Years ago, I cut a nice little patch of alfalfa in early October. Beautiful weather, but I swear, I raked it every few days for weeks, finally giving up and baling it as green as the day I cut it. HEAVY bales. I was scared to put it in the barn, so I stacked it outside and covered it good. I figured it would mold, but it didn't - instead got kinda black and slimy. I started hauling it to a ditch and the cows mobbed it. Ended up feeding it all to them. Accidental silage, I called it.
Like others said - maybe you could aim for silage instead of hay.