ABSTRACT Forest certification programs are voluntary initiatives emphasizing sustainable forestry and harvest practices. Compliance with certification standards is enforced through third-party audits. One requirement of most forest certification systems is the use of best management practices during harvesting activities. These practices are designed to mitigate potential negative outcomes of forest management and timber harvesting activities. Best management practice implementation has been found to have a variety of positive outcomes on water quality and other resources. However, information relating forest certification to implementation of best management practices and environmental outcomes on certified versus noncertified lands is scant. Here, we examine the role of third-party certification as it contributes to enhanced forest stewardship via implementation of voluntary best management practices. Our study adds to the limited body of research comparing sustainability practices and outcomes on certified vs. noncertified lands. In alignment with previous research on the topic, our study suggests that adherence to best management practices is better on certified versus noncertified forests. Our findings also suggest that for large public agency ownerships, organizationally driven factors beyond forest certification (e.g. institutional policy and trained staff) influence the use of best management practices during timber harvests.