Lower Trestles - surf spot statistics

Best Surf Season (November - February)

Lower Trestles hits its stride from late fall through mid-winter as the North Pacific rumble to life. The combination of powerful, long-period groundswells from the WSW and SW quadrants meets the highest frequency of offshore winds (N, NNE, NE) — peaking at 59% ideal conditions in December. These months deliver consistent 1-1.5m fun-to-solid waves with periods often exceeding 12 seconds, making for rippable A-frames and long walls. The occasional bigger episode from a bomb cyclone can push the reef into pumping 1.5-2.5m territory, though W-dominant swells still require some luck to align with the preferred southerly band.

Fair Surf Season (October & March)

Shoulder months offer a mixed bag. October sees a ramp-up in S/SSW swell energy (9% combined from S/SSW) and improving wind chances (36% ideal), while March retains a good supply of WSW and W swell (83% combined) but offshore wind reliability drops to 31%. These months can produce excellent days when a late-season cold front passes through, cleaning up the water and steering in long-period swell. Expect more variability — some days of clean, shoulder-high surf, others murky and onshore.

Low Surf Season (April - September)

From spring through early fall, Lower Trestles goes quiet. The North Pacific storm track shuts down and the predominant SW and WSW swell is often accompanied by persistent onshore flow from the S, SSW, SW, and WSW — the worst wind directions for this south-facing reef. Ideal wind percentages bottom out between 9% (June) and 14% (August). Swell heights average only 0.9-1.1m, mostly groveling 0.5-1m range, though the period remains surprisingly long (13-14s) thanks to distant Southern Hemisphere storms. The rare combination of a strong southern hemi groundswell with a coastal eddy or Santa Ana wind event can produce brief, fantastic sessions, but those are the exception, not the rule.

August: Hints of Fall, Still Marginal

August remains in the low season with an average swell height of 0.9m (the smallest) and period 13.6s. Swell is heavily SW (45.9%) and WSW (30.4%), with a touch of S/SSW (16.8%). Ideal wind inches up to 14% thanks to occasional N/NE breezes from early season cold fronts. The dominant onshore flow from WSW (27.0%) and W (20.6%) still rules. The 0.5-1m range accounts for 66% of swells, but the long period means those smaller waves have push. Keep an eye on tropical storms in the eastern Pacific — they can fire up late August with more southerly swell and lighter winds.