When to come?

The cairn of petit Mont is open in 2019:

From Saturday, February 9th to Sunday March, 10th: (winter break) :
Every days of the week (except on Mondays) from 2PM to 5:30 PM

From Saturday, March 30th to Friday, July 5th
Every days of the week (except on Mondays) from 2PM to 6:30 PM

From Saturday, July 6th to Sunday September 1st (summer break)
Every days of the week from 10 AM to 8PM

From Monday, September the 2nd to Sunday, 29th
Every days of the week (except on Mondays) from 2PM to 6:30 PM

From Saturday, October 19th to Sunday, November 3rd (All saint’s day break)
Every days of the week (except on Mondays) from 2 pm to 5:30 PM