The answer to 'when to retaining wall' is that the best time to build a retaining wall is when you need to address a sloping or uneven landscape on your property. Retaining walls are used to hold back soil and prevent erosion, and they can be an effective solution for creating usable, level outdoor spaces. The ideal time to construct a retaining wall is when you're planning a new landscaping project or renovating an existing outdoor area.
Retaining walls can be built at any time of year, but the most favorable conditions are typically in the spring or fall when temperatures are mild and the ground is not frozen. This allows for optimal soil conditions and ease of construction. It's important to carefully plan and design the retaining wall to ensure it's structurally sound and fits the specific needs of your landscape.