Yes, setting your fence posts in concrete is highly recommended to ensure long-term stability and durability. Concrete serves as a sturdy base that holds the posts securely in the ground, preventing them from shifting due to soil movement, strong winds, or pressure from external forces, such as pets or even human activity. Without concrete, fence posts set in loose soil may tilt or collapse over time, especially in areas prone to extreme weather conditions like heavy rain, high winds, or frost heaving.

Why Choose Concrete?

Concrete offers the most solid and long-lasting foundation for fence posts. It provides the stability needed to withstand soil erosion and weather fluctuations. While alternative methods—such as setting posts in gravel or using soil backfill—can be used, they don't offer the same level of strength and support as concrete does. This is particularly important for taller fences that require extra stability.

Drainage and Rot Prevention

For wooden posts, there is a concern that concrete may trap moisture, causing the wood to rot over time. To avoid this, place gravel at the bottom of the post hole before adding the concrete. The gravel layer promotes water drainage, preventing water from pooling around the base of the wooden post. Applying a wood preservative to the part of the post that will be underground can also help protect against moisture damage.

Alternatives to Concrete

Although concrete is the most secure option, some homeowners opt for alternatives like gravel or compacted soil, particularly for smaller or temporary fencing. Gravel allows for better drainage than concrete, which can be beneficial in areas with frequent rainfall. However, for maximum longevity and resistance to weather, concrete remains the preferred choice, especially for fences built on uneven or soft ground.

Advantages of Setting Posts in Concrete:

1. Durability: Concrete provides long-lasting support, ensuring your fence remains upright and sturdy for many years.
2. Stability: It prevents movement caused by soil shifts, heavy wind, or erosion.
3. Easy to Level: Freshly poured concrete allows you to adjust and level your posts before it sets, making the installation process straightforward.

Disadvantages of Setting Posts in Concrete:

1. Permanence: Once set in concrete, removing or replacing a fence post can be challenging and labor-intensive.
2. Rot Risk for Wooden Posts: Without proper drainage, wooden posts set in concrete may rot due to trapped moisture.

For a stronger installation, concrete is the best choice, but always ensure proper drainage to avoid moisture damage to wooden posts. In some cases, using metal posts or vinyl posts, which don't rot, can further increase the longevity of your fence while still benefiting from the strength of a concrete foundation.

Sources:

1. Handyman's World
2. Bob Vila
3. Hercules Fence
4. Yard Blogger