Backdoor - surf spot statistics

Backdoor in the United States offers consistent surf year-round, but the best conditions typically occur during the winter months, from November through February. During this period, ground swell dominates (76-88% of the time) with mean swell sizes ranging from 1.7 to 2.0 meters, providing powerful and clean waves. The downside is that wind conditions are less favorable, with bad winds occurring 52-64% of the time, but when the winds align, the surf is exceptional. Late fall (October) and early spring (December) also see strong ground swells (72-85%) and slightly improved wind conditions (44-48% good winds), making them solid alternatives. The summer months (May-August) bring smaller swells, primarily wind-driven, with lower mean sizes (1.1-1.3m), though July and August see slightly better wind conditions (38-41% good winds). September stands out as a transitional month with improving ground swell presence (37%) and the best wind odds year-round (51% good winds), offering a balance between swell quality and cleaner conditions. Overall, advanced surfers will prioritize the winter swell power, while those seeking more manageable waves and fewer crowds might prefer late fall or early spring sessions.

June at Backdoor delivers moderately consistent surf with an average swell height of 1.1m and a decent period of 9.5s, offering manageable but not particularly powerful waves. Swells predominantly arrive from the northeast quarter (NNE, NE, ENE), with the majority falling in the 0.5-2m range—ideal for intermediate surfers. Notably, 26.9% of ENE swells are in the 1-1.5m range, occasionally reaching 1.5-2m (6.22%). Cleaner conditions are limited, however, as only 31% of winds are favorable for surfing. Winds tend to blow from the north and northeast at 10-30kph, which can create choppy or cross-shore conditions. While June isn’t the most consistent month for epic surf, there are plenty of rideable days, especially when ENE swells align with lighter winds. Expect smaller, fatter waves early in the swell cycle and occasional punchier peaks when the period holds. Advanced surfers might find it underwhelming, but intermediates can still score fun sessions. Keep an eye on wind forecasts, as lighter NNE or variable winds will offer the best conditions.