If you are planning to cycle up the Grand Colombier from Culoz, the climb is back on. This side of the mountain was closed on 19 June 2026, when part of a cliff collapsed onto the D120 road.
A summer without the Culoz climb
After the rockfall, the Ain Department closed the road with no reopening date, as geological surveys had to be carried out first. Several cycling events had to adapt:
- the final time trial of the Ain Bugey Valromey Tour, on 14 July, was moved from Culoz-Béon to Anglefort and shortened from 17.9 km to 14.9 km;
- the days when the passes are reserved for cyclists, in August and September, were switched to the Anglefort side.
What is confirmed and what is not
According to the Bugey Sud Grand Colombier tourist office, checked on 9 November 2026, the road from Culoz has been open since 3 September, after safety works. However, we found no press release from the Ain Department announcing the reopening, so the date rests on the tourist office’s information alone.
Winter is coming
As every year, all four roads to the summit close for the winter, usually from November until the second half of April. When we checked, the Department had not yet published the closing date for winter 2026-2027. Check the official road information before heading up.
Our Grand Colombier guide covers the different ways up, and the tourist office keeps its cycling page for the Grand Colombier up to date.