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How long a fence lasts, including a split rail fence, will depend on the material from which it’s made. The average lifespan of a wood fence is about 15 to 20 years. However, split rail fences made out of premium materials, like composite, vinyl, steel, or aluminum, can last for 25 to 30 years or more, especially if you take good care of the material and carry out necessary maintenance.

No, fence posts aren’t always set in concrete. If you don’t want to use concrete footings for your posts, expanding foam is a popular alternative. Expanding foam and concrete each have certain pros and cons. For instance, foam is easier to install and more sustainable, but concrete is sturdier and less expensive.

The depth of your post hole depends on your post length. If you decide on a two-rail fence, the posts are likely 6 feet long. You want your hole to be at least 1/3 of the post length. In this case, your post hole should be two feet deep.

If you opt for a three-rail fence, the posts will typically be 7 feet long, meaning your post hole should be 28 inches deep.

The best wood for a farm fence is pressure-treated wood that will stand up to various weather conditions, animal contact, and moisture. Farm fences need to resist rot and damage, so choose a species such as cedar or redwood. The natural oils in these woods give them decay resistance, which also makes them ideal for other fence types, such as a wooden snow fence.