Los Angeles County Enters Yellow Tier Of Re-Opening Los Angeles County entered the yellow tier of re-opening on Thursday, allowing a slew of changes to allowed capacity for theme parks, bars and restaurants, according to Public Health officials. The Los Angeles County Health Officer Order was updated Wednesday to reflect newly permitted activities allowed in the yellow tier, beginning Thursday, May 6 at 12:01 a.m. Additional safety modifications are required or recommended for some sectors. The modifications to the Health Officer Order include the following: Amusement/Theme Parks/Fairs can increase capacity to 35%. Fully vaccinated out of state visitors are permitted.