There's no hard and fast rule on how long outdoor signage will last. The lifespan will depend on the material used and exposure to weather conditions. The more durable the material—like metal—the longer the sign will last. So, it's worth considering the kind of material you'd like to use during the planning phase of your outdoor sign project. Aluminum-based signs can last 7-10 years. Plastic will hold up for 5-10 years, depending on the finishes used. Vinyl exterior signage typically has the shortest life of only 2-3 years. Lastly, wood can last 10 years or more, depending on the wood type and finish.