Pen y Boncyn Trefeilw
646m (2120ft)
The Berwyns, Snowdonia, Gwynedd, Wales
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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
See Pen y Boncyn Trefeilw and the surrounding tops on our free-to-access 'Google Style' Peak Bagging Maps:
The Berwyns of Snowdonia National Park
Less data - quicker to download
The Whole of Snowdonia National Park
More data - might take a little longer to download
See Pen y Boncyn Trefeilw and the surrounding tops on our downloadable Peak Bagging Map in PDF format:
NB: Whether you print off a copy or download it to your phone, this PDF Peak Baggers' Map might prove incredibly useful when your are up there on the tops and you cannot get a phone signal.
You can find Pen y Boncyn Trefeilw & all the walks that climb it on these unique free-to-access Interactive Walk Planning Maps:
1:25,000 scale OS Explorer Map (orange/yellow covers):
1:50,000 scale OS Landranger Map (pink/magenta covers):
Fellow go4awalkers who have already walked, climbed, summited & bagged Pen y Boncyn Trefeilw
Daniel Moran walked up Pen y Boncyn Trefeilw on April 23rd, 2025 [from/via/route] Caravan, drove to bala then down a single track road [with] Chel and Frankie [weather] WET AND MUGGY, - LOOP FROM THE NUTALLS BOOK WESTERN BERWYNS, MET A MAN ON TOP COMPLETED ALL THE 2000S
Christina Lander climbed Pen y Boncyn Trefeilw on July 30th, 2024 [from/via/route] Parking area next to the bridge by Foel y Ddinas on the Hirnant Pass - up the grassy ridge to Pen Cerrig Duon - Pen y Boncyn Trefeilw - Stac Rhos - Cefn Gwntog - Foel Cedig - Cyrniau Nod - Y Groes Fagl - through Penllyn Forest back to start [with] Dick [weather] A beautiful, hot sunny day - During our holiday staying at Y Gilfach, Bryn Melyn, Llandderfel
Stephanie Doyle bagged Pen y Boncyn Trefeilw on April 15th, 2023 [with] Friend [weather] Beautiful - Ok
Mark Davidson hiked 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 summited Pen y Boncyn Trefeilw on April 1st, 2021 [from/via/route] GW120 [weather] Misty
Robert Taylor-Marriott conquered 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 scaled Pen y Boncyn Trefeilw on December 2nd, 2006 [with] Kelly
Vince Wetton walked up 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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More Photographs & Pictures of views from, on or of Pen y Boncyn Trefeilw
Send us your photographs and pictures on, of, or from Pen y Boncyn Trefeilw
If you would like to add your walk photographs and pictures featuring views from, on or of Pen y Boncyn Trefeilw to this page, please send them as email attachments (configured for any computer) along with your name to:
and we shall do our best to publish them.
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