The promise of sun protection interventions relies on successfully disseminating them to new populations and settings with sufficient fidelity to be effective. Two methods for disseminating our evidence-based occupational sun protection intervention, Go Sun Smart at Work, were evaluated. Regional districts (n=138) from state Departments of Transportation (n=21) throughout the United States were randomized to two scalability methods in a randomized pretest-posttest two-group design. The in-person scalability method included in-person visits to the workplaces to meet with managers and deliver training to employees. The digital scalability method utilized low-cost virtual communication with managers and video training for employees. At posttest, managers (n=255) reported their program implementation actions while employees (n=1387) reported receipt of sun safety training/communication and protection practices. Nearly all managers reported implementing training, communication, and sun protection actions (>80.0%), but implementation did not differ by scalability method (training/communication: b=0.050, p=0.50; other actions: b=0.017, p=0.88). However, more employees reported sun protection training (b=0.381, p=0.02) and communication (b=0.112, p=0.049) from in-person than digital scalability method. Employee sun protection practices were unrelated to scalability method (protection practices: b=0.055, p=0.25). Both scalability strategies motivated managers to implement sun safety training and communication, and more than other sun safety actions, possibly because training/communication fit into existing safety training processes and communication channels and required few resources. In-person training is preferred by many workers and technological barriers may have interfered with digital training delivery. Restrictions placed on the workplaces due to the COVID-19 pandemic interfered with scalability, possibly biasing the result towards the null.