| Date |
Event |
Location |
Organiser |
| January |
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| Sunday 17 January | DH Winter League Round 1 | Bree, Co. Wexford | Bree Racing |
| Saturday 30 January | Sperrin Duathalon Race 1 | Lough Fea, Cookstown | trilimits |
| Sunday 31 January | DH Winter League Round 2 | Cloon, Co. Wicklow | Epic MTB |
| February |
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| Sunday 14 February | DH Winter League Round 3 | Moneyscalp, Co. Down | Chain Reaction Cycles |
| Saturday 27 February | Sperrin Duathalon Race 2 | Lough Fea, Cookstown | trilimits |
| Sunday 28 February | DH Winter League Round 4 | Moneyscalp, Co. Down | Chain Reaction Cycles |
| March |
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| Sunday 14 March | G-Ride Full Irish 4X NPS Round 1 | TBC | TBC |
| Wednesday 17 March | St. Patrick's Day Duathalon | Glenshane Pass | More info |
| Saturday 27 March | Sperrin Duathalon Race 3 | Lough Fea, Cookstown | trilimits |
| April |
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| Sunday 4 April | DH NPS Round 1 | Cahir, Co. Tipperary | 021 Racing |
| Saturday 17 April |
Mid Ulster Duathlon Wicklow Adventure Race |
Magherfelt, Co. Derry Glendalough, Co. Wicklow |
triangletriathlon dublintri.com |
| Sunday 18 April | DH NPS Round 2 | Killarney, Co. Kerry | TBC |
| Sunday 25 April | Northwest Duathlon | Burnfoot, Co. Donegal | northwesttriclub |
| May |
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| Sunday 2 May | Laochra Árainn DH NPS Round 3 |
Árainn Mhór Island, Co. Donegal Dunmanway, Co. Cork |
arainnmhor 021 Racing |
| Saturday 8 May | Connemara Adventure Challenge | Connemara, Co. Galway | gaelforce |
| Sunday 9 May | G-Ride Full Irish 4X NPS Round 2 | TBC | TBC |
| Saturday 15 May |
Roe Valley Sprint Diamond Quest Ireland (CANCELLED) |
Limavady, Co. Derry Rostrevor, Co. Down |
triangletriathlon Diamond Quest |
| Sunday 16 May | DH NPS Round 4 | Cullahill, Co. Loais | CulloDH |
| Saturday 22 May | West Wicklow Roar 70 Wild Miles | Co. Wicklow Co. Fermanagh | Roar 70wildmiles |
| Sunday 30 May | Northwest Sprint/Liam Ball DH NPS Round 5 | Derry City, Co. Derry Cahir, Co. Tipperary | northwesttriclub 021 Racing |
| June |
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| Saturday 5 June | Crooked Lake Triathlon | Camlough, Co. Armagh | feilechamlocha |
| Sun-Fri 6-11 June | CelticXtreme - Multistage Adventure MTB Race | Ballyhoura Mountains | celticXtreme |
| Saturday 12 June | Dingle Adventure Race | Dingle | DAR |
| Sunday 13 June | Causeway Coast Triathlon DH NPS Round 6 | Portrush, Co. Antrim Co. Wicklow | triangletriathlon EPIC MTB |
| Saturday 19 June | Kilbroney Challenge Gaelforce 24hr Cycle Challenge | Mourne Mountains Mayo | kc gaelforce |
| Sunday 20 June | G-Ride Full Irish 4X NPS Round 3 | TBC | TBC |
| Sunday 27 June | DH NPS Round 7 | Clonmel, Co. Tipperary | Clonmel CC |
| July |
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| Saturday 3 July | Jog in the Bog | County Galway | Joginthebog |
| Saturday 10 July | Carlingford Lough Endurance Challenge ‘CLEC’ | Cooley Mountains, Carlingford | clec |
| Saturday 17 July | Muckno Mania Triathlon Rás na Ríochta - Adventure Racing |
Castleblayney, Co. Monaghan Co. Kerry |
mucknomania Cappanalea OEC |
| Sat, Sun 17,18 July | Irelands Coast to Coast | TBA | 26extreme |
| Saturday 24 July | Big Splash Triathlon | Portglenone, Co. Antrim | triangletriathlon |
| Sunday 25 July | Top Of The Mourne Triathlon DH NPS Round 8 | Rostrevor, Co. Down Carrick Mountain, Co. Wicklow | newrytriathlon Flow Racing |
| Saturday 31 July | Lough Neagh Triathlon | Ballyronan Marina, Co. Antrim | loughneaghtri |
| Sat, Sun 31 July, 1 Aug | The Beast of Ballyhoura | Cork, Limerick & Tipperary | Ballyhoura |
| August |
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| Sunday 1 August | City of Lisburn Triathlon Blackrock Challenge / Ballyhoura Blitz Wicklow Cycles Pump Action Cup 4X | Lisburn, Co. Antrim Limerick TBC | lisburncity Ballyhoura TBC |
| Saturday 7 August | Mourne Triathlon | Castlewellan, Co. Down | otcbelfast |
| Sunday 15 August | DH National Championships | Rostrevor | TBC |
| Saturday 21 August | Gaelforce West | Mayo | gaelforce |
| Sunday 22 August | Half Ireman / Ireman 226 Challenge | Groomsport, Co. Down | ireman |
| September |
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| Sunday 5 September | Stenaline Triathlon | Valley Leisure Centre, Co. Antrim | Newtownabbey DC |
| Saturday 11 September | Achill Roar | Mayo | Roar |
| Sunday 12 September | G-Ride Full Irish 4X NPS Round 4 | TBC | TBC |
| w/c 12 September | Race Around Ireland (Ultra Marathon) | Navan | RAI |
| October |
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| Fri-Sun 8-10 October | Cooley Raid | Carlingford | CCAR |
| Sunday 10 October | G-Ride Full Irish 4X NPS Round 5 | TBC | TBC |
| November |
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| December |
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