Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 4 October | |
VRS Castricum | 23 October | |||
| 2018 | |
VRS Castricum | 7 January | |
VRS Castricum | 18 November | |||
| 2017 | |
VRS Castricum | 26 March | |
VRS Castricum | 19 December | |||
| 2016 | |
VRS Castricum | 29 October | |
VRS Castricum | 28 November | |||
| 2015 | |
VRS Castricum | 23 October | |
VRS Castricum | 23 October | |||
| 2013 | |
VRS Castricum | 18 October | |
VRS Castricum | 23 November | |||
| 2011 | |
VRS Castricum | 7 March | |
VRS Castricum | 4 April | |||
| 2010 | |
VRS Castricum | 24 October | |
VRS Castricum | 29 November | |||
| 2008 | |
VRS Castricum | 18 November | |
VRS Castricum | 7 December | |||
| 2007 | |
VRS Castricum | 20 October | |
VRS Castricum | 17 December | |||
| 2006 | |
VRS Castricum | 15 January | |
VRS Castricum | 12 October | |||
| 2005 | |
VRS Castricum | 13 November | |
VRS Castricum | 21 December | |||
| 2003 | |
VRS Castricum | 7 November | |
VRS Castricum | 7 November | |||
| 2002 | |
VRS Castricum | 31 March | |
VRS Castricum | 16 November | |||
| 2001 | |
VRS Castricum | 27 February | |
VRS Castricum | 2 December | |||
| 1997 | |
VRS Castricum | 4 March | |
VRS Castricum | 13 November | |||
| 1996 | |
VRS Castricum | 15 March | |
VRS Castricum | 14 December | |||
| 1995 | |
VRS Castricum | 4 November | |
VRS Castricum | 29 December | |||
| 1994 | |
VRS Castricum | 4 November | |
VRS Castricum | 2 December | |||
| 1991 | |
VRS Castricum | 10 March | |
VRS Castricum | 10 March | |||
| 1990 | |
VRS Castricum | 4 November | |
VRS Castricum | 18 December | |||
| 1989 | |
VRS Castricum | 10 January | |
VRS Castricum | 4 December | |||
| 1988 | |
VRS Castricum | 24 October | |
VRS Castricum | 31 December | |||
| 1987 | |
VRS Castricum | 8 January | |
VRS Castricum | 2 November | |||
| 1986 | |
VRS Castricum | 3 November | |
VRS Castricum | 23 December | |||
| 1985 | |
VRS Castricum | 3 January | |
VRS Castricum | 31 December | |||
| 1984 | |
VRS Castricum | 31 October | |
VRS Castricum | 13 November | |||
| 1982 | |
VRS Castricum | 27 October | |
VRS Castricum | 29 November | |||
| 1981 | |
VRS Castricum | 15 November | |
VRS Castricum | 12 December | |||
| 1979 | |
VRS Castricum | 30 December | |
VRS Castricum | 30 December | |||
| 1978 | |
VRS Castricum | 15 December | |
VRS Castricum | 15 December | |||
| 1977 | |
VRS Castricum | 28 November | |
VRS Castricum | 21 December | |||
| 1975 | |
VRS Castricum | 17 October | |
VRS Castricum | 20 December | |||
| 1974 | |
VRS Castricum | 29 October | |
VRS Castricum | 1 November | |||
| 1973 | |
VRS Castricum | 12 October | |
VRS Castricum | 12 October | |||
| 1972 | |
VRS Castricum | 14 October | |
VRS Castricum | 25 December | |||
| 1970 | |
VRS Castricum | 22 November | |
VRS Castricum | 26 November | |||
| 1968 | |
VRS Castricum | 9 November | |
VRS Castricum | 9 November | |||
| 1966 | |
VRS Castricum | 12 November | |
VRS Castricum | 18 November | |||
| 1965 | |
VRS Castricum | 23 October | |
VRS Castricum | 16 November | |||
| 1962 | |
VRS Castricum | 21 October | |
VRS Castricum | 20 November | |||
| 1961 | |
VRS Castricum | 5 November | |
VRS Castricum | 19 November |
