Hola
When I walked a winter Camino the Albergue/pilgrim office in Saint Jean provided a photocopied A4 sheet with a the list of albergues that was open on Frances.
This list basically had one albergue open for each ≈25 km days, following
Brierley and other guides.
As we found out the list was not entirely correct.
At a few towns we found an albergue that was closed despite being on the open-list.
As well as there were more albergues open than on the list.
It seemed that the way the list was done was by phoning to albergues and asking if they were open and putting this on the list.
This resulted in an un-updated list as life and coincidences changed the situation ahead, but I did like this analogue and useful list.
Along the way, ask the hospitalero/a about the situation ahead, as they often know or make calls to confirm information on the list.
Some towns will open an alberuge or hostal if many pilgrims are arriving or on route.
Buen Camino
Lettinggo