Shamrock Marathon Returns to Downtown Sacramento This Weekend

Caltrans warns of road closures and traffic impacts during the annual running event

Mar. 13, 2026 at 10:48pm

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Caltrans is alerting motorists about various road closures in downtown Sacramento this Saturday and Sunday for the Triumph Cancer Foundation's annual Shamrockn's 5K/10K and half marathon event. The Tower Bridge and several on- and off-ramps are scheduled to be closed during the event, which is expected to draw thousands of participants, spectators, and volunteers.

Why it matters

The Shamrock Marathon is a long-standing annual tradition in Sacramento, drawing large crowds to the downtown area. However, the road closures and increased pedestrian traffic can significantly impact commutes and travel in the city center over the weekend.

The details

Caltrans is urging motorists to exercise caution and avoid distractions when driving near the event route, as there will be numerous hydration and first aid stations set up along the course. Drivers are also encouraged to plan ahead and allow extra travel time to reach their destinations.

  • The road closures and event will take place this Saturday and Sunday, March 14-15, 2026.

The players

Caltrans District 3

The state transportation agency responsible for maintaining and operating 4,385 lane miles in 11 Sacramento Valley and Northern Sierra counties.

Triumph Cancer Foundation

The organizer of the annual Shamrockn's 5K/10K and half marathon event in downtown Sacramento.

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What’s next

Caltrans will provide real-time traffic updates and information on road closures through its social media channels and QuickMap app as the event weekend approaches.

The takeaway

The Shamrock Marathon is a highly anticipated annual event in Sacramento, but the associated road closures and increased pedestrian traffic can significantly impact commutes and travel in the downtown area over the weekend. Motorists are advised to plan ahead, allow extra time, and exercise caution when driving near the event route.