With the increasing energy production from biomass combustion, the interest in the reuse of its solid residue wood ash is also increasing. This master thesis focused on the leaching behavior of wood ash, in particular regarding metals and metalloids, in the context of the reuse of wood ash in forestry road construction. First, a leaching experiment with pure wood ash was performed; in a second experiment, this wood ash leachate was applied to soil columns to see how the leachate concentrations were affected by filtering through soil. The first experiment showed that the leaching potential of wood ash in general decreases over time, though for some elements total leachate concentrations or even qualitative leaching trends differed between the experimental ashes. The most critical parameters concerning the compliance with legal thresholds were pH, electrical conductivity, B, Al, Cr, Fe, Ba, Pb and NO2. The soil columns in the second experiment had a strong buffering effect on the wood ash leachate that was applied; most parameters complied with the drinking water thresholds after filtering through the soil columns. Overall, from the ecological point of view, wood ash seems to be suitable for utilization in forestry road construction. As the composition of ashes can differ strongly in its element concentrations and speciation, it might be necessary to assess each particular ash before its application to forestry road.