Well, I dont know about an actual fall spawn, meaning September, October, and November. However, I once documented that bass were spawning into late July. The spawn may have continued but I didnt go back after that. In that lake, I also documented that during certain years, multiple spawns had occurred. This was done by looking at the incremental growth during the birth year. For some reason during certain years you could clearly see that there were multiple length modes during the birth year, and the differences among modes were large enough that clearly the modes were due to being spawned many months apart. The interesting thing about this lake is that water temp rarely, if ever, increased beyond the optimal spawning temperature. This was due to the climate of where the lake was located. So in theory fish in that lake could have continued to spawn into the fall. If it can happen there, I would imagine it can happen at other lakes.