Pen y Boncyn Trefeilw
646m (2120ft)
The Berwyns, Snowdonia, Gwynedd, Wales
You can find Pen y Boncyn Trefeilw & all the walks that climb it on these unique free-to-access Interactive Walk Planning Maps: (click/TAP to select)
1:25,000 scale OS Explorer Map (the ones with orange/yellow covers):
1:50,000 scale OS Landranger Map (the ones with pink/magenta covers):
See Pen y Boncyn Trefeilw and the surrounding tops on our free-to-access 'Google Style' Peak Bagging Maps:
See Pen y Boncyn Trefeilw and the surrounding tops on our downloadable PDF Peak Bagging Map:
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Vital Statistics:
| Length: | 10.5ml (17km) |
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| Ascent: | 2,081ft (634m) |
| Time: | 6 hrs |
| Grade: |  (Moderate) |
Route Summary:
Hirnant Pass - Pen y Cerrig - Pen y Boncyn Trefeilw - Stac Rhos - Cefn Gwyntog - Foel Cedig - Cyrniau Nod - Y Groes Fagl - Pennllyn Forest - Ystrad-y-groes - Hirnant Pass
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Vital Statistics:
| Length: | 12.75ml (20.5km) |
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| Ascent: | 2,763ft (842m) |
| Time: | 7½ hrs |
| Grade: |  (Hard) |
Route Summary:
Hirnant Pass - Foel Goch (Berwyns) - Trum y Gwrgedd - Trum y Gwragedd - Foel y Geifr (Berwyns) - Pen y Cerrig Duon - Pen y Boncyn Trefeilw - Stac Rhos - Cefn Gwyntog - Foel Cedig - Cyrniau Nod - Y Groes Fagl - Pennllyn Forest - Ystrad-y-groes - Hirnant Pass
Fellow go4awalkers who have already walked, climbed, summited & bagged Pen y Boncyn Trefeilw
Stephanie Doyle walked up Pen y Boncyn Trefeilw on April 15th, 2023 [with] Friend [weather] Beautiful - Ok
Mark Davidson climbed Pen y Boncyn Trefeilw on July 3rd, 2006 [from/via/route] Walk gw120 The Western Berwyns from Hirnant Pass [with] Alone [weather] Nice & sunny
Donovan Suddell bagged Pen y Boncyn Trefeilw on April 1st, 2021 [from/via/route] GW120 [weather] Misty
Robert Taylor-Marriott hiked Pen y Boncyn Trefeilw on October 22nd, 2012 [from/via/route] Route 42: Pen y Boncyn Trefeilw & Stac Rhos (PBTSR). [with] Vince Wetton and Robert Taylor-Marriott. [weather] Cloudy.
David Lane summited Pen y Boncyn Trefeilw on December 2nd, 2006 [with] Kelly
Vince Wetton conquered Pen y Boncyn Trefeilw on October 22nd, 2012 [with] RTM [weather] Cloudy + Rain
Trevor Williams, Paul Booth and Richard Penney have all walked, climbed & bagged Pen y Boncyn Trefeilw.
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Send us your photographs and pictures on, of, or from Pen y Boncyn Trefeilw
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