Forest fuel ignition is the most important stage of any forest fire. Ignition sources can be of different nature [1]. This article deals with the fire hazard investigation of different forest fuels exposed to the high temperatures of sufficiently small size carbon particles (a cylinder with 13-17 mm. height and 6-8 mm. diameter). Forest fuel specimen collection was held in Tomsk region Timiryazevskiy forestry. Timiryazevskiy forestry is a typical area for the Western Siberia region [2]. The experiments were performed on a unique physical modeling installation on the forest fuel ignition materials exposed to the high temperature particles. In the results of the experiments there were studied forest fuel ignition regularities of the heated via high temperature carbon particles. It was found out that there are two possible scenarios for the ignition process: a) the first is accompanied by carbon particles fall and its combustion, which clearly leads to the fire emergence; b) heated particles falling out is unaccompanied with the volatile compounds combustion. There was experimentally determined the lower limit ignition temperature and ignition delay time for the different initial temperatures of the carbon particles. The study identified the mechanism and conditions for the fallen leaves and needles fall ignition as a typical representative of hardwood (birch) and softwood (pine) trees of a single high temperature heated carbon particle. Also, experiments were conducted with dead grass. The obtained results are the objective prerequisites for the combustible forest fuel ignition generalized mathematical model development based on the established physical mechanisms of the investigated processes. There was shown a high dry leaves fall fire danger of deciduous trees (the lower limit of ignition is 1013 K). This fact allows us to conclude the need for further preventive measures application in mixed forests (especially with the soft wood predominance). It’s a known fact that leaves can be the fires initiators in fuel bed at a lower temperature of the heated particles which fall on the forest fuel layer.