The answer to 'best time for retaining wall installation' is that the ideal time is typically in the spring or fall. During these seasons, the weather is mild and the ground is not frozen, making it easier and more efficient to excavate, install the wall, and backfill. This ensures the best results and reduces the risk of issues like cracking or shifting over time.
In the spring, the ground has thawed and the weather is cool, which allows the concrete or other materials to cure properly. In the fall, the temperatures are moderate and the ground is still warm, which also facilitates a successful installation. Avoiding the hot, dry summer months or the cold, frozen winter conditions is recommended for the best outcome.