WeBS counters were asked to complete counts on the priority dates listed below. If they were unable to count at this time they were asked to select the nearest suitable alternative date in that month.
Where tidal conditions at coastal sites were unfavourable on these dates, Local Organisers were encouraged to agree alternative dates.
| 2023 | ||
|---|---|---|
| 22nd January | 19th February | 12th March |
| 23rd April | 21st May | 18th June |
| 9th July | 20th August | 17th September |
| 15th October | 19th November | 17th December |
| 2022 | ||
| 23rd January | 20th February | 20th March |
| 17th April | 15th May | 19th June |
| 17th July | 14th August | 11th September |
| 9th October | 13th November | 11th December |
| 2021 | ||
| 17th January | 14th February | 14th March |
| 11th April | 23rd May | 13th June |
| 25th July | 22nd August | 12th September |
| 10th October | 7th November | 19th December |
| 2020 | ||
| 12th January | 9th February | 8th March |
| 12th April | 10th May | 7th June |
| 5th July | 23rd August | 20th September |
| 18th October | 15th November | 13th December |
| 2019 | ||
| 20th January | 17th February | 24th March |
| 21st April | 19th May | 16th June |
| 7th July | 4th August | 15th September |
| 13th October | 17th November | 15th December |
| 2018 | ||
| 21st January | 18th February | 18th March |
| 15th April | 20th May | 17th June |
| 15th July | 12th August | 9th September |
| 14th October | 11th November | 9th December |
| 2017 | ||
| 15th January | 12th February | 12th March |
| 9th April | 14th May | 11th June |
| 23rd July | 13th August | 10th September |
| 8th October | 19th November | 10th December |
| 2016 | ||
| 17th January | 21st February | 13th March |
| 10th April | 8th May | 5th June |
| 24th July | 21st August | 18th September |
| 16th October | 13th November | 18th December |
| 2015 | ||
| 18th January | 8th February | 8th March |
| 19th April | 17th May | 14th June |
| 19th July | 16th August | 13th September |
| 18th October | 15th November | 13th December |
| 2014 | ||
| 19th January | 16th February | 16th March |
| 20th April | 18th May | 15th June |
| 13th July | 10th August | 7th September |
| 12th October | 9th November | 7th December |
| 2013 | ||
| 13th January | 10th February | 10th March |
| 14th April | 12th May | 23rd June |
| 21st July | 25th August | 22nd September |
| 13th October | 10th November | 15th December |
| 2012 | ||
| 15th January | 12th February | 11th March |
| 8th April | 20th May | 24th June |
| 22nd July | 19th August | 16th September |
| 14th October | 18th November | 16th December |
| 2011 | ||
| 16th January | 13th February | 13th March |
| 17th April | 15th May | 12th June |
| 17th July | 14th August | 18th September |
| 16th October | 20th November | 18th December |
| 2010 | ||
| 17th January | 21st February | 14th March |
| 18th April | 16th May | 20th June |
| 18th July | 15th August | 19th September |
| 10th October | 14th November | 19th December |
| 2009 | ||
| 18th January | 22nd February | 15th March |
| 19th April | 10th May | 14th June |
| 12th July | 23rd August | 20th September |
| 11th October | 22nd November | 20th December |
| 2008 | ||
| 13th January | 10th February | 9th March |
| 6th April | 18th May | 22nd June |
| 20th July | 17th August | 14th September |
| 19th October | 16th November | 14th December |
| 2007 | ||
| 21st January | 18th February | 18th March |
| 15th April | 13th May | 17th June |
| 15th July | 12th August | 16th September |
| 7th October | 11th November | 9th December |
| 2006 | ||
| 15th January | 12th February | 12th March |
| 9th April | 14th May | 11th June |
| 16th July | 13th August | 17th September |
| 8th October | 19th November | 17th December |
| 2005 | ||
| 16th January | 13th February | 13th March |
| 10th April | 8th May | 26th June |
| 24th July | 21st August | 18th September |
| 16th October | 6th November | 4th December |
| 2004 | ||
| 25th January | 22th February | 21st March |
| 25th April | 23rd May | 20th June |
| 18th July | 22nd August | 19th September |
| 17th October | 14th November | 12th December |
| 2003 | ||
| 5th January | 16th February | 23rd March |
| 20th April | 18th May | 15th June |
| 20th July | 17th August | 14th September |
| 12th October | 16th November | 14th December |
| 2002 | ||
| 13th January | 10th February | 3rd March |
| 14th April | 12th May | 9th June |
| 14th July | 11th August | 8th September |
| 6th October | 17th November | 8th December |
| 2001 | ||
| 14th January | 11th February | 11th March |
| 8th April | 27th May | 24th June |
| 22nd July | 19th August | 16th September |
| 7th October | 4th November | 16th December |
| 2000 | ||
| 16th January | 13th February | 12th March |
| 9th April | 7th May | 25th June |
| 23rd July | 20th August | 17th September |
| 22nd October | 19th November | 17th December |
| 1999 | ||
| 3rd January | 21st February | 21st March |
| 18th April | 16th May | 13th June |
| 18th July | 15th August | 12th September |
| 10th October | 28th November | 26th December |
| 1998 | ||
| 18th January | 15th February | 15th March |
| 26th April | 17th May | 14th June |
| 12th July | 9th August | 6th September |
| 11th October | 8th November | 6th December |