Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 23 March | |
VRS Castricum | 18 December | |||
| 2021 | |
VRS Castricum | 8 January | |
VRS Castricum | 23 December | |||
| 2020 | |
VRS Castricum | 7 April | |
VRS Castricum | 31 December | |||
| 2019 | |
VRS Castricum | 20 September | |
VRS Castricum | 14 November | |||
| 2018 | |
VRS Castricum | 28 February | |
VRS Castricum | 6 November | |||
| 2017 | |
VRS Castricum | 6 July | |
VRS Castricum | 11 December | |||
| 2016 | |
VRS Castricum | 17 April | |
VRS Castricum | 29 November | |||
| 2015 | |
VRS Castricum | 6 August | |
VRS Castricum | 4 November | |||
| 2014 | |
VRS Castricum | 19 July | |
VRS Castricum | 19 July | |||
| 2013 | |
VRS Castricum | 22 January | |
VRS Castricum | 11 November | |||
| 2012 | |
VRS Castricum | 3 February | |
VRS Castricum | 8 December | |||
| 2011 | |
VRS Castricum | 1 August | |
VRS Castricum | 13 November | |||
| 2010 | |
VRS Castricum | 2 January | |
VRS Castricum | 3 December | |||
| 2009 | |
VRS Castricum | 9 January | |
VRS Castricum | 22 December | |||
| 2008 | |
VRS Castricum | 24 July | |
VRS Castricum | 31 December | |||
| 2007 | |
VRS Castricum | 2 August | |
VRS Castricum | 21 December | |||
| 2006 | |
VRS Castricum | 16 July | |
VRS Castricum | 6 August | |||
| 2005 | |
VRS Castricum | 2 March | |
VRS Castricum | 31 December | |||
| 2004 | |
VRS Castricum | 1 January | |
VRS Castricum | 21 November | |||
| 2003 | |
VRS Castricum | 1 February | |
VRS Castricum | 10 December | |||
| 2002 | |
VRS Castricum | 24 March | |
VRS Castricum | 11 December | |||
| 2001 | |
VRS Castricum | 16 January | |
VRS Castricum | 30 December | |||
| 2000 | |
VRS Castricum | 12 August | |
VRS Castricum | 23 December | |||
| 1999 | |
VRS Castricum | 9 February | |
VRS Castricum | 9 September | |||
| 1998 | |
VRS Castricum | 23 April | |
VRS Castricum | 3 December | |||
| 1997 | |
VRS Castricum | 7 August | |
VRS Castricum | 14 December | |||
| 1996 | |
VRS Castricum | 4 August | |
VRS Castricum | 24 October | |||
| 1995 | |
VRS Castricum | 6 January | |
VRS Castricum | 11 November | |||
| 1994 | |
VRS Castricum | 10 July | |
VRS Castricum | 29 November | |||
| 1993 | |
VRS Castricum | 1 January | |
VRS Castricum | 21 November | |||
| 1992 | |
VRS Castricum | 23 October | |
VRS Castricum | 23 October | |||
| 1991 | |
VRS Castricum | 3 February | |
VRS Castricum | 29 September | |||
| 1990 | |
VRS Castricum | 29 July | |
VRS Castricum | 17 November | |||
| 1989 | |
VRS Castricum | 27 July | |
VRS Castricum | 12 November | |||
| 1988 | |
VRS Castricum | 31 August | |
VRS Castricum | 26 October | |||
| 1987 | |
VRS Castricum | 8 January | |
VRS Castricum | 9 December | |||
| 1986 | |
VRS Castricum | 2 January | |
VRS Castricum | 15 October | |||
| 1985 | |
VRS Castricum | 4 January | |
VRS Castricum | 30 December | |||
| 1984 | |
VRS Castricum | 10 October | |
VRS Castricum | 5 November | |||
| 1983 | |
VRS Castricum | 21 September | |
VRS Castricum | 23 October | |||
| 1982 | |
VRS Castricum | 9 August | |
VRS Castricum | 10 November | |||
| 1981 | |
VRS Castricum | 5 August | |
VRS Castricum | 17 December | |||
| 1980 | |
VRS Castricum | 17 August | |
VRS Castricum | 4 October | |||
| 1979 | |
VRS Castricum | 8 September | |
VRS Castricum | 8 September | |||
| 1976 | |
VRS Castricum | 29 January | |
VRS Castricum | 20 October | |||
| 1973 | |
VRS Castricum | 2 December | |
VRS Castricum | 2 December | |||
| 1971 | |
VRS Castricum | 27 October | |
VRS Castricum | 27 October |
