Running Races in San Francisco

The SF Marathon is one of the few marathons in the country that gets to run across the Golden Gate Bridge, and it can only do so because the race starts at first light and clears the bridge before it reopens to regular traffic. That puts real pressure on the back of the field to hold pace through the early miles or risk getting rerouted off the bridge before the closure window ends.

Course marshals in SF enforce cutoff times more strictly on the hillier stretches for the same reason. A course that closes roads block by block across a hilly city cannot hold those closures open indefinitely the way a flatter, more compact course can.

Bay to Breakers packs tens of thousands of entrants into corrals stretching for blocks along the start on Howard Street, and because a large share of that field is walking, dancing, or towing a keg rather than racing, anyone chasing a real time needs to seed into the front corral well before the gun rather than count on finding passing room once the race starts.

The rest of the SF calendar swings the other direction. The Kaiser Permanente SF Half runs each winter through Golden Gate Park and along the Great Highway, net downhill and built for a fast time, a sharp contrast to the costume first energy of Bay to Breakers a few months later.