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BACKGROUND The primary objective of this study was to investigate the relative contributions of factors from multiple social-ecological levels in explaining outdoor play changes in childcare centers during the COVID-19 pandemic. METHODS In Alberta, Canada, licensed childcare center directors (n = 160) completed an online questionnaire. For outcomes, changes in the frequency and duration of outdoor play in childcare centers during COVID-19 compared to before COVID-19 were measured. For exposures, center demographic, director, parental, social, environmental, and policy-level factors were measured. Hierarchical regression analyses were conducted separately for winter (December-March) and nonwinter months (April-November). RESULTS In most instances, factors at each social-ecological level explained a statistically significant amount of unique variance in changes in outdoor play in childcare centers during COVID-19. Full models accounted for more than 26% of the variance in the outcomes. Changes in parental interest in outdoor play was the most consistent correlate of changes in the frequency and duration of outdoor play in both winter and nonwinter months during COVID-19. In terms of changes in the duration of outdoor play, social support from the provincial government, health authority, and licensing, and changes in the number of play areas in licensed outdoor play spaces were also consistent correlates in both winter and nonwinter months during COVID-19. CONCLUSIONS Factors from multiple social-ecological levels uniquely contributed to changes in outdoor play in childcare centers during the COVID-19 pandemic. Findings can help inform interventions and public health initiatives related to outdoor play in childcare centers during and after the ongoing pandemic.