San Francisco set for yellow tier upgrade next Friday San Francisco headed back to yellow tier next Friday City health officials say San Francisco's COVID cases are trending in the right direction and the county has met state health officials' criteria to move into the the yellow tier as soon as May 7. SAN FRANCISCO - In just the last month, San Francisco seemed poised to move to the yellow tier only to be disappointed as COVID rates stalled. Now the city's public health leaders can confidently say they are on the verge of moving to the yellow tier on May 7.