A wide-ranging and unpredictable migrant. The earliest seasonal date in Vermont is 11 July, giving the impression that the records are primarily individuals that wander into Vermont after emerging elsewhere. Half of the records for this species are from the Champlain Valley, while the others are scattered from the Northern and Southern Piedmont regions, Northeast Highlands and other mountainous regions of the state. At least two breeding sites are known from Vermont. Large flights have been observed in mid August in recent years. This species is often seen patrolling in parking lots where reflectance from cars seems to mirror breeding sites.
July 11 – October 3