WSS peak sample time in 2021 was 6/1 with the highest adult count from a single field being 753 adults.

Peak flights in previous years were as follows: 2011: 6/3, 612 adults; 2012: 5/10, 2080 adults; 2013: 5/29, 246 adults; 2014: 5/28, 901 adults; 2015: 6/2, 726 adults; 2016: 6/1, 1187 adults; 2017: 5/31, 770 adults; 2018: 5/23, 931 adults, 2019: 5/30, 1148 adults, 2020: 5/29, 1243 adults.