now till spring is good.
obviously you need a well designed plan, i'm sure you have already. a good preditor guard can be made with cheap plastic childrens saucer sleds.
also if you want to put them on state land you need to contact the head ranger or dnr officer for that land. and as a loast reminder , these boxes have to be maintained. cleaned out every year and bedding replaced.
if it doesn't get used right away don;t worry, sometimes it takes a year or two before a duck finds and likes it.
:fish: