I mow mine till about 2 weeks before season opens I make sure I top off the feeders and just stay out till opening day most of the time if they don't feel threatened It won't really affect them alot don't stop and stair if they are out there just keep on going on mowing even after a while they will get use to you being there and doubt they would see you as a threat I see it a lot with the guys who check the oil wells where I hunt they pay zero attention to those guys. Deer are lazy animals they will almost always take the path of least resistance you keep your trails mowed and they will use them.