Lower Trestles - surf spot statistics

Lower Trestles is a consistent surf spot with predominantly ground swell year-round, though the optimal conditions vary across seasons. The best months for surfing are typically from March through September, when ground swell occurrence is highest (82–96%) and swell size averages around 0.8–0.9m. However, wind conditions play a crucial role, with onshore winds (bad conditions) dominating most of the year. The most favorable wind conditions are found in September and October, when good wind percentages reach 40%, though even then, offshore winds remain a minority. Late spring and early summer (May–June) see the strongest swells (0.9m), but wind quality drops significantly (only 26% favorable). Winter months (November–February) offer slightly better wind ratios (32–36% good), but swell consistency and size decrease, with more no-swell or wind-swell days. Ultimately, September and October strike the best balance, combining reliable ground swells (89–95%) and the least unfavorable winds (40% good), while still maintaining decent swell heights around 0.7–0.8m. For surfers prioritizing clean conditions over raw swell size, these transitional months are the most dependable.

October at Lower Trestles offers consistent but generally smaller surf, with an average swell height of 0.7m and a solid 15s period, ensuring clean, well-spaced waves. The dominant swell directions are SSW (55.5% of waves in the 0.5-1m range) and SW (22.6% in the same range), providing favorable, angled energy for quality rides. Notably, 40% of wind conditions are ideal—typically light offshore or cross-offshore from the NE/ENE—keeping surfaces clean. However, WSW winds (6.0% at 10-20kph) can occasionally create choppier conditions. While bigger swells (1.5m+) are rare (under 0.5% occurrence), the spot’s consistency and shape make it reliable for performance surfing, especially when winds cooperate. Expect mostly waist-high to shoulder-high waves, with occasional bigger sets on strong SSW pulses. Advanced surfers will appreciate the long, rippable walls, though patience may be required for premier conditions.