Butterfly Conservation
Saving butterflies, moths and our environment
Hampshire and
Isle of Wight Branch

UK Butterfly Monitoring Scheme Resources

Here is a helpful reminder of the start dates of transect weeks.

Transect walking start dates

The formal transect season starts on 1 April every year and continues until the end of September.

The day of the week on which transect weeks start (i.e. the day on which 1 April falls) normally moves ahead each year by one day, but by two days in a leap year. The table below gives the starting days of the transect week from 2018 to 2030.

Year 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
Weekday Sunday Monday Wednesday Thursday Friday Saturday Monday Tuesday Wednesday Thursday Saturday Sunday Monday

The actual start dates of each transect week remain the same from year to year. The next table gives these dates with the corresponding week number from 1 to 26.

Week no. 1 2 3 4 5 6 7 8 9 10 11 12 13
Date 1 April 8 April 15 April 22 April 29 April 6 May 13 May 20 May 27 May 3 June 10 June 17 June 24 June

Week no. 14 15 16 17 18 19 20 21 22 23 24 25 26
Date 1 July 8 July 15 July 22 July 29 July 5 August 12 August 19 August 26 August 2 Sept 9 Sept 16 Sept 23 Sept

Other resources for transect walkers


Copyright © Butterfly Conservation Hampshire and Isle of Wight Branch
Privacy and Copyright Statement
Butterfly Conservation: Company limited by guarantee, registered in England (2206468)
Registered Office: Manor Yard, East Lulworth, Wareham, Dorset, BH20 5QP, Tel: 01929 400 209
Charity registered in England & Wales (254937) and in Scotland (SCO39268)
Administrator Login