Lace up for the ultimate urban challenge at the Fog City Run, a quintessential San Francisco 5K taking place on April 1, 2026. This isn't your average flat city sprint; renowned as potentially the "Hardest 5k in San Francisco," this weekly institution plunges runners into a dynamic "hilly 5km(ish) route" through the scenic Marina and Presidio neighborhoods. Prepare for a course that tests your mettle, featuring infamous ascents like the Lyon Street Stairs and numerous undulating streets leading to the course's top elevation point.

Runners gather at The Blue Light, located at 1979 Union Street in San Francisco's Cow Hollow, which serves as both the start and finish line. Embrace the unique, grassroots atmosphere of this long-standing weekly race, where registration is a casual $5 cash upon arrival. With typical race day conditions in early April presenting comfortable highs around 63°F and lows around 50°F, and only an 11% chance of precipitation, the weather is often ideal for tackling the challenging terrain. Secure your belongings in the available locked closet before taking on this competitive and memorable San Francisco experience.