of whatever the year was, I ascended the Albula pass in Switzerland and topped out in a blizzard. After the descent and still in my shorts, in freezing rain on the road to Klosters and Davos, I was nearly dead with hypothermia ( with hindsight - I realize now). Threw my little tent up along the first forest track I came across , dived in my bag - this about 5'ish in the pm - and was still uncontrollably shaking well after midnight. I suspect my core temp' was near critical then and just the right side of life. I reckon I was fortunate to have been carrying a four season Rab down bag. It's so easy to miscalculate when desperate to get out of a rotten situation.
After knocking the idea of another stroll through the Dolomites and diverting to Corsica, a few weeks later, upon my return on way back to UK I couldn't get past Turin as all the alpine passes were closed. This, about mid October. Had to return south and get around the alps by way of the coast into France. That was followed by the wettest traverse of France imaginable up to the ferry at Zeebrugge.
Can't wait to go back again!
We're off there in just under 2 weeks. Where did you get the book of local rides ? From the tourist office ?
Cheers
"A bad day on the bike is always better than a good day in the office !"
Temps are generally very good. Just need to check weather forecast for the cols, as 2 year ago, we set off from Bourg St Maurice, and it was 24'c, and at the top of the Iseran, with the windchill, it was somewhere between zero and -5'c :!: Not much fun with short finger gloves :!:
"A bad day on the bike is always better than a good day in the office !"
if you do the ride up col de l'ornon, an easy one to start with, and incorporate a loop through villard reymond and villard notre dame, be very careful as you come back down to bourg d'oisans, as there are 3 narrow, unlit tunnels on the way down this very narrow road which is clinging to the side of the mountain!! I had to walk through these a step at a time using the wall for guidance, they are literally pitch black inside!
enjoy your trip!