At a glance
Sheltered sandy bay on Holy Island, 3 miles south of Holyhead — Anglesey's leading sailing and water sports centre. Sandy coves divided by rocky outcrops and caves; clear water; sailing club; kayaking. Small holiday village with pub and café. South Stack RSPB 3 miles (puffins, choughs). Free beach, seasonal car park charges. LL65 2UN.
About Trearddur Bay
Trearddur Bay is Anglesey's most popular water sports destination — a sheltered sandy bay on the western coast of Holy Island, 3 miles south of Holyhead, where clear water, reliable winds, and rocky outcrops to explore have made it the home of serious sailing and kayaking on the island. Trearddur Bay Sailing Club (one of the oldest in Wales) runs racing throughout the summer season. The bay's sheltered position, with Holy Island's rocky headlands reducing open-sea swell, gives generally calm conditions that suit families and beginners as well as experienced sailors.
The beach is divided by rocky outcrops into several sandy pockets, each with its own character — the main family beach is gently shelving with clear water; the outer headlands have caves and deeper water for snorkelling. Grey seals are resident in the area year-round. South Stack RSPB reserve — one of Britain's most spectacular seabird colonies, with puffins, guillemots, razorbills, and choughs — is 3 miles north, making Trearddur Bay a natural base for a day combining beach and wildlife.
A small village with pub, café, and holiday cottages provides all necessary amenities. Free beach; seasonal car park charges. Holyhead station (London Euston ~3h15m direct) is 4 miles.
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Frequently asked questions
Trearddur Bay is the leading water sports centre in north-west Wales. The sheltered bay, with its consistent south-westerly winds funnelled around Holy Island and generally moderate wave height, is ideal for dinghy sailing — Trearddur Bay Sailing Club (founded in the 1920s) runs racing throughout the season and offers tuition. Kayaking and sea kayaking are popular, with caves and rocky coves to explore around the headlands at each end of the bay. The clear water (visibility can be several metres in calm conditions) makes it good for snorkelling, particularly around the rocky outcrops where wrasse, pollock, crabs, and occasional jellyfish are common. Stand-up paddleboarding has become increasingly popular. There is no commercial water sports hire operation at the bay itself, though equipment hire and tuition can be arranged through local operators and the sailing club.
Trearddur Bay occupies a distinctive niche among Anglesey beaches. It is more developed than the wilder beaches of the island's north and east coasts (Cemlyn, Lligwy, Traeth Bychan) — the village has hotels, pubs, restaurants, and a sailing infrastructure — but retains a relaxed, un-commercial character compared to the busiest mainland north Wales resorts. The water is typically clearer than the eastern Anglesey beaches (which can have more estuarial influence from the Menai Strait) and the sheltered position makes it calmer than the exposed western beaches (such as Rhosneigr). The bay is divided by rocky outcrops into several sandy pockets — each feels relatively private even when the overall beach is busy. For families who want reliable, clean water, some basic amenities, and the option of water sports, Trearddur Bay is the best-rounded Anglesey beach.
Holy Island (Ynys Gybi in Welsh) is a small island off the western coast of Anglesey, connected to the main island by two bridges — the Stanley Embankment (for road traffic, built 1823) and the Four Mile Bridge (an older, narrower crossing). Holy Island is about 6 miles by 4 miles and is home to Holyhead (the largest town on Anglesey and the main ferry port for Dublin), the dramatic coastal scenery of South Stack, Holyhead Mountain (the highest point, 220 m), and the beaches of Trearddur Bay and Rhoscolyn. The name "Holy Island" is the English translation of the Welsh Ynys Gybi — named for St Cybi, the 6th-century Celtic saint who founded a monastery within the Roman fort at Caer Gybi (Holyhead). The island has a concentration of prehistoric and early Christian monuments.
The coastal habitat around Trearddur Bay and Holy Island is rich in wildlife. South Stack RSPB reserve (3 miles north) is one of the most important seabird colonies in Wales — puffins, razorbills, guillemots, kittiwakes, and choughs breed on the dramatic cliff faces and can be viewed from the clifftop RSPB centre from April to August. The rocky outcrops and caves around Trearddur Bay itself support grey seals (present year-round, particularly in autumn when pups are born on quieter beaches), and dolphins and porpoises are occasionally seen offshore. Rock pooling around the headlands reveals blennies, shore crabs, hermit crabs, and starfish. The clifftop walks between Trearddur Bay and South Stack pass through heather and gorse heath, and choughs (the scarlet-billed member of the crow family that is the symbol of Wales) are regularly seen.
Yes — Trearddur Bay is one of the most family-friendly beaches in north-west Wales. The main sandy beach is gently shelving with generally calm water (due to the sheltered position), making it safe for young children to paddle and swim. The rocky outcrops at each end of the bay provide sheltered pools for rock pooling. The village has a pub, café, and the basic amenities that make a full beach day manageable. Parking is close to the beach. The bay is small enough that children can easily be supervised across most of the beach. For families staying in the Holyhead area or en route to or from the ferry, Trearddur Bay is by far the most attractive beach destination — the contrast with Holyhead's ferry port (a working industrial harbour) is striking, and the 3-mile drive separates two completely different environments.