The average lifespan of a wood fence is 15 to 20 years, but some can last for 40 years or more depending on several factors. The type of wood is crucial; for example, untreated pine may only last 5 to 10 years, while pressure-treated pine can last up to 20 years, and cedar's natural resistance can extend its life to 40 years. Other factors include local weather conditions, with wet and windy climates causing faster deterioration, and the quality of maintenance. Higher-end wood, metal posts, and privacy fence styles also tend to last longer.

The recommended height for a garden fence depends on its primary purpose. For pest control, the necessary height varies by animal. To keep out small pests like rabbits, a fence should be at least two to three feet tall. If you live in an area with deer, you will need a much taller fence, at least five feet high, to prevent them from jumping over. If the main goal is privacy, the fence should be at least seven feet tall. For purely decorative fences, the height is a matter of personal preference.

Galvanized metal, vinyl, and composite fences are known to be the longest-lasting options, often surviving for over 30 years with proper care. Metal fences, including galvanized chain link and aluminum, can look great for decades because the galvanization process adds a protective coating that resists weather and pests. Similarly, vinyl and composite materials are resistant to pests and can withstand harsh weather for many years. In comparison, a typical wood fence lasts about 15 years, and a standard vinyl fence has a lifespan of 20 to 30 years.

Pickets should sit at least 2 inches off the ground to encourage groundwater to flow underneath. Pickets can sit as much as 6 inches off the ground, but setting it any higher could let pets in or out of your yard unintentionally. These are not to be confused with the fence posts anchored underground with soil or concrete footing.