This species was first recorded in the Pribilofs in 1968 and has proven to be about annual during the spring and very rare at other times of the year in recent years. Records are widely scattered from mid-May until late June during the spring with a majority of records between May 20th and June 10th during that period. There have been less than 10 summer arrivals of this species, while at least two spring arrivals have lingered into late June or early July. The earliest fall records come from mid-August with regular records during September and October in recent years as coverage has become more extensive. There are also a few mid-winter records of this hardy species, which likely lingers into the winter from the fall period on occasion.
