Thinking out loud, that you might have somewhat the same (roughly) weather as I do. I wouldn't put into windrows until hay/grass has quit growing number one. I don't want it to choke out existing hay/grass. Second, I would be tedding any left over stuff back out in early spring BEFORE hay/grass starts to grow (minimizing the choking effect) if possible. Maybe it's just me, but I don't like bare (choked out) spots, they seem to be weed havens in my case. :angry: YMMV.
Larry