Objectives To pilot-test a mixed methods approach to evaluate tools and resources (TRs) that healthcare providers (HCPs) use for preventing childhood obesity in primary care, and report a preliminary descriptive assessment of commonly-used TRs. Methods This mixed methods study included individual, semi-structured interviews with purposefully-sampled HCPs in Alberta, Canada, interviews were digitally recorded and analyzed thematically (phase I). Two independent reviewers used three assessment checklists to evaluate commonly-used TRs (phase II). HCPs provided feedback on our coding scheme and checklist data (phase III). Results Three themes described how HCPs (n = 19) used TRs: purpose of use (e.g., clinical support), logistical factors (e.g., accessibility), and decision to use (e.g., suitability). The latter theme overlapped with constructs of suitability on the checklists. Overall, participants used 15 TRs, most of which scored ‘average’ on the checklists. Conclusion Phases I and II provided unique insights on the evaluation of TRs used for preventing childhood obesity. Criteria on the checklists overlapped with HCPs’ perceptions of TR suitability, but did not reflect logistical factors that influenced their use of TRs. Practice implications Developers of TRs should collaborate with HCPs to ensure that subjective and objective criteria are used to optimize TR suitability in the primary care setting.