Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 |  |
VRS Castricum | 14 march | |
VRS Castricum | 23 october | |||
| 2019 | |
VRS Castricum | 3 october | |
VRS Castricum | 22 october | |||
| 2018 | |
VRS Castricum | 19 february | |
VRS Castricum | 16 october | |||
| 2017 | |
VRS Castricum | 14 march | |
VRS Castricum | 19 october | |||
| 2016 | |
VRS Castricum | 5 march | |
VRS Castricum | 29 october | |||
| 2015 | |
VRS Castricum | 5 march | |
VRS Castricum | 30 october | |||
| 2014 | |
VRS Castricum | 6 october | |
VRS Castricum | 31 october | |||
| 2013 | |
VRS Castricum | 1 march | |
VRS Castricum | 26 october | |||
| 2012 | |
VRS Castricum | 1 march | |
VRS Castricum | 24 october | |||
| 2011 | |
VRS Castricum | 9 october | |
VRS Castricum | 5 november | |||
| 2010 | |
VRS Castricum | 2 march | |
VRS Castricum | 25 october | |||
| 2009 | |
VRS Castricum | 25 february | |
VRS Castricum | 31 october | |||
| 2008 | |
VRS Castricum | 11 february | |
VRS Castricum | 9 october | |||
| 2007 | |
VRS Castricum | 13 march | |
VRS Castricum | 31 october | |||
| 2006 | |
VRS Castricum | 23 march | |
VRS Castricum | 30 october | |||
| 2005 | |
VRS Castricum | 2 march | |
VRS Castricum | 23 october | |||
| 2004 | |
VRS Castricum | 30 september | |
VRS Castricum | 30 october | |||
| 2003 | |
VRS Castricum | 4 march | |
VRS Castricum | 2 november | |||
| 2002 | |
VRS Castricum | 3 october | |
VRS Castricum | 30 october | |||
| 2001 | |
VRS Castricum | 4 october | |
VRS Castricum | 28 october | |||
| 2000 | |
VRS Castricum | 1 october | |
VRS Castricum | 13 november |
