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.

In May, Backdoor offers surfable conditions with an average swell height of 1.3m and a solid period of 10.4s, suggesting consistent, well-formed waves. The swell is predominantly from the north to northeast, with NNE (18.01%), NE (14.43%), and NNW (8.35%) contributing the most waves in the 1-1.5m range, occasionally reaching up to 2.5m. This directionality aligns well with the break, creating rideable walls and barrels when winds cooperate. However, wind conditions are less favorable, with only 21% of days offering ideal offshore or light cross-shore winds (mostly from the northeastern quadrant). The predominant winds blow from the N to NW at 10-30kph, which can create choppy or bumpy surfaces, especially when stronger W or NW winds prevail. The best sessions will likely occur during lighter NNE or NE winds, which coincide with cleaner, groomed faces. While not epic, May provides decent opportunities for experienced surfers who can handle occasional wind texture and variable sizes.