Lace up for the ultimate urban challenge at the Fog City Run, a quintessential San Francisco 5K that promises both breathtaking views and a formidable test of endurance. Scheduled for Wednesday, May 20, 2026, this weekly institution offers a unique blend of competitive spirit and local charm, all kicking off from The Blue Light at 1979 Union Street. Runners will navigate a notoriously hilly 5K(ish) route through the picturesque Marina and Presidio neighborhoods, a course so challenging it's been dubbed the "Hardest 5k in San Francisco." Expect a diverse urban landscape with notable ascents, including the infamous Lyon Street Stairs, leading to a rewarding "top point of the course" before the finish.

Typical race day conditions in late May often feature highs around 64°F and lows near 52°F, with a minimal 2% chance of precipitation. Embrace the city's iconic maritime layer, as San Francisco is renowned for its "Fog City" moniker, with dense fog frequently rolling in from the Pacific, adding a mystical element to your run. This informal yet engaging event attracts a smaller, dedicated crowd, typically between 5-20 participants, fostering a close-knit atmosphere where competitive camaraderie thrives.

What makes the Fog City Run truly unique is its grassroots appeal and straightforward approach. Registration is a simple $5.00 cash upon arrival, and a locked closet is available for your belongings. While formal aid stations are not typically a feature of this community run, the unforgettable course, the stunning San Francisco scenery, and the satisfaction of conquering one of the city's toughest 5Ks make it a must-do for any runner seeking an authentic and challenging experience.