Askham Bog YWT


Site Details:

Recorders: David Firth + Richard Leatherly , Lizzie McFarlane Distance: 1200m Walk Time: 1hr

Askham Bog is small area of peat bog and Site of Special Scientific Interest situated within the Vale of York in North Yorkshire, England. It lies to the south-west of York, north of Copmanthorpe and near Askham Richard and Askham Bryan. It is regarded as one of the most ecologically diverse sites in Northern England.

Askham Bog is remarkable survivor of the ancient fenlands of Yorkshire. It occupies the site of an ancient lake, left behind by a retreating glacier 15,000 years ago - the low hill to the south of the Bog, along which the A64 road runs, is the terminal moraine from that glacier.

Dating back to Roman times Askham Bog was used by local communities as a source of peat for fuel, resulting in a mosaic of habitats and a legacy of ditches, probably originally used for peat extraction.

It was purchased by YWT in 1946 and restored to ts original state as a wildlife reserve

Magnificent royal ferns, rare gingerbread sedge and spectacular displays of water violets are to be found in this mosaic of fen, woodland and meadow.


S1 is largely wet woodland and section 2 3 and 4 are raised walkways with small meadow areas to their south and section 5 has meadow areas to its north. S6 is a more open meadow area while 7 and 8 are part raised walkway and rather shady

No section habitat details have been entered in UKBMS

Comma is seen in S6-8 while Gatekeeper tend to frequent S2, 5 and 6 . Whites are farely uniform across the site. The little meadows of S2-5 see large Skipper and Ringlet. Meadow Browns favour S2 and 6. Peacocks also favour the more open S6 along with Tortoiseshells. Small Skipper is most frequent in S4-5 while the shade loving Speckled Woods S7+8. The wall has been seeen on occasion lately in S5

2021 Results

Results are in line with other transects in 2021 with a poor showing from Small Skipper, Small White, Large White Red Admiral and particularly Comma , The two winners were Small Tortoiseshell and Gatekeeper along with Brimstone, Green-veined white and Orange tip. Meadow browns have been more common the last two years. Speckled wood also had a very poor year as in other transects. Overall numbers were down rather more than elsewhere but it is difficult to be sure due to lack of walks.

Transect reports 2020

2020 Results

2019 was always going to be a tough act to follow and numbers were slightly down after adding estimates for lockdown. Comma and Speckled wood and all the whites and Brimstone were down. However there were more Meadow Browns and a boom in Gatekeeper and Small Skipper and in common with all other transects Small Tortoiseshell had there best year for some time.