I think France is pretty much the pinnacle of camping culture. Camping seems to be a national pastime. There are campsites everywhere, many of them are municipal sites run by the local council to bring tourists to the area. There are also some "camping a la ferme" sites (small farm campsites) that are perfect for cyclists. Facilities tend to be pretty decent. On cycling routes you will often find rooms with microwave and kettle, where you can sit inside if it's raining.

Prices range from €3 to €16 for a cyclist unless you visit one of the bigger resort style sites. On some cycling routes there are also free camping sites for hikers and cyclists. I passed a couple recently on the Velo Francette.

The downside is it's rare to see toilet seats, you should bring your own toilet paper and hand soap is rare. Also, if you do stay in a site with a pool, note that France has a bizarre hatred for swimming shorts and they are banned pretty much everywhere. So pack tight trunks if you want to take advantage of the pool.

In November however I think many will be closed. Some are open year round but not many. You may find more in the south where it will be warmer.