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Name:Gyrn Ddu
Hill number:1952
Height:522.1m / 1713ft
RHB Section:30A: Anglesey and the Lleyn Peninsula
County/UA:Gwynedd (CoU)
Catchment:Minor Rivers only (South)
Watershed:Cardigan Bay
Class:Marilyn, Hump, Dodd (500-599m), Dewey, Clem
Grid ref:SH 40118 46788
Summit feature:cairn
Col:136m  SH387445  
OS map sheet(s):(1:50k) 115 123
(1:25k) 254
Survey:obvious summit/Trimble GeoXH 6000
Change log:show changes for this hill entry
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.  Please quote the hill number and hill name.

Logged Descriptions  (logged by 217 users, only the latest 50 shown - Show all)ByDate of Ascent
With Gareth from the Clynnog Fawr Road to the East of the hill. Gyrn Ddu first then Bwlch Mawr (and its handsome trig) on the way back.briandavies19/03/2020
From Gyrn Goch (village) via Gyrn Goch (the hill). Rough all the way.PeteN30/12/2019
From footpath (well, sort of) to south of mast on (very) minor road to east. Final section over boulders is unpleasant.lenman05/09/2019
Parked at the end of the row of terraced houses parallel to the main road to the East. Waymarked path past Rock Cottage zigzags up to the Bwlch and beyond. Go past a couple of walls until past all the rocky ridge and then turn left opposite a building through an iron gate. Follow sheep track up to just below summit. Last 30m of ascent scrambly over rocks to reach the summit. Returned same route.JulieB11/08/2019
From the entrance to Ynys Ddu farm found a footpath sign and stile then up by some broken down walls. Due to very limited visibility the boulder field came as a surprise. No views of course.NormanW12/07/2019
From gate at 397452 by obvious paths to access land and then direct line up. Scramble at top. Excellent viewpoint.trimarc210/10/2018
Snow down to sea level and minor roads impassable (yes, really, quite rare for the Lleyn), so the only possible starting point was Clynnog Fawr. The bridleway via Pen-yr-Allt-Uchaf would be pleasant in a drought; fortunately, the snow covered the swamp effectively on the way up. Not much path above the wall, and none at all crossing the Afon Hen, but the snow made light work of the bogs. Easier going with height, and knee deep snow towards the top. Generally, not as rough as expected, but very slow and tricky going up the summit boulder field, with many deep, snow covered holes to avoid. But all very spectacular, with splendid views. Thawing snow on the way down, once below 300 m, made for a trying descent, with several demonstrations of magnet arse. The vehicle track from the lower farm gave a drier route down.Gill08/03/2018
Me Alf and Darryl from Bwlch Mawrjrj27/10/2017
From Pen-llechog, CW over 6 hills, this the second, on the Gyrn Goch. Parking at entrance to Ynys Ddu Farm (SH 3971 4523). Lovely boulder field at top of this one.jonglew08/09/2017
2/4 (Gryn Goch/Gryn Ddu/FFrid Bach (Moel Ddu West Top/Moel Ddu)Fergalh13/08/2017
Anticlockwise route over 5 tops of the group. A very fine summit. Very rough going.stig_nest20/07/2017
Parked by the gate at SH397452 and walked tracks and rights of way to reach access land above Fron-heulog. Summit is a hill of large boulders needing scrambling to reach the cairn on the summit. Fantastic clear views over the Irish Sea from the top. Activated summit for SOTA on VHF with judy55cat.G4OBK (Phil)15/06/2017
#628 Traverse from east over Bwlch Mawrtim74707/06/2017
With Trefor. Climbed Bwlch Mawr first from the aerial to the east then across moorland to Gyrn Ddu. Returned via public footpath to the south. Good weather and great views.mike.hoult07/04/2017
Parked in the village of Llanhaerhaeren and then made my way up the tracks through the farms and onto the hill. The last part onto this peak is over boulders but there is no exposure, just need to watch your footing. Came down the way I went up over the boulders and then contoured around to Bwlch Mawr.Father Ted09/10/2016
A difficult 3hrs walk with Christopher H in cloud over the 3 tops of the Gyrn Ddu group. Hard to tell from the map but the top 20-30m is a big mound of stones. Paths are in short supply.Mark Jackson24/08/2016
Parked at end of farm track for Llethr-ddu then followed row to Fron-heulog. Straight ascent to Gryn Ddu with slippery boulder hopping at end. Descended east then north and up Gyrn Goch then back and round by walls to Bwlch Mawr (best 'stile' is 100m to west). Returned by row but diverted to take in Moel Bronmiod cutting down directly to Llthr-ddu on descent.SS07/08/2016
Circuit including Bwlch Mawr and Gyrn Goch. Started at 438475, followed path W in thick mist. Unfortunately mist did not clear, so no views from summit.JamesD197218/07/2016
A direct ascent from the mast at SH437478 bagging Bwlch Mawr,Gryn Ddu and Gyrn Goch.mad max12/07/2016
After a long trek unable to climb the very slippery boulders to the summit. Beware can be dangerous when wet.DDAY12/07/2016
Parked to west on A499, took path to the bwlch, then up the hill alongside the massive stone walls to the top.Cas-gwent25/05/2016
Early morning ascent whilst on a work visit to North Wales. Jogged up the Llethr Ddu track, and along a faint path by the wall. Stunning views of Llyn and Snowdon masif.huwthomas16/07/2015
Parked at end of farm track at SN39710 45239 (Room for 3 cars) Up farm track & path to deserted houses on waymarked track E along track, over stile & then up to gate in wall Steady climb to summit cairn On to Bwlch Mawr (JL)gerrybowes03/07/2015
With Jenx from the NE over the sub and tops around to the main summittnordicstar24/06/2015
after Bwlch Mawr in mist and drizzleThearlaichdubh20/06/2015
Here for Moel-Pen-llechog, so not much extra bother to nip up Gyrn Du again.Twice Shy21/04/2015
With Mark Trengove, Myrddyn Phillips and Andy Tomkins on a chilly, but colourful, January afternoon.Alex C17/01/2015
Continuation of walk from Gyrn Goch. descended south to bwlch, then up to minor east top of Gyrn Ddu. Then descended west to wide grassy bwlch, and up over rough boulders (a little scrambling) to summit. To descend, scrambled down to join west ridge, then down south to ruined houses, then track down past Penllechog farm to lane, then east back to car. With AT, AC and MP on a survey.Man of Kernow117/01/2015
With Mark T, Alex C and Myrddyn P.Sprog17/01/2015
With Sue - on a circuit from Clynnog Fawr on a good day. Ken and Anne didn't make it to the rocky summit.Phreerunner20/11/2014
Solo from 396453 to the rocky summit in windy but clear weather.bolton11/08/2014
Start ~ 405487.Used Row alongside the Afon Hen to gain the hillside before following the walls up to the summit of Gyrn Goch, a somewhat sporting ascent. Moved on to Gyrn Ddu and then walls and paths to Bwlch Mawr. All the summits are rocky with great views, took a direct descent to follow forest edge to meet outward route. With Wombourne.steve hudson21/04/2014
Parked at GR405487, room for several cars on section of old road. Set off on path alongside stream through wood with lots of bluebells in flower. Eventually out onto open hillside climbing very steeply alongside wall to Gyrn Goch then the rocky summit of Gyrn Ddu. Continued to Bwlch Mawr with good views out to sea. Made direct descent to edge of forest eventually joining outward route back to car. A dry, warm sunny day. With SH.wombourne21/04/2014
From the campsite at Llanaelhaearn which has a toilet in a shed (no shower) and very friendly owners. Walked passed abandoned houses which together with the rocky summit give this hill a wild feel. Good views of snowy Snowdonia.mindlessflogger07/04/2013
Bwlch Mawr, Gyrn Ddu and Gyrn Goch. Parked on A499 and ascended via the forest. Tough ascent of Bwlch Mawr with no path.clivevilla15/02/2013
With Mora, from minor road to EastBLACKHILL15/02/2013
From Clyfinog Fawr via Gyrn Goch.Dugswell218/09/2012
with Jamie while on CRMC AGM weekend. interesting clockwise cicuit starting with chat with owner of the lower house and woodlands, then with HuMP Bwlch Mawr, that ended with uncomfortable push through thickening increasingly high gorse on the lower NW slopesvegibagger05/05/2012
Parked on road to the south and then footpaths through to the open hillside. Four year old daughter walked the whole thing unaided while I carried my son. Nice rocky top and grand views.Herbert Anchovy14/04/2012
Rough ascent from the bwlch with Moel Pen-llechog. Then continued east to Bwlch Mawr.davidpettit8419/06/2011
Circuit from Clynnog Fawr with Bwlch Mawr and down via Gyrn Goch. Variable weather - no rain but both summits deep in cloud. Stone walls aid location of summits.nosdrahcir04/08/2010
From Tan-y-graig. Track most of the way. Hard walk.destaylor28/05/2009
Left car at 397453 (8:40) and walked up farm track and path to small house by E-W path. Up hill from there and back by same route, finishing 10:15. Lovely morning, good views. dbb26/04/2009
Squeezed car into a clear parking spot by Planwydd (395449) then up via Llether Ddu road keeping to ROW to access land. Rough bouldery hill feels like mountain summit- big views, too, impressive so close to the coast. To return we went 200m E of summit, then S to coast path (1 1/2 miles from coast here) and via Penllechog paths back. Fine weather, went to Morfa Nefyn after hill- another good day on Lleyn Peninsula.pwheeler16/03/2009
From S up lane near Penllechog. Fine rocky summit.Aye Jimmy30/01/2009