Farmers’ agricultural practices in Vietnam are highly sensitive to weather, climate variability and climate change. The lack of timely and actionable climate-informed agricultural advice leads to significant input and yield losses, which can render investments in farming unprofitable. Development organizations in Vietnam have provided agro-climate services (ACS) to smallholder farmers on a limited scale. They advocate for the govern ment to consider upscaling the provision of ACS, but a large-scale roll-out could strain the government’s financial and human resources. Evaluating the merits of climate services is challenging, because weather and climate risks, as well as the benefits that information services may provide, cannot be derived from robust existing datasets or predicted with certainty.