Slateman Ultra (140.6) Triathlon

Slateman Ultra (140.6) Triathlon is a full iron-distance challenge in Caernarfon featuring a lake swim, mountainous cycling and a demanding trail run through Snowdonia.

Slateman Ultra (140.6) Triathlon takes place in Caernarfon, Gwynedd and is a full iron-distance event set in dramatic mountainous terrain.

Date: Sun 14 Jun 2026

Entry fees: £419.99 - £449.99

• Swim: 2.4 miles lake swimming
• Bike: 180 km road cycling + 2679 m ascent
• Run: 44.5 km trail running + 2126 m ascent

• Chip timing
• Online entry
• Hilly and mountainous route
• Minimum age: 19+