Wrens arrive in Missouri about April 10-20. Two and three broods per year are common. Normal clutch size is six to eight eggs. Incubation is about 15 days, and age to first flight another 15 days. they winter in southern states.
  mount or hang the house six to ten feet high in or near a tree or shrub. House wrens seem to prefer more open countryside and frequent farmsteads more than urban lots. It pays to put up two or three wren houses in a back yard. The houses may be 20 to 50 feet apart. Males sometimes attract two females to use the extra houses. They seldom build second or third nests in the same house in the same year :they move to one of the vacant houses instead..