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.

January at Lower Trestles sees a moderate swell height averaging 0.7m with a solid period of 14.1s, indicating clean and well-spaced waves. The primary swell directions are from the SW and WSW, with a notable concentration in the 0.5-2m range—ideal for performance surfing. While smaller waves (0.5-1m) dominate, there are consistent windows of larger, punchier waves (1-2.5m) offering better shape and power for advanced surfers. Wind conditions are favorable 36% of the time, typically light offshore or sideshore from the NE to E in the mornings, while stronger onshore winds from the W to WNW can disrupt sessions later in the day. The best days come when SW swells align with lighter winds, creating groomed, rippable walls. Overall, January delivers decent opportunities, but selectivity is key—target early sessions and watch for the optimal SW swell/Wind combo.