In rugby, Scarlets became the third Welsh region to have their Magners League match in Ireland called off.
Defending champions Munster had laid protective covers at Musgrave Park and had a contingency plan in place to play Sunday's game at Thomond Park.
But despite the pitch itself being playable, surrounding areas remained in a precarious condition and in the interests of safety the decision was made by officials at 1000 GMT Saturday to call off the game.
Ospreys' trip to face Ulster at Ravenhill and Dragons away at the Sportsground against Connacht on Friday were both called off.
But Edinburgh ensured their Magners League match with Cardiff Blues at Murrayfield went ahead on Saturday evening despite the cold snap.
Cardiff fans try to beat freeze
Not one game in the Welsh Premiership and the Swalec Leagues escaped the big freeze.
In football, Cardiff City's home Championship match against Blackpool is the only major match involving a Welsh side to escape the freeze.
Members of the public joined in efforts to clear the area surrounding the Cardiff City Stadium to make it safe for fans, with the pitch protected by undersoil heating.
Newport County's FA Trophy second-round showdown with York City at Spytty Park was postponed and rearranged for Wednesday, 13 January.
Merthyr Tydfil's home Zamaretto League game with Brackley Town is also off.
Wrexham were without a game on Saturday, but their Blue Square Premier clash with Gateshead on Tuesday is off.
Sports pitches have been left frozen by the cold weather
The Tyneside club have been forced to move their FA Trophy match with Chippenham, rearranged after Saturday's tie was frozen off, to 12 January.
So Dean Saunders' men have suffered their sixth successive postponement.
New rugby league team South Wales Scorpions have been forced to call off a trial scheduled for Sunday at Treforest.
Not even indoor events remain safe. Welsh Athletics has cancelled the first indoor event of the year the 3000m senior Welsh championships and Under 13/15/17 open meeting in Cardiff due to travel problems.
The weekend's racing in Wales was called off as Ffos Las went the same way as Friday's race meeting at Bangor-on-Dee.
Ffos Las were set to enjoy its biggest day since opening in 2009 but the frosty ground meant the Saturday meeting was abandoned.
The Carmarthenshire course had been set for its first televised meeting which included the revived £50,000 Grade Two Welsh Champion Hurdle and the prestigious Grade One £35,000 Tolworth Hurdle.
Magners League: Ulster v Ospreys Connacht v Dragons
Welsh Premier League: Cefn Druids v Connah's Quay Llanelli v Port Talbot Welshpool Town v Aberystwyth Town
Principality Welsh Premiership: Carmarthen v Newport Ebbw Vale v Glamorgan Wanderers Llandovery v Pontypridd Swansea v Cardiff Aberavon v Pontypool Cross Keys v Llanelli
Swalec Leagues: All games postponed
FOOTBALL Championship Middlesbrough v Swansea City
FA Trophy: Newport County v York City
Zamaretto League Merthyr v Brackley
Unibond League Division One North FC Halifax Town v Colwyn Bay
Welsh Premier League: Bala Town v Newtown Caersws v Porthmadog Carmarthen v The New Saints Haverfordwest v Prestatyn Town Neath v Bangor City Rhyl v Airbus UK
RACING Ffos Las
INDOOR ATHLETICS 3000m senior Welsh championships Under 13/15/17 open meeting
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