Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 3 January | |
VRS Castricum | 30 April | |||
| 2020 | |
VRS Castricum | 26 March | |
VRS Castricum | 31 December | |||
| 2019 | |
VRS Castricum | 5 October | |
VRS Castricum | 31 October | |||
| 2018 | |
VRS Castricum | 1 March | |
VRS Castricum | 4 November | |||
| 2017 | |
VRS Castricum | 25 September | |
VRS Castricum | 25 November | |||
| 2016 | |
VRS Castricum | 14 April | |
VRS Castricum | 11 November | |||
| 2015 | |
VRS Castricum | 29 September | |
VRS Castricum | 28 October | |||
| 2013 | |
VRS Castricum | 29 September | |
VRS Castricum | 29 September | |||
| 2010 | |
VRS Castricum | 22 November | |
VRS Castricum | 28 November | |||
| 2009 | |
VRS Castricum | 20 October | |
VRS Castricum | 22 December | |||
| 2008 | |
VRS Castricum | 6 October | |
VRS Castricum | 13 November | |||
| 2007 | |
VRS Castricum | 5 October | |
VRS Castricum | 21 October | |||
| 2006 | |
VRS Castricum | 19 October | |
VRS Castricum | 25 October | |||
| 2005 | |
VRS Castricum | 11 October | |
VRS Castricum | 13 November | |||
| 2004 | |
VRS Castricum | 29 September | |
VRS Castricum | 13 October | |||
| 2003 | |
VRS Castricum | 12 October | |
VRS Castricum | 10 November | |||
| 2002 | |
VRS Castricum | 31 October | |
VRS Castricum | 31 October | |||
| 2001 | |
VRS Castricum | 2 December | |
VRS Castricum | 2 December | |||
| 2000 | |
VRS Castricum | 13 October | |
VRS Castricum | 21 October | |||
| 1999 | |
VRS Castricum | 6 October | |
VRS Castricum | 15 October | |||
| 1998 | |
VRS Castricum | 13 October | |
VRS Castricum | 13 October | |||
| 1997 | |
VRS Castricum | 30 September | |
VRS Castricum | 2 November | |||
| 1996 | |
VRS Castricum | 18 September | |
VRS Castricum | 14 November | |||
| 1995 | |
VRS Castricum | 3 October | |
VRS Castricum | 23 October | |||
| 1994 | |
VRS Castricum | 17 October | |
VRS Castricum | 29 November | |||
| 1993 | |
VRS Castricum | 26 October | |
VRS Castricum | 27 October | |||
| 1989 | |
VRS Castricum | 21 September | |
VRS Castricum | 8 December |
