just to clarify - i think there is some terminology confusion going on...
fescue: cool season grass
bermuda: warm season grass
fescue IS actively growing now. it goes dormant in july/august when drought and heat turn it brown. it will resume growing again when temperature and moisture conditions trigger it to come out of dormancy which is a protective measure it employs to survive.
fescue will remain green and growing even when covered with snow.
i do agree that waiting until about a month before you plan to plant your warm season crop is best. it will allow the fescue not only to perform erosion control in the spring but also to choke out other species (weeds) that would otherwise go to seed quickly and compete with whatever you are planting.
fwiw, i personally feel that fescue is the best choice in SW missouri for a year round green crop. no other species will provide green lawn for more months in our climate. bermuda is the other biggie but goes brown from october through april. that's about six months of brown. fescue will only brown up when hot and dry. that is only 2 months or so in the ozarks. just my .02...
also, beware of what you plant. bermuda/centipede/bentgrass/zoysia, etc are much harder to get rid of once established than fescue...
just out of curiosity, what are you considering a native missouri warm season grass?
amp