Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 6 March | |
VRS Castricum | 27 October | |||
| 2021 | |
VRS Castricum | 8 October | |
VRS Castricum | 3 November | |||
| 2020 | |
VRS Castricum | 4 April | |
VRS Castricum | 11 November | |||
| 2019 | |
VRS Castricum | 28 March | |
VRS Castricum | 31 October | |||
| 2018 | |
VRS Castricum | 1 April | |
VRS Castricum | 17 November | |||
| 2017 | |
VRS Castricum | 8 August | |
VRS Castricum | 16 November | |||
| 2016 | |
VRS Castricum | 31 August | |
VRS Castricum | 7 November | |||
| 2015 | |
VRS Castricum | 20 October | |
VRS Castricum | 1 November | |||
| 2014 | |
VRS Castricum | 31 March | |
VRS Castricum | 13 November | |||
| 2013 | |
VRS Castricum | 26 January | |
VRS Castricum | 23 November | |||
| 2012 | |
VRS Castricum | 14 August | |
VRS Castricum | 12 November | |||
| 2011 | |
VRS Castricum | 29 July | |
VRS Castricum | 12 November | |||
| 2010 | |
VRS Castricum | 3 January | |
VRS Castricum | 31 October | |||
| 2009 | |
VRS Castricum | 3 April | |
VRS Castricum | 1 November | |||
| 2008 | |
VRS Castricum | 17 August | |
VRS Castricum | 3 December | |||
| 2007 | |
VRS Castricum | 10 August | |
VRS Castricum | 17 November | |||
| 2006 | |
VRS Castricum | 31 August | |
VRS Castricum | 19 November | |||
| 2005 | |
VRS Castricum | 16 August | |
VRS Castricum | 13 November | |||
| 2004 | |
VRS Castricum | 24 August | |
VRS Castricum | 30 October | |||
| 2003 | |
VRS Castricum | 29 March | |
VRS Castricum | 16 November | |||
| 2002 | |
VRS Castricum | 3 April | |
VRS Castricum | 30 November | |||
| 2001 | |
VRS Castricum | 22 August | |
VRS Castricum | 21 October | |||
| 2000 | |
VRS Castricum | 23 August | |
VRS Castricum | 22 October | |||
| 1999 | |
VRS Castricum | 3 August | |
VRS Castricum | 4 November | |||
| 1998 | |
VRS Castricum | 1 September | |
VRS Castricum | 4 October | |||
| 1997 | |
VRS Castricum | 9 August | |
VRS Castricum | 30 November | |||
| 1996 | |
VRS Castricum | 8 September | |
VRS Castricum | 16 November | |||
| 1995 | |
VRS Castricum | 20 August | |
VRS Castricum | 26 December | |||
| 1994 | |
VRS Castricum | 20 October | |
VRS Castricum | 26 October | |||
| 1993 | |
VRS Castricum | 20 November | |
VRS Castricum | 20 November | |||
| 1991 | |
VRS Castricum | 3 September | |
VRS Castricum | 31 October | |||
| 1990 | |
VRS Castricum | 14 August | |
VRS Castricum | 14 August | |||
| 1989 | |
VRS Castricum | 10 February | |
VRS Castricum | 10 February | |||
| 1988 | |
VRS Castricum | 30 September | |
VRS Castricum | 12 November | |||
| 1981 | |
VRS Castricum | 19 December | |
VRS Castricum | 20 December | |||
| 1980 | |
VRS Castricum | 2 November | |
VRS Castricum | 2 November | |||
| 1978 | |
VRS Castricum | 18 December | |
VRS Castricum | 23 December | |||
| 1977 | |
VRS Castricum | 16 December | |
VRS Castricum | 16 December | |||
| 1974 | |
VRS Castricum | 13 November | |
VRS Castricum | 13 November | |||
| 1972 | |
VRS Castricum | 17 December | |
VRS Castricum | 17 December | |||
| 1970 | |
VRS Castricum | 29 October | |
VRS Castricum | 8 November | |||
| 1968 | |
VRS Castricum | 5 November | |
VRS Castricum | 5 November |
