Recent research has shown that new particle formation (NPF) is an important source of ultrafine particles in the atmosphere which influence cloud formation and atmo- spheric radiative transfer. In the last decades multiple researches in many different regions analyzed the gas-to-particle conversion and the growth of new formed par- ticles in the atmosphere. Only a few field campaigns focused on NPF above the boundary layer. The following study investigates NPF on two alpine mountain sum- mits. The data were recorded at the Environmental Research Station Schneeferner- haus at Zugspitze (2650 m AGL) and at Sonnblick Observatorium (3106 m AGL) between 1st of March to 31st of July 2013. Both stations can be characterized with comparable environmental circumstances regarding large scale weather patterns and topography. The collected database is a combination of scanning mobility particle sizer and meteorological weather data in relation to model data. After classifying the particle size distribution into three classes according to Dal Maso et al. (2005) 21 event days at Zugspitze and 14 event days at Sonnblick were detected. The com- parison of both research stations showed that the two stations had 13 event days in common. The investigated areas are less than 150 km linear distance apart and are influenced by the same large scale weather patterns which cause similar local weather phenomena due to comparable landscape and topography. With assistance of webcam pictures combined with the available data on both summits specified weather conditions could be detected which influence NPF in the area. The perfect conditions for NPF turned out to be a certain amount of radiation in combination with vertical exchange through thermally induced plain to mountain winds. To fully understand the NPF a more detailed research database needs to be developed which detects particles smaller than 10 nm diameter which was not possible with the used scanning mobility particle sizer.