Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 28 May | |||||
| 2022 | Cap Gris-Nez | 7 March | Cap Gris-Nez | 2 September | |||||
| 2021 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 27 October | |||||
| 2019 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 12 May | |||||
| 2018 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 14 May | |||||
| 2017 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 3 October | |||||
| 2016 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 22 October | |||||
| 2015 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 1 November | |||||
| 2014 | Cap Gris-Nez | 2 March | Cap Gris-Nez | 31 October | |||||
| 2013 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 5 October | |||||
| 2012 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 5 May | |||||
| 2011 | Cap Gris-Nez | 16 March | Cap Gris-Nez | 12 October | |||||
| 2010 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 25 October | |||||
| 2009 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 26 October | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 17 November | |||||
| 2006 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 9 October | |||||
| 2005 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 20 November |
