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Conwy to Porthmadog through Eryri: Route Guide

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Conwy Castle above the estuary
Photo: Nilfanion · CC BY-SA 4.0 · Wikimedia Commons

Journey from Conwy’s walls and quay through the rivers and mountain scenery of Betws-y-Coed and Llanberis, then continue to Caernarfon and Porthmadog. The route explores towns and lakeshores; summit walks, heritage trains and castle interiors need separate plans.

Conwy to Porthmadog through Eryri is a 100 km one-way journey (self-drive). It works best as a 5-day trip; the plan below is the 5-day version for June, built from 115 verified places, with planned transit times, opening hours and daylight checked.

5
days
100km
distance
5
Stops
115
curated stops

View ready-made plans 5-day plan · best time to go

The route

Conwy→ 26 kmBetws-y-Coed→ 27 kmLlanberis→ 12 kmCaernarfon→ 35 kmPorthmadog

What you'll see

Conwy castle
Enjoy sea views and green hills from historic stone walls.
Conwy
Dolwyddelan Castle
Gaze up at the imposing tower of an ancient fortress.
Betws-y-Coed
Dolbadarn castle ruins
Walk among the weathered stones of a majestic fort.
Llanberis
Caernarfon Castle
Explore imposing stone walls of this medieval fortress.
Caernarfon
Welsh Highland Heritage Railway
You will hear the whistle and feel the gentle rumble of a historic train winding through scenic Welsh landscapes.
Porthmadog
Conwy public walls-and-quay circuit
Walk a bounded circuit through Conwy's public walled-town streets and quay frontage. Castle and Plas Mawr interiors, full wall access, boat trips and guided activities require separate current confirmation.
Conwy
Betws-y-Coed public village-and-river circuit
Walk a bounded circuit through Betws-y-Coed's public village streets and confirmed-open river viewpoints. Forest trails, waterfall walks, railways, museums and adventure-provider activities remain optional.
Betws-y-Coed
Padarn Country Park
Hike through the grounds of a UNESCO-listed quarry.
Llanberis

Choose your length

5-day plan9 stops · 3.2 h transit1.8 stops/day · 0.6 h transit/daySee the full plan →

When to go

Best months: May, June, July, August, September

The mountain railway runs to the summit and the passes are clear — prime Snowdon weather, by Welsh standards.

See the month-by-month breakdown →

Similar journeys

View ready-made plans