Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 10 February | |
VRS Castricum | 14 February | |||
| 2020 | |
VRS Castricum | 22 June | |
VRS Castricum | 22 June | |||
| 2019 | |
VRS Castricum | 25 January | |
VRS Castricum | 1 February | |||
| 2018 | |
VRS Castricum | 28 February | |
VRS Castricum | 16 December | |||
| 2017 | |
VRS Castricum | 10 February | |
VRS Castricum | 14 February | |||
| 2015 | |
VRS Castricum | 29 July | |
VRS Castricum | 29 July | |||
| 2013 | |
VRS Castricum | 18 January | |
VRS Castricum | 12 February | |||
| 2012 | |
VRS Castricum | 3 February | |
VRS Castricum | 7 December | |||
| 2011 | |
VRS Castricum | 7 July | |
VRS Castricum | 7 July | |||
| 2010 | |
VRS Castricum | 1 January | |
VRS Castricum | 30 December | |||
| 2009 | |
VRS Castricum | 2 January | |
VRS Castricum | 23 December | |||
| 2008 | |
VRS Castricum | 1 June | |
VRS Castricum | 31 December | |||
| 2007 | |
VRS Castricum | 24 June | |
VRS Castricum | 5 August | |||
| 2006 | |
VRS Castricum | 25 May | |
VRS Castricum | 7 August | |||
| 2005 | |
VRS Castricum | 6 March | |
VRS Castricum | 10 August | |||
| 2004 | |
VRS Castricum | 27 May | |
VRS Castricum | 22 June | |||
| 2003 | |
VRS Castricum | 10 January | |
VRS Castricum | 27 June | |||
| 2002 | |
VRS Castricum | 30 June | |
VRS Castricum | 30 June | |||
| 2001 | |
VRS Castricum | 9 June | |
VRS Castricum | 9 June | |||
| 2000 | |
VRS Castricum | 12 June | |
VRS Castricum | 4 July | |||
| 1999 | |
VRS Castricum | 6 June | |
VRS Castricum | 13 June | |||
| 1998 | |
VRS Castricum | 7 June | |
VRS Castricum | 19 July | |||
| 1997 | |
VRS Castricum | 9 January | |
VRS Castricum | 17 July | |||
| 1996 | |
VRS Castricum | 1 January | |
VRS Castricum | 14 July | |||
| 1995 | |
VRS Castricum | 7 January | |
VRS Castricum | 31 December | |||
| 1994 | |
VRS Castricum | 20 February | |
VRS Castricum | 3 July | |||
| 1993 | |
VRS Castricum | 1 January | |
VRS Castricum | 28 November | |||
| 1992 | |
VRS Castricum | 25 January | |
VRS Castricum | 31 December | |||
| 1991 | |
VRS Castricum | 15 January | |
VRS Castricum | 11 February | |||
| 1990 | |
VRS Castricum | 27 March | |
VRS Castricum | 18 December | |||
| 1989 | |
VRS Castricum | 18 January | |
VRS Castricum | 4 December | |||
| 1988 | |
VRS Castricum | 2 December | |
VRS Castricum | 2 December | |||
| 1987 | |
VRS Castricum | 11 January | |
VRS Castricum | 14 March | |||
| 1986 | |
VRS Castricum | 1 January | |
VRS Castricum | 24 December | |||
| 1985 | |
VRS Castricum | 6 January | |
VRS Castricum | 31 December | |||
| 1984 | |
VRS Castricum | 23 January | |
VRS Castricum | 27 January | |||
| 1983 | |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 1982 | |
VRS Castricum | 8 January | |
VRS Castricum | 15 January | |||
| 1981 | |
VRS Castricum | 26 August | |
VRS Castricum | 28 December | |||
| 1980 | |
VRS Castricum | 18 January | |
VRS Castricum | 18 January | |||
| 1979 | |
VRS Castricum | 2 January | |
VRS Castricum | 20 February | |||
| 1978 | |
VRS Castricum | 17 February | |
VRS Castricum | 8 December | |||
| 1977 | |
VRS Castricum | 28 November | |
VRS Castricum | 28 November | |||
| 1976 | |
VRS Castricum | 30 January | |
VRS Castricum | 30 December | |||
| 1975 | |
VRS Castricum | 3 January | |
VRS Castricum | 15 November | |||
| 1974 | |
VRS Castricum | 19 October | |
VRS Castricum | 10 November | |||
| 1973 | |
VRS Castricum | 17 August | |
VRS Castricum | 1 December | |||
| 1972 | |
VRS Castricum | 1 February | |
VRS Castricum | 4 November | |||
| 1971 | |
VRS Castricum | 1 January | |
VRS Castricum | 4 December | |||
| 1970 | |
VRS Castricum | 27 December | |
VRS Castricum | 27 December | |||
| 1969 | |
VRS Castricum | 11 November | |
VRS Castricum | 16 November | |||
| 1965 | |
VRS Castricum | 17 November | |
VRS Castricum | 20 November |
