Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 24 March | |
VRS Castricum | 24 March | |||
| 2021 | |
VRS Castricum | 3 July | |
VRS Castricum | 3 July | |||
| 2019 | |
VRS Castricum | 15 October | |
VRS Castricum | 23 October | |||
| 2018 | |
VRS Castricum | 4 April | |
VRS Castricum | 4 April | |||
| 2016 | |
VRS Castricum | 24 October | |
VRS Castricum | 24 October | |||
| 2015 | |
VRS Castricum | 25 October | |
VRS Castricum | 26 October | |||
| 2013 | |
VRS Castricum | 10 April | |
VRS Castricum | 25 October | |||
| 2012 | |
VRS Castricum | 24 July | |
VRS Castricum | 22 October | |||
| 2011 | |
VRS Castricum | 1 October | |
VRS Castricum | 1 October | |||
| 2010 | |
VRS Castricum | 9 July | |
VRS Castricum | 7 November | |||
| 2009 | |
VRS Castricum | 31 October | |
VRS Castricum | 31 October | |||
| 2007 | |
VRS Castricum | 12 May | |
VRS Castricum | 18 November | |||
| 2006 | |
VRS Castricum | 7 August | |
VRS Castricum | 7 August | |||
| 2005 | |
VRS Castricum | 29 March | |
VRS Castricum | 29 March | |||
| 2004 | |
VRS Castricum | 3 August | |
VRS Castricum | 9 August | |||
| 2003 | |
VRS Castricum | 29 March | |
VRS Castricum | 25 September | |||
| 2001 | |
VRS Castricum | 31 March | |
VRS Castricum | 23 October | |||
| 2000 | |
VRS Castricum | 2 April | |
VRS Castricum | 21 October | |||
| 1999 | |
VRS Castricum | 13 March | |
VRS Castricum | 5 April | |||
| 1998 | |
VRS Castricum | 29 March | |
VRS Castricum | 19 October | |||
| 1997 | |
VRS Castricum | 13 March | |
VRS Castricum | 17 July | |||
| 1996 | |
VRS Castricum | 7 April | |
VRS Castricum | 18 October | |||
| 1995 | |
VRS Castricum | 28 June | |
VRS Castricum | 22 October | |||
| 1994 | |
VRS Castricum | 8 May | |
VRS Castricum | 5 November | |||
| 1993 | |
VRS Castricum | 10 October | |
VRS Castricum | 10 October | |||
| 1992 | |
VRS Castricum | 6 April | |
VRS Castricum | 24 July | |||
| 1991 | |
VRS Castricum | 23 July | |
VRS Castricum | 21 October | |||
| 1990 | |
VRS Castricum | 15 July | |
VRS Castricum | 23 October | |||
| 1989 | |
VRS Castricum | 28 October | |
VRS Castricum | 28 October | |||
| 1988 | |
VRS Castricum | 6 August | |
VRS Castricum | 6 August | |||
| 1987 | |
VRS Castricum | 16 September | |
VRS Castricum | 19 October | |||
| 1986 | |
VRS Castricum | 9 August | |
VRS Castricum | 7 November | |||
| 1985 | |
VRS Castricum | 20 October | |
VRS Castricum | 20 October | |||
| 1984 | |
VRS Castricum | 21 October | |
VRS Castricum | 21 October | |||
| 1982 | |
VRS Castricum | 14 April | |
VRS Castricum | 14 April | |||
| 1981 | |
VRS Castricum | 15 April | |
VRS Castricum | 15 April | |||
| 1979 | |
VRS Castricum | 5 October | |
VRS Castricum | 14 October | |||
| 1978 | |
VRS Castricum | 9 October | |
VRS Castricum | 9 October | |||
| 1977 | |
VRS Castricum | 28 October | |
VRS Castricum | 17 November | |||
| 1976 | |
VRS Castricum | 22 September | |
VRS Castricum | 25 October | |||
| 1975 | |
VRS Castricum | 30 October | |
VRS Castricum | 30 October | |||
| 1974 | |
VRS Castricum | 21 October | |
VRS Castricum | 21 October | |||
| 1972 | |
VRS Castricum | 19 October | |
VRS Castricum | 19 October | |||
| 1970 | |
VRS Castricum | 11 October | |
VRS Castricum | 11 October | |||
| 1968 | |
VRS Castricum | 5 October | |
VRS Castricum | 26 October |
