A big-wave left reef on the outside of Guéthary harbour, Avalanche only wakes up when the Bay of Biscay is properly pumping, from 8ft and upward, with genuine outer-reef size reaching 20ft-plus on the right W-NW groundswell. SE offshores groom the long walls that flex and jack on the submerged reef, giving experienced surfers room to set up before muscular shoulders test rail-to-rail commitment. This is an expert-only wave: crowds are manageable precisely because the entry bar is high, though when it fires the local crew is well-acquainted and the pecking order is understood. Bottom: submerged rock reef. Season: Oct-Feb. Consistency: low. Bring a proper gun, 7ft-plus for paddle sessions, and do not underestimate the paddle from Guéthary harbour.
On smaller days within the working range, crowds are light to moderate and composed almost entirely of local regulars who know each other. The vibe is doable but not open-door: respect the hierarchy, wait your turn, and do not paddle out if you cannot handle the consequences of a heavy set. The wave self-selects.
Head to Guéthary town centre and follow signs to the harbour. Car park and restrooms are available. The terrace above the harbour offers a useful vantage point to read sets and judge conditions before paddling out. Water quality is clean with no pollution concerns.
When Avalanche is too big or flat, Les Alcyons offers a more accessible outer-reef left in the same bay. Parlementia, further along the Basque coast, handles similar swell and provides an alternative big-wave option when the swell direction favours it.
Forecast by Windy.app
