Urban freight by motorized transport poses a threat to the sustainable development of modern city centers through extensive emissions of greenhouse gasses, contributing to congestion, and increasing the risk of traffic accidents. In addition, further densification of European city centers demands an effective use of urban areas. As urban planners are shifting their focus from automobiles to cyclists and pedestrians, the cargo bike has been used as an alternative to motorized vehicles for urban freight in several European cities. Flexible use of cargo bikes permits efficient delivery of goods in congested urban areas, with zero emissions. Cargo bikes are also becoming a part of the city logistics in northern countries like Norway, where they are prone to adverse weather conditions, low temperatures and roads covered with snow and ice. The Armadillo, a four-wheeled cargo bike from the Swedish company Velove, was used in Norway for its first winter in 2018/19. Based on the lack of research on how cargo bikes operate in northern climates and a hypothesis that cargo bikes operate with less efficiency on winter roads than in summer conditions, the two following research questions were formulated: 1. What challenges and obstacles are cargo bikes facing on winter roads? 2. How can we facilitate and ensure efficient operation of cargo bikes in northern climates? To answer these questions, two methodological approaches were applied. First, observations and GPS-tracking of a working cargo cyclist were performed on winter roads in Trondheim, Norway. Second, seven qualitative interviews were conducted among experienced cargo cyclists in several Norwegian cities. Calculated velocities for the observed cargo cyclist showed that the average velocity in general was 27.6% lower for winter trips than spring trips. The observations and the interviews show that even though snow, ice, slush and low temperatures reduces the cargo bikes efficiency, using cargo bikes for urban delivery on winter roads is fully feasible. The design of the Armadillo, sufficient clothing and good planning solves many of the challenges faced by cargo bikes on winter roads. In addition, a cargo bike with more durable parts, larger wheels and better illumination, as well as an increase in the amount of bicycle lanes, would further facilitate the efficient operation of cargo bikes in northern climates. The biggest challenge concerning the use of cargo bikes for urban delivery in northern countries, seems to be urban consolidation centers or micro depots as an essential prerequisite for effective operation. Such centers would also provide the cargo cyclists a warm place to take breaks and to load, charge and maintain the cargo bikes. The findings in this study are supposed to provide further knowledge for urban planners, municipalities, road owners and logistic companies on how to ensure efficient operation of cargo bikes on winter roads.