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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.

A horizontal fence is typically more expensive to build than a vertical fence, often costing between 10% and 20% more. The higher cost is due to the need for a higher grade of lumber and more posts to prevent the boards from sagging, which increases both material and labor expenses. Despite the higher price, horizontal fences tend to be more durable and offer a more distinct, modern look compared to the more common vertical picket style. However, they may not be the best option for privacy, as there can be slight gaps between the horizontal rails.

You can use pressure-treated wood for a horizontal fence, but you’ll need to purchase a thicker and higher-quality variety to ensure it doesn’t sag or warp after you install it. Use #2 pine grade lumber and boards and thicker dimensional lumber, such as a two-by-six. You’ll also need to use stainless steel or hot-dipped galvanized fasteners, as the chemicals in the treated lumber will cause regular galvanized fasteners to rust. 

Moisture and rot are the largest threat to wooden fences. Stain can help your wood fence last 15 to 20 years, but only if you choose a stain with waterproofing qualities or add a sealant. Oil-based stains create a thicker moisture barrier than water-based stains, though both are mold and mildew resistant. You’ll generally need to re-stain your fence every one to eight years to get full protection.