Should I be worried about raccoons?

My chickens free range in my yard during the daytime, can I let them free range at night as well? My chickens put themselves to bed in their cage at night, and all I have to do is lock it up after they go in, but lately I’ve been wondering if it is ok for me to leave the cage unlocked, as I wake up pretty late nowadays (not early enough to release them after the wake up). I live in the sub urb, so nothing too wild like hawks or foxes, but people I know do say they have a problem with raccoons. I personally have not seen raccoons, nor have I seen signs of them (garbage bin intact, crops intact). I don’t know if these signs (or lack of signs rather) are enough evidence for me to say that I don’t have raccoons in the area. What do you guys think?