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The possibility of even timber flows and fulfillment of the industry's timber needs strongly depends on roads' accessibility at the planned delivery time. The main reason why forest sites cannot be reached is the deterioration of road accessibility due to changing weather conditions. Depending on the weather, the expected road accessibility can suddenly change, overturning the conditions for laid production and transport planning. Despite solid planning of harvest and transport, which is done today with advanced decision support, the availability of timber cannot always be ensured. Tools are missing to take into account unexpected - but also expected - changes in road accessibility. At the same time, more knowledge is needed about when the wood by the road is expected to be available for truck transport and how this information can be used when planning harvest and transport occasions. The goal of this project is to develop the foundations for decision support where the uncertain availability of roads is taken into account already in the harvest planning and thus to develop a method that makes it easier for logistics planners to develop schedules for harvesting and transport that match both the demand and the road accessibility. In the long run, this is expected to enable forestry to create robust harvesting plans with greater accuracy and less risk of replanning than today, thus leading to better utilization of timber as well as planning, harvesting, and transport resources.