Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 9 May | |
VRS Castricum | 9 May | |||
| 2021 | |
VRS Castricum | 9 May | |
VRS Castricum | 8 July | |||
| 2020 | |
VRS Castricum | 10 August | |
VRS Castricum | 11 August | |||
| 2017 | |
VRS Castricum | 2 July | |
VRS Castricum | 2 July | |||
| 2016 | |
VRS Castricum | 2 May | |
VRS Castricum | 18 July | |||
| 2015 | |
VRS Castricum | 24 July | |
VRS Castricum | 24 July | |||
| 2014 | |
VRS Castricum | 15 May | |
VRS Castricum | 8 August | |||
| 2012 | |
VRS Castricum | 28 June | |
VRS Castricum | 28 June | |||
| 2011 | |
VRS Castricum | 20 May | |
VRS Castricum | 15 June | |||
| 2009 | |
VRS Castricum | 11 April | |
VRS Castricum | 11 July | |||
| 2008 | |
VRS Castricum | 22 June | |
VRS Castricum | 22 June | |||
| 2006 | |
VRS Castricum | 3 June | |
VRS Castricum | 3 June | |||
| 2005 | |
VRS Castricum | 26 May | |
VRS Castricum | 27 May | |||
| 2004 | |
VRS Castricum | 31 May | |
VRS Castricum | 31 May | |||
| 2003 | |
VRS Castricum | 16 May | |
VRS Castricum | 16 May | |||
| 2002 | |
VRS Castricum | 20 July | |
VRS Castricum | 3 August | |||
| 2001 | |
VRS Castricum | 6 May | |
VRS Castricum | 6 May | |||
| 2000 | |
VRS Castricum | 18 June | |
VRS Castricum | 30 July | |||
| 1999 | |
VRS Castricum | 24 April | |
VRS Castricum | 13 August | |||
| 1998 | |
VRS Castricum | 11 May | |
VRS Castricum | 15 July | |||
| 1996 | |
VRS Castricum | 23 May | |
VRS Castricum | 19 July | |||
| 1995 | |
VRS Castricum | 25 June | |
VRS Castricum | 25 June | |||
| 1994 | |
VRS Castricum | 22 May | |
VRS Castricum | 16 August | |||
| 1992 | |
VRS Castricum | 4 May | |
VRS Castricum | 8 June | |||
| 1991 | |
VRS Castricum | 30 May | |
VRS Castricum | 21 June | |||
| 1990 | |
VRS Castricum | 6 May | |
VRS Castricum | 6 May | |||
| 1988 | |
VRS Castricum | 19 August | |
VRS Castricum | 19 August | |||
| 1985 | |
VRS Castricum | 18 August | |
VRS Castricum | 18 August | |||
| 1984 | |
VRS Castricum | 18 August | |
VRS Castricum | 22 August | |||
| 1983 | |
VRS Castricum | 18 August | |
VRS Castricum | 19 August | |||
| 1981 | |
VRS Castricum | 23 July | |
VRS Castricum | 23 July | |||
| 1980 | |
VRS Castricum | 25 August | |
VRS Castricum | 25 August | |||
| 1979 | |
VRS Castricum | 11 August | |
VRS Castricum | 11 August | |||
| 1977 | |
VRS Castricum | 19 August | |
VRS Castricum | 19 August |
