Sustainability of Florida citrus industry has become the biggest concern for growers due to widespread of Huanglongbing (HLB) in almost 100% of Florida orchards with no cure in sight. Some mandarin varieties, ‘LB8-9’ (Sugar Belle) and ‘Tango’, are tolerant against HLB as compared to sweet oranges and grapefruit cultivars. Mandarins are a fresh market produce, so uniform and attractive peel color must align with consumer expectations. Florida’s subtropical weather inhibits peel chlorophyll breakdown and the presence of HLB further exacerbates peel color development. To improve peel color and quality (thus marketability of fruit) of Florida grown mandarins, a study was conducted to evaluate how HLB symptomatic (S) and asymptomatic (AS) Sugar Belle and ‘Tango’ mandarin fruit respond to degreening treatment (5 µL L−1 ethylene at 25 °C and 85-90% relative humidity, for 72 or 96 h, respectively). Degreened and control fruit were stored at 24±1 °C and 80-85% relative humidity for 14 d with weekly evaluations. With degreening, fruit (AS and S) of Sugar Belle and ‘Tango’ attained lower peel hues and higher chroma (more orange and pure color) compared to untreated control, in a cultivar dependent manner. In both cultivars, S fruit retained higher peel hues (less orange) than AS fruit at harvest and during storage. S fruit also had reduced fruit size, weight, and peel thickness compared to AS fruit. At harvest, S fruit of both cultivars had higher compression forces, peel puncture resistance forces, sugars (glucose and sucrose), and citric acid than AS fruit. During storage, S fruit retained higher citric acid than AS fruit in both cultivars. With degreening, AS and S fruit from both cultivars had lower citric acid than non-treated control during storage. Upon sensory quality evaluation of Sugar Belle, lower sourness scores were recorded for degreened Sugar Belle fruit compared to untreated control irrespective of HLB fruit symptoms. Overall, degreening treatment enhanced peel color development without accelerating storage decay incidence or deteriorating fruit quality. This suggests that degreening treatment can be a potent industry tool for achieving marketable fruit peel color from HLB-affected mandarin trees grown in subtropical climates without altering the flavor of the fruit.