Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 11 April | |
VRS Castricum | 21 September | |||
| 2021 | |
VRS Castricum | 12 April | |
VRS Castricum | 27 September | |||
| 2020 | |
VRS Castricum | 15 April | |
VRS Castricum | 22 September | |||
| 2019 | |
VRS Castricum | 3 April | |
VRS Castricum | 9 September | |||
| 2018 | |
VRS Castricum | 6 April | |
VRS Castricum | 5 September | |||
| 2017 | |
VRS Castricum | 31 March | |
VRS Castricum | 19 September | |||
| 2016 | |
VRS Castricum | 1 April | |
VRS Castricum | 2 October | |||
| 2015 | |
VRS Castricum | 22 April | |
VRS Castricum | 8 September | |||
| 2014 | |
VRS Castricum | 30 May | |
VRS Castricum | 28 September | |||
| 2013 | |
VRS Castricum | 16 May | |
VRS Castricum | 27 September | |||
| 2012 | |
VRS Castricum | 13 April | |
VRS Castricum | 16 September | |||
| 2011 | |
VRS Castricum | 2 April | |
VRS Castricum | 24 September | |||
| 2010 | |
VRS Castricum | 7 April | |
VRS Castricum | 22 September | |||
| 2009 | |
VRS Castricum | 5 June | |
VRS Castricum | 14 September | |||
| 2008 | |
VRS Castricum | 4 April | |
VRS Castricum | 27 September | |||
| 2007 | |
VRS Castricum | 15 July | |
VRS Castricum | 12 September | |||
| 2006 | |
VRS Castricum | 11 June | |
VRS Castricum | 9 October | |||
| 2005 | |
VRS Castricum | 7 July | |
VRS Castricum | 11 October | |||
| 2004 | |
VRS Castricum | 24 April | |
VRS Castricum | 20 October | |||
| 2003 | |
VRS Castricum | 16 April | |
VRS Castricum | 12 September | |||
| 2002 | |
VRS Castricum | 20 April | |
VRS Castricum | 19 September | |||
| 2001 | |
VRS Castricum | 19 July | |
VRS Castricum | 7 October | |||
| 2000 | |
VRS Castricum | 27 July | |
VRS Castricum | 22 September |
