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.

April at Backdoor offers decent surf conditions with an average swell height of 1.5m and a solid period of 11.5s, indicating well-formed, powerful waves. The dominant swell directions are NNE, NE, and NNW, contributing the most rideable waves in the 1-2.5m range, with NNW particularly delivering larger sets (18.45% of waves 1-1.5m and 7.69% 1.5-2m). Cross-shore or light onshore winds (under 20kph) from the NNE and NNW are most common, though only 17% of the time is the wind ideal (likely light/variable offshore). Stronger winds (>20kph) from the N, NNE, or WNW can create chop, and the spot is less tolerant of onshore E/SE winds. Expect a mix of small, playful days and occasional punchy, head-high+ sessions, particularly when the NNW swell aligns with lighter winds. Wind direction and consistency matter more than size—monitor for those cleaner NNE/NNW wind days for the best rides.