Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 8 May | |
VRS Castricum | 8 May | |||
| 2020 | |
VRS Castricum | 25 April | |
VRS Castricum | 25 April | |||
| 2019 | |
VRS Castricum | 16 July | |
VRS Castricum | 16 July | |||
| 2018 | |
VRS Castricum | 10 May | |
VRS Castricum | 10 May | |||
| 2017 | |
VRS Castricum | 15 July | |
VRS Castricum | 15 July | |||
| 2016 | |
VRS Castricum | 25 August | |
VRS Castricum | 25 August | |||
| 2014 | |
VRS Castricum | 19 July | |
VRS Castricum | 19 July | |||
| 2013 | |
VRS Castricum | 23 July | |
VRS Castricum | 23 July | |||
| 2012 | |
VRS Castricum | 1 May | |
VRS Castricum | 22 July | |||
| 2011 | |
VRS Castricum | 5 May | |
VRS Castricum | 25 August | |||
| 2010 | |
VRS Castricum | 29 June | |
VRS Castricum | 29 June | |||
| 2008 | |
VRS Castricum | 22 August | |
VRS Castricum | 22 August | |||
| 2006 | |
VRS Castricum | 17 May | |
VRS Castricum | 17 May | |||
| 2005 | |
VRS Castricum | 16 May | |
VRS Castricum | 16 May | |||
| 2004 | |
VRS Castricum | 29 April | |
VRS Castricum | 30 July | |||
| 2003 | |
VRS Castricum | 21 April | |
VRS Castricum | 21 April | |||
| 2002 | |
VRS Castricum | 25 April | |
VRS Castricum | 15 May | |||
| 2001 | |
VRS Castricum | 4 August | |
VRS Castricum | 4 August | |||
| 2000 | |
VRS Castricum | 13 May | |
VRS Castricum | 2 August | |||
| 1999 | |
VRS Castricum | 1 August | |
VRS Castricum | 24 August | |||
| 1998 | |
VRS Castricum | 25 April | |
VRS Castricum | 17 August | |||
| 1997 | |
VRS Castricum | 29 August | |
VRS Castricum | 8 September | |||
| 1996 | |
VRS Castricum | 9 July | |
VRS Castricum | 19 July | |||
| 1995 | |
VRS Castricum | 24 July | |
VRS Castricum | 24 July | |||
| 1994 | |
VRS Castricum | 30 April | |
VRS Castricum | 8 September | |||
| 1993 | |
VRS Castricum | 17 July | |
VRS Castricum | 21 August | |||
| 1992 | |
VRS Castricum | 21 July | |
VRS Castricum | 18 August | |||
| 1991 | |
VRS Castricum | 14 August | |
VRS Castricum | 14 August | |||
| 1990 | |
VRS Castricum | 22 August | |
VRS Castricum | 22 August | |||
| 1989 | |
VRS Castricum | 29 April | |
VRS Castricum | 18 August | |||
| 1988 | |
VRS Castricum | 15 August | |
VRS Castricum | 19 August | |||
| 1987 | |
VRS Castricum | 23 August | |
VRS Castricum | 8 September | |||
| 1985 | |
VRS Castricum | 14 August | |
VRS Castricum | 15 September | |||
| 1983 | |
VRS Castricum | 7 September | |
VRS Castricum | 7 September | |||
| 1982 | |
VRS Castricum | 11 August | |
VRS Castricum | 15 August | |||
| 1981 | |
VRS Castricum | 6 October | |
VRS Castricum | 6 October | |||
| 1980 | |
VRS Castricum | 2 August | |
VRS Castricum | 13 August | |||
| 1977 | |
VRS Castricum | 2 September | |
VRS Castricum | 15 September |
