The answer to 'best time for stone walkway' is that the best time to install a stone walkway is during the spring or fall. These milder seasons allow the ground to be more easily excavated and provide ideal conditions for the concrete or mortar to properly cure. The cooler temperatures and lower humidity levels also make it easier to work with the stones without them cracking or chipping.
In the summer, the heat can cause the concrete or mortar to cure too quickly, leading to potential issues with the walkway's stability and longevity. During the winter, the frozen ground and potential for snow and ice can make the installation process much more challenging.