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I'm guessing it very much depends whether you plan to sleep high or low
This is right - i had tent, insulated ground mat and a thin quilt sleeping (bag) rated to not much less then 10* - at altitude (for example one night sleeping outside sestriere) it was very cold indeed - too cold to sleep properly - locals were even suggesting not wild camping as temperature gets down to near freezing that high up. Plainly it is fine to camp out but you had best be prepared. Also don't forget that you will probably be tired, hungry, maybe having got too much sun during the day...all reasons your body we be less able to cope with the cold.
my advice is be well prepared to sleep out in anything down to 0*
. because my quilt wasn't that warm i tried to sleep as low as possible which affected distances i could travel during the day and route choices etc - also missed out of some amazing bivy spots.
its always best to be prepared generally as a simple mechanical could mean you are stuck at night in the rain over 2000 m with temperatures getting close to freezing.
I think the best setup would be bag rated to 0*, insulated ground mat, bivy bag and tarp.
carson-
That's great, thanks! Currently looking PHD minimus which is rated at 5* with bivvy then insulated ground mat and likely a liner. I think I'd rather the liner over warmer bag to increase flexibility with sleeping high/low and ability to spread weight and packing across bags if needed.
Hadn't factored in tarp, assuming it being dry, but like you say, don't want to be fought out on a wet night.
Fforiwr
Very early planning for 2018 TNR here - those who have ridden it previously, what was the sleeping setup like?
I'm currently considering summer sleeping bag with bivvy as backup extra. I'm guessing it very much depends whether you plan to sleep high or low. Could anyone share experiences?