This thesis investigated the development of state mindfulness and nature connectedness across three different interventions: conventional mindfulness training (CMT), a nature-based program without mindfulness (HMOU), and Restoration Skills Training (ReST), a mindfulness-based approach conducted in natural environments. Participants (N = 57) completed weekly assessments of state mindfulness and nature connectedness across five sessions. Results from mixed-design ANOVAs revealed overall increases in nature connectedness over time but no significant differences in change trajectories between intervention groups. For state mindfulness, participants in the mindfulness-based conditions generally reported higher ratings than those in the non-mindfulness group, though no statistically significant time × condition interaction was found. Correlation analyses showed weak but recurring associations between momentary mindfulness and nature connectedness, though no consistent predictive relationships emerged. The findings suggest that both environmental context and mindfulness practice may contribute to psychological processes of restoration and connection, but their interaction appears to be complex and dynamic. Future research is needed to further clarify the mechanisms linking mindfulness and nature connectedness across different settings and populations.