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Name:Pen y Boncyn Trefeilw
Hill number:2110
Height:646m / 2119ft
Parent (Ma):19413  Foel Cedig
RHB Section:30E: Bala to Welshpool
Nuttall/Wainwright area:The Berwyns
County/UA:Gwynedd (CoU)
Catchment:Catchment Boundaries, Dee (Flint), Severn
Watershed:Severn Estuary, Cardiff to Cape Wrath, Liverpool Bay
Class:Simm, Hewitt, Nuttall, Buxton & Lewis, Bridge
(Tu,Sim,Hew,N,BL,Bg)
Grid ref:SH 96235 28322
Summit feature:cairn on grassy knoll in field
Drop:57m
Col:589m  SH973278  
OS map sheet(s):(1:50k) 125
(1:25k) OL23E
Observations:about 10cm higher than pile of stones 38m away at SH 96265 28345
Survey:Abney level
GPS data:show GPS entries for this hill

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N.B. Some hill summits are on private property or on land where there is no public right of way.  Permission should be sought from the landowner where access to a hill summit is through private land.
Please report via the contact page any logs you see below which describe or encourage acts of trespass, and mention the hill number and hill name.

Logged Descriptions  (logged by 308 users, only the latest 50 shown - Show all)ByDate of Ascent
Nuttall route 7.5Neil Midgley17/09/2019
Two day hillbagging and wildcamp trip from Hirnant pass.Taz3806/08/2019
from quarry hirnant then nutall route inc foel cedig and deleted nutalls and other minor tops back through penllyn forest 9 hrsunderhill24/05/2019
From Bala to Lake Vyrnwy Road SH94604 27326, via Pen y Cerrig Duon, Then onto Stac Rhos, Cefn Gwyntog north top, Cefn Gwyntog, Cyrniau Nod, Y Groes Fagl & Foel Credig. Return via mountain track.Westdenewalker29/04/2019
On the return from Foel CedigColin Crawford31/03/2019
Pen y cerrig duon, pen y boncyn trefeilw, stac rhos, Foel cedig, cryniau nod, Y groes fagl. Missed out Cefn Gwyntog, as the heather and soft ground was hard going. Bagged 4 Nutalls.noxibis27/03/2019
followed path most of the was the heather was tough solocolinfielding28/02/2019
From Pen y Cerrig Duon. On to Stac Rhos via easy grass slope.Wycombe Wanderer24/11/2018
With SG from car parking at col to SW.Smudge24/11/2018
Bagged after Foel Cedig and some of those strange Nuttall things.Gill24/11/2018
Parked at the Hirnant Pass and took in in Pen y Boncyn Trefeilw and Foel Cedig,before returning to the car and climbing Foel y Geifr.Sprog29/09/2018
Foel Cedig > Y Groes Fagl > Trum y Sarn > Cyrniau Nod > Cyrniau Nod South-East Top > Cyrniau Nod > Pen y Boncyn Trefeilw > Pen y Boncyn Trefeilw SW Top > Pen y Cerrig Duon from GR: SH 94614 27328ronaldo33322/09/2018
Foel Cedig > Y Groes Fagl > Trum y Sarn > Cyrniau Nod > Cyrniau Nod South-East Top > Cyrniau Nod > Pen y Boncyn Trefeilw > Pen y Boncyn Trefeilw SW Top > Pen y Cerrig Duon from GR: SH 94614 27328Hippster22/09/2018
From Foel Cedig. Took the ridge track west and up to the flat summit area. Who knows which peat hag is the highest? Descended into Cwm Hirnant by deteriorated track down north ridge of Pen y Cerrig Duon. Solo.Man of Kernow129/08/2018
Repeatchalky195328/08/2018
From summit of Bala road: Pen y Boncyn Trefeilw / Stac Rhos / Y Groes Fagl / Cyrniau Nod / Cefn Gwyntog. Then: Foel y Geifr / Trum y Gwragedd / Foel Goch. Sunny.Winterfloodian26/07/2018
From top of Hirnant passDewi Prysor24/07/2018
Followed the Nuttall's route. Lovely sunny day with a nice cool breeze.Herbert Anchovy23/06/2018
A selection of Berwyns in company of (for some) Lindsay. Tops I completed were Pen y Boncyn Trefeilw, Stac Rhos, Cefn Gwyntog, Foel Cedig and Y Groes Fagl.knarf14/01/2018
Parked at start of track 946273. Weather: crystal clear, sharp frost and light wind - a complete contrast to the previous day when it was so windy I could hardly open the car door at the same spot!MichaelF24/11/2017
With Val. Good weather. Parked at pass above Cwm Hirnant. Went to summit on the way back to the car after going to Cyrniau Nod.mike.hoult08/08/2017
2/11 (Pen Y Cerrig Duon/Pen y Boncyn Trefeilw/Stac Rhos/Cyrniau Nod/Y Groes Fagl/Penllyn Forest Top/Foel y Geifir/Cefn Gwyntog North Top/Cefn Gwyntog/Garreg Wen/Rhwngy Ddwynant)Fergalh17/06/2017
a round of mainly Nuttalls from The Hirmant Pass, 7.5, solo, on a blustery dayLou11/06/2017
Walked the route in section 7.5 of the Nuttalls book. Foel Goch, Trum y Gwragedd, Foel y Geifr , Pen y Boncyn Trefeilw, Stac Rhos, Cefn Gwyntog, Cyrniau Nod, Y Groes Fagl. People call these the boring Berwyns but I don't agree. How many of the hundreds of thousands who climb Snowdon and Cader Idris each year would persevere with this walk. It's a real challenge and there are some good views if the weather holds. A very steep descent to Foel Goch reminded me how unfit I've become. Great views at the top, could see Arenig Fawr, Aran Fawddy and Snowdon in the distance inbetween the snow showers. The summit of Trum y Gwragedd was tantalisingly 40 foot on the other side of a barb wire fence. I decided not to be a purist but as I walked on the guilt gnawed at me and, 200 metres later at a corner post, I decided to leave my backpack, cross over and go back to the summit. My gloves and trousers already had holes in them and I'm not sure I'd have risked it if I had been wearing new exptsharp21/03/2017
with rogerDarren-44318/02/2017
Solo walk during a weekend trip to Llangollen for a friend's Birthday. Aber Hirnant - Foel Cwm-Sian Llwyd - along ridge via all Nuttalls to Pen y Cerrig Duon - road - Foel y Geifr - north along ridge - steep descent by forest to road - road back to Aber Hirnant. A rather dull and heathery set of hills!AGWilliamson18/12/2016
With G. Mostly Nuttalls' Route from cattle grid at Bwlch yr Hwch > Foel Goch > Trum y Gwrgedd > Foel y Geifr > Pen y Cerrig Duon > Pen y Boncyn Trefeilw > Stac Rhos > Cefn Gwyntog (faint path from gate near Cefn Gwyntog N Top) > Cefn Gwyntog North Top > Cyrniau Nod > Y Groes Fagl > start via Cwm GwynRT197017/08/2016
KeithByTheC30/07/2016
Solo. From Pen y Cerrig Duon and then on to Stac RhosAimless Rambler29/05/2016
Cyrniau Nod, Y Groes Fagl, Stac Rhos, Pen y Bocyn Trefielw, Pen y Cerrig Duon.tim74720/04/2016
Nuttalls walk 7.5Crib Goch13/04/2016
14 mile hard circular walk from the cattle grid at the bottom of the pass, used ill-defined footpaths up onto Pen Y Boncyn Trefeilw, then along lane to Stac Rhos up the lane to Foel Cedig and Cyrniau Nod, back down taking the pretty much pathless ridge to Cefn Gwyntog, descended and forded the stream west above the waterfall, followed lane to road, then followed lane through forest up onto the moors, struggled through hideous pathless heather up onto Cefn Coch, then across more heather to Foel Y Geifr, then down little path onto Trum Y Gwrgedd and Foel Goch back down to car with half an hour of daylight left.DanTrig13/03/2016
With Cyrniau Nod and Jenxnordicstar28/12/2015
Nuttall Walk 7.5: Foel Goch [The Berwyns] - Trum y Gwragedd - Foel y Geifr - Pen y Cerrig Duon - Pen y Boncyn Trefeilw SW Top - Pen y Boncyn Trefeilw - Stac Rhos - Cefn Gwyntog North Top - Cefn Gwyntog - Cyrniau Nod - Y Groes Faglronaldo33314/06/2015
Nuttall walkRuth09/09/2014
Followed the Nuttalls route apart from Stac Rhos, Cefn Gwyntog, Cyrniau Nod all done as out and back from the track. Each with a handy cairn to indicate where to leave the track. Latter part of the day it poured with rain and cloud came down.axe.stephen28/05/2014
From top of Bwlch Hirnant on route to Y Groes Fagl. Searched in vain for the boundary marker: even tried again from a different direction on the way back. But I convinced myself I'd found the summit, and a quick check of photos on return confirms that I had (twice!)ruthatlast26/05/2014
After the slog fest through the bogfest earlier to Bag Cyrniau nod and then Cefn Gwyntog and Stac Rhos this was a short walk from the track that meanders past. I took a photo of the summit cairn on an isolated bit of a grass topped peat mound. I did explore other possibilities but the cairn shown in the photo does appear to be the correct one.Dazingdale06/05/2014
Followed Nuttalls Western Berwyns walk with a few additions.rhalstead16/03/2014
MAINLY FOLLOWED NUTTALLS WALK 7.5 FOR THE WESTERN BERWYNS. PARKED AT THE FOOT OF THE HIRNANT PASS AND WENT STRAIGHT UP VERY STEEP FOEL GOCH, THEN EASY WALK ALONG THE RIDGE TO TRUM Y GWRAGEDD AND FOEL Y GEIFR. STEEP HEATHER DOWN TO TOP OF PASS THEN ALONG THE TRACK, POPPING OFF IT TO DO PEN Y BONCYN TREFEILW AND STAC RHOS. RETURNED TO TRACK BETWEEN ALL TOPS AND FOUND FAINT PATH OUT TO CEFN GWYNTOG. FOLLOWED FENCE TO CIRNIAU NOD AND FINISHED WITH THE EASY GROES FAGL. BACK THROUGH FOREST TO CAR - ANOTHER WARM SUNNY DAY OUT FROM BALA.BURGESS08/08/2013
Nine-Nuttall circuit clockwise from Aber Hirnant, with Ruthdavidpettit8405/05/2013
Thick wet snow made the going very hardbikechap20/03/2013
Parked at road/track junction at the foot of the Hirnant Pass - Track past Ystrad-y-groes up through Penllyn Forest - Bwlch y Groes-fagl - Y Groes Fagl - Cyrniau Nod - Cefn Gwyntog - N. along ridge to Boundary Stone - Stac Rhos - Pen y Boncyn Trefeilw - Path down N. ridge of Pen y Cerrig Duon - Car. (JL,PM,CM)gerrybowes08/11/2012
5th of 8 for the day.bolton08/11/2012
CJM08/11/2012
Rode my mountain bike along the forestry road and went on foot to the top. Many quad bikes and motorbikes use the forestry road. An E reg BSA bantam was one!johnjennison18/09/2011
Off the FC track - it really does become a friend doing the five peaks on this side of the pass.woodse02/07/2011
Northern Hirnants 2 days / 22 miles. Start Finish Bala Wild camp in heather, very windy Rhiwaedog-uwch-afon, Foel Goch, Foel y Geifr, Pen y Cerrig Duon, Pen y Boncyn Trefeilw, Foel Cedig, Bwich y Gross-fagl, Foel Cwn-Sian,fellowsa20/05/2011
1st proper peak of the day. Good views of the Aran. Enjoy the grass while it's there!huwthomas14/05/2011
Small Cairn.Route:Drove into forest as far as Stac Rhos then walked-Pen y Boncyn Trefeilw-Stac Rhos-Cefn Gwyntog-Cyrniau Nod-Y Groes Fagl. V Dif deep heather. Sunny.Chris Williams28/04/2011