While Marin County was poised to be the first Bay Area county since the deadly winter surge to move into the California's least restrictive yellow tier on Tuesday, the day didn't didn't pan out as expected.
Marin County Health Officer Dr. Matt Willis confirmed the news to the county's Board of Supervisors on Tuesday, adding the earliest the county could now move to the yellow level is May 4, according to the San Francisco Chronicle.
Spring break travel is thought to have led to an increase in Marin's cases.
Only three counties - Lassen, Sierra and Alpine - are currently yellow.
San Francisco became the only Bay Area county to ever hit yellow in October, but it was moved to the purple tier along with the rest of the state as cases began to surge and the state temporarily shifted to a more restrictive, regional reopening model.
The yellow tier allows for a significant expansion of activities.
Bars could reopen for indoor service for the first time in 13 months without having to serve food. Movie theaters, gyms and places of worship would be able to operate at 50% capacity and live events can resume with assigned seating at 67% capacity.
In order to move to the least restrictive yellow tier, counties must have fewer than two new cases a day for every 100,000 residents and an adjusted case rate of below 2% for two weeks straight.
San Francisco, Santa Clara and San Mateo counties are also close to joining the yellow tier but likely will not move for another two weeks.