DCHP-1 Online
goose month [trans. < Cree; see 1965 quote] 
the month in which the spring migration of geese occurs, roughly from mid-March to mid-April.
See also: goose moon
- 1784 The savages, in some respects, regulate their months by the appearance of birds; and have their Goose month from the vernal appearance of Geese from the south.
- 1939 Spring arrived in April--the goose month. . . .
- 1965 April in the Cree dialect of this area is Niskapesim, goose month. That means Canada geese; and September is Wawaypesim, wavy goose moon ( " wavy " being English-Cree slang for blue and snowy goose).
- 1784 The savages, in some respects, regulate their months by the appearance of birds; and have their Goose month from the vernal appearance of Geese from the south.