Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 |  |
VRS Castricum | 29 March | |
VRS Castricum | 3 June | |||
| 2022 | |
VRS Castricum | 11 April | |
VRS Castricum | 10 August | |||
| 2021 | |
VRS Castricum | 30 March | |
VRS Castricum | 12 September | |||
| 2020 | |
VRS Castricum | 23 March | |
VRS Castricum | 27 August | |||
| 2019 | |
VRS Castricum | 1 April | |
VRS Castricum | 21 April | |||
| 2018 | |
VRS Castricum | 27 March | |
VRS Castricum | 29 August | |||
| 2017 | |
VRS Castricum | 3 April | |
VRS Castricum | 10 May | |||
| 2016 | |
VRS Castricum | 31 March | |
VRS Castricum | 7 July | |||
| 2015 | |
VRS Castricum | 19 April | |
VRS Castricum | 6 July | |||
| 2014 | |
VRS Castricum | 12 April | |
VRS Castricum | 4 September | |||
| 2013 | |
VRS Castricum | 6 May | |
VRS Castricum | 16 July | |||
| 2012 | |
VRS Castricum | 2 April | |
VRS Castricum | 3 August | |||
| 2011 | |
VRS Castricum | 8 April | |
VRS Castricum | 16 September | |||
| 2010 | |
VRS Castricum | 5 April | |
VRS Castricum | 25 July | |||
| 2009 | |
VRS Castricum | 1 April | |
VRS Castricum | 9 August | |||
| 2008 | |
VRS Castricum | 16 April | |
VRS Castricum | 1 May | |||
| 2007 | |
VRS Castricum | 16 April | |
VRS Castricum | 25 April | |||
| 2006 | |
VRS Castricum | 10 June | |
VRS Castricum | 10 June | |||
| 2005 | |
VRS Castricum | 16 April | |
VRS Castricum | 24 August | |||
| 2004 | |
VRS Castricum | 14 April | |
VRS Castricum | 6 June | |||
| 2003 | |
VRS Castricum | 21 April | |
VRS Castricum | 26 May | |||
| 2002 | |
VRS Castricum | 18 April | |
VRS Castricum | 18 April | |||
| 2000 | |
VRS Castricum | 11 April | |
VRS Castricum | 11 April | |||
| 1999 | |
VRS Castricum | 24 April | |
VRS Castricum | 22 September | |||
| 1998 | |
VRS Castricum | 1 April | |
VRS Castricum | 19 September | |||
| 1997 | |
VRS Castricum | 24 July | |
VRS Castricum | 23 October | |||
| 1996 | |
VRS Castricum | 30 July | |
VRS Castricum | 15 September | |||
| 1995 | |
VRS Castricum | 24 April | |
VRS Castricum | 16 September | |||
| 1993 | |
VRS Castricum | 25 April | |
VRS Castricum | 25 April | |||
| 1991 | |
VRS Castricum | 2 August | |
VRS Castricum | 2 August | |||
| 1990 | |
VRS Castricum | 9 August | |
VRS Castricum | 12 August | |||
| 1989 | |
VRS Castricum | 17 June | |
VRS Castricum | 4 August | |||
| 1981 | |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 1972 | |
VRS Castricum | 28 September | |
VRS Castricum | 28 September |
