Browse episode ratings trends for Iolo's River Valleys. Simply click on the interactive rating graph to explore the best and worst of Iolo's River Valleys's 5 episodes.
Best Episodes of Iolo's River Valleys
Dee
S2 Ep4
7.0
27th May 2026
Iolo explores the stunning Dee valley, from wintering birds along the estuary, to displaying black grouse on moorland, rare freshwater-pearl mussels, and spawning sea trout.
Teifi
S2 Ep3
7.0
20th May 2026
Iolo explores the Teifi river valley, and finds a slow worm hunting, meets a coracle fisherman, is thrilled by a fishing Otter, and watches a pair of kestrels at their nest.
Worst Episodes of Iolo's River Valleys
The Rheidol Valley
S1 Ep1
6.0
6th May 2025
Iolo Williams explores the Rheidol valley and looks for elusive pine martens. He’s also treated to views of red kites nesting in a village and explores a remote zinc mine.
The Dyfi Valley
S1 Ep2
6.0
13th May 2025
Iolo Williams explores the Dyfi Valley, from Ynyslas dunes and Cors Fochno bog to Ospreys at Cors Dyfi and wild Beavers near Machynlleth.
Iolo's River Valleys Episode Guide
The Rheidol Valley
S1 Ep1
6.0
6th May 2025
Iolo Williams explores the Rheidol valley and looks for elusive pine martens. He’s also treated to views of red kites nesting in a village and explores a remote zinc mine.
The Dyfi Valley
S1 Ep2
6.0
13th May 2025
Iolo Williams explores the Dyfi Valley, from Ynyslas dunes and Cors Fochno bog to Ospreys at Cors Dyfi and wild Beavers near Machynlleth.
The Conwy Valley
S1 Ep3
6.0
20th May 2025
Iolo explores fascinating woodlands, searches for Curlew chicks and uncovers the history of an ancient burial chamber nestled in the beautiful Conwy Valley.
The Vale of Clwyd
S1 Ep4
6.0
27th May 2025
Iolo Williams explores the Vale of Clwyd, from coastal lizards and rare butterflies to a tame raven and elusive red squirrels, uncovering the valley's hidden wonders and wildlife.
The best rated episodes of Iolo's River Valleys are:
Dee S2E4 rated 7.0
Teifi S2E3 rated 7.0
The lowest rated episodes of Iolo's River Valleys are:
The Rheidol Valley S1E1 rated 6.0
The Dyfi Valley S1E2 rated 6.0
The first episode of Iolo's River Valleys aired on May 06, 2025.
The last episode of Iolo's River Valleys aired on May 27, 2025.
There are 5 episodes of Iolo's River Valleys.
There are 2 seasons of Iolo's River Valleys.
Yes.
Iolo's River Valleys is set to return for future episodes.
