Sirona 100
14–15 August 2027
Price on organiser's site
Check the organiser's site for entry status
Race details
- Date
- 14–15 August 2027
- Location
- Barmouth, Gwynedd
- Region
- Wales
- Distances
- 100km, 100 miles
- Terrain
- Trail
About the race
A 100km or 100-mile ultra from Barmouth on the Mawddach estuary into the hills of southern Eryri. Expect mountain trail and coastal scenery.
Sirona 100 takes place on 14–15 August 2027 in Barmouth, Gwynedd, with 100km, 100 miles on offer.
Check the organiser's mandatory kit list and cut-off times before race day.
Location
Barmouth, Gwynedd
Listing checked October 2026. Something wrong? Tell us.
More nearby
Beacons Ultra
Ultra · Talybont-on-Usk, Powys
50 miles
Black Sheep Winter
Ultra · Llithfaen, Gwynedd
60km
Endurancelife Gower
Ultra · Oxwich, Swansea
34 miles
OTT Ultra Marathon
Ultra · Merthyr Tydfil
30 miles
Tour de Yr Wyddfa
Ultra · Llanberis, Gwynedd
44km
HAYUM by Pegasus
Ultra · Hay-on-Wye, Powys
30 miles
Endurancelife Pembrokeshire
Ultra · Haverfordwest, Pembrokeshire
35 miles
HOWUM by Pegasus
Ultra · Llanidloes, Powys
30 miles
Welsh 3000s Ultra Run
Ultra · Llanberis, Gwynedd
50km
Epona 100
Ultra · Abergavenny, Monmouthshire
100km · 100 miles
Ultra-Trail Snowdonia Eryri by UTMB
Ultra · Llanberis, Gwynedd
56km · 78km · 108km
CRANUM by Pegasus
Ultra · Aberystwyth, Ceredigion
30 miles