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Yes, fence posts need to be installed below the frost line to ensure stability and prevent heaving caused by freezing and thawing cycles. The frost line is the depth at which soil freezes during winter. By placing posts below this line, often around 3 to 4 feet deep or as recommended for your specific region, you reduce the risk of the ground shifting, which can lead to leaning or unstable fences. Adequate depth provides better anchoring and helps maintain the fence's integrity, ensuring it remains secure and upright throughout changing seasons.

How much does a privacy fence cost? Stockade fences cost $12 to $13 per linear foot for materials. You may find fencing that costs less, but it’s likely wholesale wood manufactured using young trees. Fencing materials made with young trees are less durable than those made with mature trees.

For installation, expect to pay $30 to $80 per hour. Installing a 150- to 200-linear-foot fence takes 20 to 35 hours, which comes to about $600 to $2,800 for labor.

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.

Determining the best type of fence to contain your pet can be tricky. Consult a pet fence installer and consider the following questions:

• What size pet do you have? Some fence types, like chain link, are too short to contain large dogs.

• Is digging an issue? Some fences, like brick or stone, help minimize digging at the fence line, where wood fences aren’t as adequate. 

• Do you need to block your pet’s view of the neighbor's yard? Some fences, like metal iron fencing and chain link, don’t offer an obstructed view.