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Complete provisional period data was obtained for 46/51 jurisdictions. The effect of provisional period length categorized as 0 days (18 jurisdictions, 35.3%), 1 to 30 days (18 jurisdictions, 35.3%), 31+ days (10 jurisdictions, 19.6%), and "unclear" (5 jurisdictions with incomplete data, 9.8%) had no significant association with annual adolescent vaccination coverage for Tdap (p = 0.82), MCV4 (p = 0.08), and HPV (p = 0.76). Provisional policies may not increase vaccination coverage as anticipated. Unintended consequences, such as incre