BackgroundIn recent years, Canadian provinces have been discussing, implementing, and tightening vaccination “mandate” policies for school enrolment. British Columbia (BC), Canada’s westernmost province, implemented a Vaccination Status Reporting Regulation (VSRR) in September 2019, which requires the vaccination status of children in public, private, and home schooling be reported to a provincial vaccination registry and education for parents who refuse to vaccinate. Legal vaccination mandates can carry the risk of backlash, thereby making it important to monitor public attitudes across policy implementation windows. The present study aimed to evaluate public support for this new provincial mandate following implementation. MethodsAn online panel of BC adults (n = 1301) was surveyed about 15 vaccine-promotion policy options in April 2020 following mandate implementation. Respondents were representative of the provincial population by gender, age, geographic residence, and percentage of households with children younger than 19 years of age. Poisson regression was used to estimate predictors of policy endorsement, and support for the VSRR. ResultsStrong support existed for the VSRR with 88.2% of respondents agreeing or strongly agreeing that parents should be required to provide their children’s immunization records at school entry, and 74.6% supporting required education sessions for parents who refuse to vaccinate their children. Overall, the sample was supportive of vaccination, and pro-vaccine attitudes were associated with strong agreement for nearly all vaccine policy options. Policies to impose rewards (e.g., tax credits) and penalties (e.g., fines) were the least likely to receive strong agreement from respondents. ConclusionsNear the end of the first school year in British Columbia subject to the Vaccination Status Reporting Regulation, support for both the mandated documentation and mandated education elements of the policy are high, and associated with pro-vaccine attitudes. There are not marked differences in strong support based on gender, age, parenting, education level, or income.