I will be walking the Camino Frances from late September to early November, and am wondering if the hostels will be so busy that I will need to bring my own sleeping mat and bag. Is a sleeping bag required anyways?
Peaceable Projects Inc. is a U.S.-based non-profit group that brings the vast resources of the wide world together with the ongoing needs of the people who live, work, and travel on the Camino de Santiago pilgrim trail network in Spain.
I would say you should take "something" whether that is a sleeping bag, a sleeping bag liner (fleece), or a sleepsack, or a fleece blanket. When you begin, the weather will be warm but toward the end it could be cold in the mountainous alburgues.
Joe took a fleece sleeping bag liner.
I took a Marmot Pounder Plus bag.
We were both comfortable and we walked the same months you are walking.
You will not need a mat.
The alburgues will give you either a mat or a mattress.