San Lorenzo River Trail Run
Race Day Weather
Warm and humid, slight breeze
Runners will face a temperature increase from 60°F at the start to 67°F by race end, with average humidity at 72% contributing to a muggy feel. Winds will be light from the W, maxing at 8 mph. Runners should consider starting conservatively due to the humidity and adjust their pace accordingly.
Pace Calculator
Get forecast alerts for San Lorenzo River Trail Run
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The San Lorenzo River Trail Run is an annual trail race in Santa Cruz, California, organized by Coastal Trail Runs. Held each July, it starts and finishes at Harvey West Park and offers 10K, Half Marathon, 30K, Marathon, and 50K distances, with the marathon run as two half-marathon loops. The course crosses the San Lorenzo River multiple times and passes through coastal redwood forest, stream canyons, and chaparral ridges toward Henry Cowell Redwoods State Park. Source
