Hello, and thank you for your inquiry. This pool is in the suburbs of Chicago, and we are certainly no stranger to snow or sub zero temps. Any hot tub can be utilized year-round, as long as provisions are made during construction to ensure freeze protection, pipe insulation, and proper structural techniques.

Thank you! I love the beauty of the hot tub water cascading over into the pool but just wondered how the waterfall feature could be turned off so hot tub could be enjoyed. Yes, you are no stranger to snow in Chicago and that's why I asked! A beautiful design! We will make sure about those winter weather protections and precautions when we design and build in 2 years! Thanks again!

The hot tub spillover is actually a dedicated manifold that can be turned off without affecting the spa. It is known as a sheer descent, but it is offered by several manufacturers and is made in a variety of materials. Here is one manufacturer of the product: http://www.jandy.com/en/products/water-features