Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 25 August | |
VRS Castricum | 9 September | |||
| 2020 | |
VRS Castricum | 1 September | |
VRS Castricum | 8 November | |||
| 2019 | |
VRS Castricum | 21 August | |
VRS Castricum | 10 November | |||
| 2018 | |
VRS Castricum | 9 August | |
VRS Castricum | 25 October | |||
| 2017 | |
VRS Castricum | 3 September | |
VRS Castricum | 18 October | |||
| 2016 | |
VRS Castricum | 29 May | |
VRS Castricum | 20 September | |||
| 2015 | |
VRS Castricum | 4 June | |
VRS Castricum | 30 October | |||
| 2014 | |
VRS Castricum | 25 August | |
VRS Castricum | 3 October | |||
| 2013 | |
VRS Castricum | 7 September | |
VRS Castricum | 27 September | |||
| 2012 | |
VRS Castricum | 11 August | |
VRS Castricum | 28 November | |||
| 2011 | |
VRS Castricum | 17 August | |
VRS Castricum | 30 September | |||
| 2010 | |
VRS Castricum | 10 August | |
VRS Castricum | 5 September | |||
| 2009 | |
VRS Castricum | 17 August | |
VRS Castricum | 13 October | |||
| 2008 | |
VRS Castricum | 23 August | |
VRS Castricum | 13 October | |||
| 2007 | |
VRS Castricum | 23 August | |
VRS Castricum | 26 September | |||
| 2006 | |
VRS Castricum | 9 September | |
VRS Castricum | 27 September | |||
| 2005 | |
VRS Castricum | 19 August | |
VRS Castricum | 31 August | |||
| 2004 | |
VRS Castricum | 24 August | |
VRS Castricum | 24 August | |||
| 2003 | |
VRS Castricum | 12 August | |
VRS Castricum | 14 October | |||
| 2002 | |
VRS Castricum | 20 August | |
VRS Castricum | 31 October | |||
| 2001 | |
VRS Castricum | 24 August | |
VRS Castricum | 25 September | |||
| 2000 | |
VRS Castricum | 4 August | |
VRS Castricum | 4 August | |||
| 1999 | |
VRS Castricum | 25 August | |
VRS Castricum | 9 September | |||
| 1998 | |
VRS Castricum | 12 September | |
VRS Castricum | 12 September | |||
| 1997 | |
VRS Castricum | 11 September | |
VRS Castricum | 11 September | |||
| 1996 | |
VRS Castricum | 27 August | |
VRS Castricum | 7 October | |||
| 1995 | |
VRS Castricum | 16 August | |
VRS Castricum | 31 August | |||
| 1993 | |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 1992 | |
VRS Castricum | 20 August | |
VRS Castricum | 6 September | |||
| 1990 | |
VRS Castricum | 27 August | |
VRS Castricum | 27 August | |||
| 1989 | |
VRS Castricum | 22 August | |
VRS Castricum | 8 October | |||
| 1986 | |
VRS Castricum | 17 November | |
VRS Castricum | 17 November | |||
| 1984 | |
VRS Castricum | 21 August | |
VRS Castricum | 21 August | |||
| 1983 | |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 1978 | |
VRS Castricum | 18 August | |
VRS Castricum | 24 September | |||
| 1969 | |
VRS Castricum | 6 November | |
VRS Castricum | 6 November |
