||National parks are important tourist destinations because of their high bio- and geodiversity values that enable outdoor activities and leisure in natural environment. This is vibrant issues because the COVID-19 pandemic restrictions have limited leisure in natural environment. This presentation highlights the outcomes of the survey conducted on visitors behaviour and motivations during national park visits at the time of the COVID-19 pandemic in 2020. The research was conducted in two mountain national parks located in south-western Poland, i.e., Stolowe Mts. National Park (SMNP) and Karkonosze National Park (KNP), both located in the Sudety Mountains along the Polish-Czech national border. The study identifies intentions of visitors behaviour change in comparison with the pre-COVID-19 period, i.e., 2017-2019. The study aimed to determine the factors that influence the mountain national park visits. Specifically, the surveys were used i) to assess spatiotemporal changes of visitors, distribution in two national parks, including changes in seasonality of tourism and frequencies of main tourism attractions sight-seeings; i) to characterized changes in motivations and behaviours of park visitors during the pandemic period in comparison to the pre-COVID-19 period.