This species has been found most commonly in the spring during mid-late May and in the fall in late September, though it is a sporadic migrant (vagrant) and may not appear in the islands for several years between sightings. There are records from two summer periods for this species as well but in both cases they were (or likely were) continuing individuals after arriving in the spring.
The confirmed nesting of this species on the island in May-June 1995 was also the first recorded natural nesting attempt in North America. This species also displayed probable breeding behavior in July 1970 and June 1998 on St. Paul Island.
