This study investigates factors influencing coordination of the California grape and wine supply chain. Results corroborate prior findings that quality considerations and needs to protect investments in specialized or durable assets significantly increase usage of more formal coordination mechanisms, such as formal contracts and vertical integration or ownership. Consistent with findings for other industries, such investments are associated with greater contract complexity and inclusion of enforcement provisions, while trade partners’ prior experience working together decreases contract complexity. Furthermore, our results suggest that quality considerations extend to greater use of formal contracts further downstream.