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Name:Mynydd Tynewydd [Mynydd Ystradffernol]
Hill number:3538
Height:518m / 1699ft
Parent (Ma):2288  Craig y Llyn
RHB Section:32C: Neath to Chepstow
County/UA:Rhondda Cynon Taff
Catchment:Taff
Class:Dodd (500-599m), Dewey
(Tu,5,Dew)
Grid ref:SN 93684 00915
Summit feature:grassy hump in trees
Drop:32m
Col:486m  SN929021  
OS map sheet(s):(1:50k) 170
(1:25k) 166W
Observations:this ground is near OS spot height; ground 100m E at SN 93793 00912 may be as high
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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 53 users, only the latest 50 shown - Show all)ByDate of Ascent
Mynydd Tynewydd (Mynydd Ystradffernol) > Hirwaun Common from GR: SN 92222 02082ronaldo33329/05/2023
Mynydd Tynewydd (Mynydd Ystradffernol) > Hirwaun Common from GR: SN 92222 02082Hippster29/05/2023
Parked in picnic area, well trodden route to wide forest track which followed to bend to the WSW of top. Up a trod to narrow fire break with yellow ribbons then right at firebreak junction and into trees for top. Much easier than expected.PeterD18/11/2022
Forest road then path along firebreak. Much easier than expected. Solo.Dangerous Dave25/11/2021
From the picnic area at SN 922 020, along the forest road and then up forest rides as others to Mynydd Tynewydd. Then along forest/wind farm roads to SN 942 032 and along rough grassy track to Hirwaun Common. WSW back to forest tracks and main road.PGCE02/04/2021
1/6 Dewey day. From the picnic area at SN 922 020, along the forest road and then up forest rides as others to Mynydd Tynewydd. Then along forest/wind farm roads to SN 942 032 and along rough grassy track to Hirwaun Common. From there back to the main wind farm road to the A4061 at SN 922 027. Made the mistake of trying to follow FP diagonally over open area. A combination of huge tussocks, burnt heather and very wet underfoot made this section very unpleasant, until decent track along the escarpment edge met, then easy going along edge with short diversion to locate the Trig at the summit of Craig y Llyn. Returned to the car easily via wind farm road. 17km with 350m ascent in 4 hours. (S)silveracorn_alan22/07/2020
Circular walk taking in Hirwaun Common, Mynydd Tynewydd [Mynydd Ystradffernol],Craig y Llyn & Craig y Llyn (boundary)Arbie23/03/2020
Parked at 92250 02087 the car park was closed for some reason but still plenty of space for several cars in front of the barrier. Followed forest roads to the turbine directly north of top and used fire breaks to reach the summit, One hour 15 minutes for just over Four miles.WAYNE ROWLETT21/03/2020
Treherbert - Craig y Llyn - Craig y Llyn (boundary) - Mynydd Tynewydd - Treherbert.Mark Jackson08/02/2020
Started at 924019 - in via wide track - also followed GerryBowes directions below and found them spot on - tawychwood19/04/2019
From 925018. Very wide track. Made good use of bike and GPS. Can’t beat modern technology.Campbell Singer01/09/2018
From the picnic car park at the head of Cwm Rhondda off the A 4061. Took a track east into the forest, then forest road south to its end past wind turbines. Then hard-going south in a wide break in the trees past a fallen tree,and then firebreak west to the twin tops. Returned the same way. With MP and AW.Man of Kernow125/08/2018
Gerrybowes directions spot on. 2.39 miles 44 mins.clivevilla14/03/2018
Parked in entrance to forest track at 925018 - SSE along good track to bend at 934008 - ENE across tussocks & then along firebreak - At firebreak junction, turned right & then a short distance along firebreak to the summit hump which lies a few yards into the trees. (S)gerrybowes02/02/2018
A tricky one to reach or at least I made hard work of it. Walked up from the car park to NE first on a track to the ridge then S along the ridge on wind farm roads but then the road stopped just by one of the turbines after which it was a slog as Jon says over rough ground and W down a firebreak to the high point. Returned to the ridge and onwards S to the trig point which I also made a mess of finding.Father Ted02/05/2017
From the Hen Dre'r Mynydd car park on A4061. 8 mile circular walk to do Hirwaun Common and 2 x trig pillars also. FP and wind farm roads initially then into conifer plantation for a slog - not particularly pleasant, but then neither is walking under massive wind turbines in full speed mode. On to the eponymous trig pillar.jonglew11/01/2017
From road and along forest track. Not my favourite hill.Ramblingpaul29/11/2016
From road end out on forestry track then firebreak to rather undefined summit. Wandered further along as it looked higher (probably an illusion).SS15/03/2015
3/7 Climbed up from A4061 along right of way marked up but not kept well so would not advise anyone to do that route in summer. Summit is being felled and prepared for wind farm. Easy to locate beside wooden stockade at edge of cleared areaFergalh14/03/2015
Walked down to SE to A4061. All part of a new wind farm. Followed forest road and then forest rides to summit. Summit quite easy to miss. It's hidden by trees to one side of the ride. Secondary summit mentioned looks to be artificial. Whole area becoming a building site (wind farm?).MikeM27/02/2015
From picnic area, followed forest tracks and then yomb.rhalstead19/05/2014
picnic area, followed trail of litter toward wind turbines, unsure if got highest point.dicky08/06/2013
Start ~ Car park at 923019steve hudson18/02/2013
Car park to NW. Then forestry road to 350m of top. Easy fire breaks to top. Alternative top could possibly be higher.destaylor31/01/2013
This was a right slog, also took in Hirwaun Common from the Picnic Site. Lots of snow underfoot along the forest rides. Glad I had GPS to locate the high point. However the paper map was invaluable to navigate through the forest. Some of the forest tracks were flooded as well as having lots of discarded Strongbow Cans.isabelle05/11/2012
After triangulation point I reached what I think was the high point. Could be a burial mound?Dusty22/04/2009
been to this one twice to visit both the summits the spot height is in the coniferous foresthodder13/05/2008
new Purchase summit is a fairly distinctive uplift in tussocky ride, complex to reach as not mapped on 25k Nov03. e.g. park 931002, climb steep slope S of crag to forest road, pick a ride E and pick a way to top RHW09/11/2003
davefh03/07/2022
Rob5002/06/2022
AlanD11/09/2021
chalky195319/09/2018
Adrian01/01/2018
TREBORK30/04/2016
underhill03/10/2015
DARRENG06/06/2015
mae10/03/2014
Deedubr25/08/2013
Hetty24/03/2013
wombourne18/02/2013
Steve Q22/07/2012
MM05/11/2011
Moorponder27/07/2011
iaindbrown13/08/2010
Andy West22/07/2010
carole engel06/08/2009
Anton06/08/2009
BaggerGutt18/07/2008
AndyS23/09/2007
stevent080930/12/2006