Climate change is having a significant impact on urban trees in the Northeast region of Algeria. As temperatures rise and precipitation patterns shift, trees are facing new challenges that require careful study and management. One key characteristic of urban trees in the face of climate change is their ability to adapt to changing conditions. Some tree species are more resilient to heat and drought, while others may struggle to survive in a changing climate. Understanding which species are best suited to the local environment is crucial for ensuring the long-term health and survival of urban trees. Another important characteristic is the role of urban trees in mitigating the effects of climate change. Our work aims to show whether the structure of trees is influenced by environmental factors, focusing on the main phenological phases of trees in urban areas. The methodology involves taking dendrometric measurements for different trees and shrubs in five locations where three plots are in urban state and two plots are in two different garden in the Mediterranean urban area, as well as monitoring the main phenological phases for certain species. Statistical analysis of the data showed a significant difference in dendrometric measurements, which varied from one location to another. The health status of the trees also varied from one location to another, illustrating the effect of local conditions on vegetation development. Climate change, particularly the increase in temperatures in January and February and snowfall in March, causes vegetation to behave differently than before.