Sonoma Raceway will host the 28th annual NHRA Sonoma Nationals Mello Yello Drag Racing event this weekend, July 31-Aug. 2.

Traffic on the surrounding roadways may be impacted, particularly the two-lane stretches of Highways 37 and 121. The raceway expects traffic to be most affected during the following days/times:

  • Friday, July 31: Exiting traffic between 8 p.m.-10 p.m.
  • Saturday, Aug. 1: Exiting traffic between 4 p.m.-7 p.m.
  • Sunday, Aug. 2: Between 10 a.m.-7 p.m.

The heaviest traffic is expected on Sunday, and race fans heading to the track are advised to arrive early to avoid traffic and enjoy the complete race-day experience.

A primary focus is to encourage non-race attendees to utilize alternative routes in and out of the Napa and Sonoma Valleys.  In past years, up to 85% of the drivers passing the raceway on Highways 37 and 121 during peak entry and exit times are not attending the event. When combined with race traffic, the results can bring hours of congestion for all drivers.

In addition, to ensure sufficient parking for its disabled guests, Sonoma Raceway will continue to work with the Sonoma County Sheriff's Office on a stringent placard check.  Sheriffs will check each car and driver for its Handicap Placard, matching paperwork with name and placard number and a valid Driver's License. Persons displaying fake or placards that are not their own will be fined, ticketed and required to appear in court. For more information about the NHRA Sonoma Nationals event weekend, visit or call 800-870-RACE.