Eastside Fence

Michigan's frost line sits at 42 inches. That's the depth the ground reliably freezes to in a bad winter in Metro Detroit. When water in the soil freezes, it expands. That expansion pushes upward — it's called frost heave, and it doesn't care what's in its way.

A post set at 24 or 30 inches sits right in the middle of that freeze zone. First winter, maybe nothing obvious. Second winter, the post has moved a quarter inch. Third winter, you're starting to notice the fence isn't quite plumb anymore. By year five, the post is visibly leaning and the panels are starting to rack.
The fence didn't fail. The installation failed. Two different things, and only one of them shows up in the warranty conversation.

What makes it worse in this area specifically is the soil. Metro Detroit sits on mostly heavy clay with few exceptions. Clay holds moisture better than sandy soil, which means it has more water available to freeze, which means the heave forces are higher than they'd be in a drier region. 42 inches here isn't conservative — it's the floor.

The other thing worth knowing: a post that's heaved once is easier to heave again. The freeze cycle loosens the soil around the post. Each cycle after that takes less force. So the fence that looked fine for three years can go from "slightly off" to "noticeably leaning" in a single bad winter.

Post depth isn't a line item you negotiate. It's the part of the job that determines whether everything else holds.

A question that decides more about your fence than most people realize: how deep are the posts set?

In Metro Detroit, the frost line sits around 42 inches. That's how far down the ground freezes in a hard winter. A post set above that line is a post the freeze-thaw cycle can push out of the ground, season after season, until it heaves or leans.

Post depth isn't where contractors cut corners because they're lazy. It's where they cut corners because homeowners can't see it once the concrete is in. The fence looks fine on install day either way. The difference shows up in year three.

If you're getting fence quotes right now, it's worth asking one question: how deep do you set your posts?

The answer tells you more about what the fence will look like in five years than any photo on a website.

Proudly serving Oakland, Macomb & Wayne Counties.

A wood fence doesn’t have to rely on wood posts to look great.

One option more homeowners are starting to appreciate is building a wood fence with PostMaster steel posts hidden behind the fence line.

That means you still get the classic look of wood, but with a stronger structural support system underneath.
For the right project, it can be a smart way to keep the appearance people want while improving the long-term backbone of the fence itself.

At Eastside Fence, we believe good fencing decisions come from understanding the materials behind the finished look — not just the look itself.

Proudly serving Oakland, Macomb & Wayne Counties.