BFO is an annual. It can also be used as a cover crop - over clover for instance, just plant about 1/3 the usual amount if used as a cover crop.

Plant mid to late August, and you will have good growth by bow season.

I am clearing some trees for a new plot and it was suggested (thanks Farm Hunter and RonM)I use oats for my first planting this fall. I can till it in next spring for some additional biomass on next years crop.