Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 16 June | |
VRS Castricum | 12 August | |||
| 2020 | |
VRS Castricum | 11 June | |
VRS Castricum | 19 August | |||
| 2019 | |
VRS Castricum | 23 June | |
VRS Castricum | 31 August | |||
| 2018 | |
VRS Castricum | 7 February | |
VRS Castricum | 2 September | |||
| 2017 | |
VRS Castricum | 14 June | |
VRS Castricum | 2 September | |||
| 2016 | |
VRS Castricum | 1 June | |
VRS Castricum | 21 September | |||
| 2015 | |
VRS Castricum | 23 April | |
VRS Castricum | 24 August | |||
| 2014 | |
VRS Castricum | 7 June | |
VRS Castricum | 3 October | |||
| 2013 | |
VRS Castricum | 10 April | |
VRS Castricum | 4 September | |||
| 2012 | |
VRS Castricum | 31 January | |
VRS Castricum | 4 September | |||
| 2011 | |
VRS Castricum | 2 April | |
VRS Castricum | 4 September | |||
| 2010 | |
VRS Castricum | 9 January | |
VRS Castricum | 22 August | |||
| 2009 | |
VRS Castricum | 7 June | |
VRS Castricum | 27 October | |||
| 2008 | |
VRS Castricum | 6 June | |
VRS Castricum | 30 December | |||
| 2007 | |
VRS Castricum | 4 June | |
VRS Castricum | 13 September | |||
| 2006 | |
VRS Castricum | 24 January | |
VRS Castricum | 24 September | |||
| 2005 | |
VRS Castricum | 8 June | |
VRS Castricum | 4 September | |||
| 2004 | |
VRS Castricum | 17 April | |
VRS Castricum | 6 September | |||
| 2003 | |
VRS Castricum | 13 April | |
VRS Castricum | 28 September | |||
| 2002 | |
VRS Castricum | 3 June | |
VRS Castricum | 10 December | |||
| 2001 | |
VRS Castricum | 14 June | |
VRS Castricum | 25 September | |||
| 2000 | |
VRS Castricum | 25 April | |
VRS Castricum | 19 September | |||
| 1999 | |
VRS Castricum | 13 June | |
VRS Castricum | 19 September | |||
| 1998 | |
VRS Castricum | 25 June | |
VRS Castricum | 31 August | |||
| 1997 | |
VRS Castricum | 11 June | |
VRS Castricum | 5 September | |||
| 1996 | |
VRS Castricum | 31 March | |
VRS Castricum | 26 September | |||
| 1995 | |
VRS Castricum | 24 June | |
VRS Castricum | 9 December | |||
| 1994 | |
VRS Castricum | 12 June | |
VRS Castricum | 18 October | |||
| 1993 | |
VRS Castricum | 26 June | |
VRS Castricum | 29 September | |||
| 1992 | |
VRS Castricum | 28 June | |
VRS Castricum | 20 October | |||
| 1991 | |
VRS Castricum | 7 July | |
VRS Castricum | 1 September | |||
| 1990 | |
VRS Castricum | 14 July | |
VRS Castricum | 31 August | |||
| 1989 | |
VRS Castricum | 21 April | |
VRS Castricum | 9 October | |||
| 1988 | |
VRS Castricum | 28 July | |
VRS Castricum | 7 November | |||
| 1987 | |
VRS Castricum | 3 August | |
VRS Castricum | 2 October | |||
| 1986 | |
VRS Castricum | 29 July | |
VRS Castricum | 15 October | |||
| 1985 | |
VRS Castricum | 4 January | |
VRS Castricum | 30 December | |||
| 1984 | |
VRS Castricum | 1 August | |
VRS Castricum | 27 August | |||
| 1983 | |
VRS Castricum | 5 August | |
VRS Castricum | 25 August | |||
| 1982 | |
VRS Castricum | 3 August | |
VRS Castricum | 12 October | |||
| 1981 | |
VRS Castricum | 5 August | |
VRS Castricum | 14 December | |||
| 1980 | |
VRS Castricum | 9 August | |
VRS Castricum | 3 September | |||
| 1979 | |
VRS Castricum | 13 August | |
VRS Castricum | 31 August | |||
| 1978 | |
VRS Castricum | 1 August | |
VRS Castricum | 22 August | |||
| 1977 | |
VRS Castricum | 15 August | |
VRS Castricum | 4 December | |||
| 1976 | |
VRS Castricum | 20 August | |
VRS Castricum | 14 November | |||
| 1971 | |
VRS Castricum | 12 August | |
VRS Castricum | 12 August |
