As you can imagine, how long stackable patio chairs last depends on both the materials and how heavily they are used. Weather-resistant patio chairs last longer, and covering patio chairs (or storing them inside) extends their life. The very best patio chairs last 15 years or even longer. The best Polywood patio chairs, for instance, sometimes come with warranties of 20 years. But cheaper plastic chairs may just last a few years. That’s all-important to consider when factoring in cost. Even if the initial sticker price is much lower than another chair, you may end up paying more in the long run.