Frost Heave 101: Why Recycled Plastic Edging Outlasts Wood in Winter

When winter arrives, one of the common,and frustrating,landscape issues many homeowners and professionals face is frost heave: the phenomenon of soil and edging materials shifting, lifting or becoming misaligned due to freeze‑thaw cycles. Understanding frost heave is critical for choosing the right landscape edging products, and for specifiers and installers, selecting the right material can spell the difference between a stable, long‑lasting installation and repeated repairs.

In this article we’ll cover:

• What frost heave is and why it matters,
• How common edging materials like wood perform under freeze‑thaw conditions,
• Why recycled plastic edging from Epic Plastics outperforms wood (and many other materials) in winter environments,
• Tips for designing and installing edging in frost‑susceptible zones.

What is Frost Heave and Why Does It Matter?

Frost heave occurs when moisture in the soil beneath the surface freezes and expands, creating upward movement of soil layers and materials. According to the encyclopedic entry on Frost Heaving:

“Upwards swelling of soil during freezing conditions… the force … is sufficient to lift a layer of soil, as much as 1 ft or more.” Wikipedia

In landscaping, frost heave can:

• Lift edging and cause misalignment between lawn and planting bed,
• Create gaps permitting grass or mulch to spill over or under the border,
• Damage the appearance and performance of the edging over time.

A soil‑educator blog from the University of Illinois Extension explains that many edging failures in cold climates result from improper material choice and inadequate installation depth/support. Illinois Extension

Given its impact, frost‑heave resilience is a key performance metric when evaluating landscape edging products.

Why Wood Edging Struggles in Winter

Wood has been a popular choice for edging due to its natural appearance and affordability. But when winter comes:

• Wood borders in direct contact with soil and moisture are prone to rot, especially when moisture cycles between frozen and thawed states.
• As soil heaves, wood lacks the stiffness and anchoring needed to resist shifting, meaning borders can rise or warp over time.
• Maintenance becomes more frequent,and ultimately more costly,as a result of freeze‑thaw damage.

In a recent review of edging materials, wood was singled out as one of the options with the highest maintenance risk in climates with heavy frost cycles. Castle Custom Curbing+1

So if you’re specifying edging for a region where frost heave is a concern, relying on untreated wood or basic pressure‑treated timber may lead to performance issues down the line.

How Recycled Plastic Edging from Epic Plastics Overcomes Frost Heave

At Epic Plastics, our edging solutions,including signature offering Benda Board® Epic Edge and other recycled‑plastic profiles,are engineered to withstand the environmental demands of frost‑susceptible zones. Here’s how we deliver better performance:

1. Engineered for Strength and Stability (See our Material Testing Results here)

Recycled high‑density polyethylene (HDPE) used by Epic Plastics retains dimensional stability under freeze‑thaw cycles. It does not absorb moisture, expand when frozen, or rot like wood.

2. Proper Anchoring and Installation Depth

While material matters, correct installation matters too. For frost‑prone areas, our edging requires a stable trench, appropriate anchoring stakes, and finishing grade that helps minimize upward soil movement.

3. Long‑Term Reliability

By choosing recycled plastic landscape edging made from robust materials, you reduce the risk of shifting, lifting or warping,even after many winters. This reduces maintenance cost and effort over time.

Installing Plastic Edging With Frost Heave in Mind

To maximize performance of recycled plastic edging in cold climates, follow these best practices:

• Dig a sufficient trench: Typically 4 – 6″ deep helps anchor the board below potential frost‑impact zones.
• Use quality anchoring stakes designed for edging in freeze/thaw settings (18” stakes every 3 feet)
• Backfill and compact soil to reduce voids where water could accumulate and freeze.
• Ensure surface drainage: Excess surface water can saturate soil and increase freeze‑thaw pressure.
• Allow for thermal movement: Even plastics expand/contract slightly; leaving minimal gaps at ends helps. Consider Epic Edge HDPE/Wood Flour composite.
• Choose high‑performance profiles: Using products that specify frost‑resistance or high modulus is wise.

The University of Illinois blog points out that proper installation is one of the main ways to reduce frost‑heave risk in edging installations. Illinois Extension

Why This Matters to Professionals and Homeowners

When you select landscape edging, you’re making a long‑term decision. Frost‑heave resistance translates into real benefits:

• Lower lifetime costs: Fewer repairs and replacements compared to wood edging in cold climates.
• Cleaner aesthetics: Stable edging retains crisp lines and separation between turf and beds even after many winters.
• Better performance for synthetic turf, artificial grass perimeters or high‑traffic areas where shifting is immediate.

For complete product details or to explore frost‑heave‑resilient edging solutions, visit our products page at https://epicplastics.com/products/

Addressing Common Myths: Plastic Edging Inevitably Fails in Frost? Not True

You may have read content suggesting plastic edging lifts in freeze/thaw conditions. For example, one article notes:

“Plastic rises above ground during winter due to frost heave.” Backyard Boss

That statement generalizes all plastic edging as equal,but the difference is material composition and installation. Standard low‑grade plastics can fail, but premium recycled HDPE edging like Epic Plastics offers is designed and tested for durability in demanding climates.

In other words: It’s not simply about “plastic vs. wood” but which plastic, how it’s engineered, and how it’s installed. (See our Material Testing Results here)

Summary

When it comes to edging your landscape in a climate subject to freezing and thawing, it’s critical to choose a product that won’t become a seasonal headache. Frost heave is a real force, but with the right material and installation strategy you can avoid the common issues of lifting, warping and shifting.

Recycled plastic edging from Epic Plastics offers a superior option,combining performance, sustainability and long‑term stability. If you’re planning a winter‑ready project, let your edging solution be one that’s built to last.

Visit our extensive products at Epic Plastics to explore frost‑heave‑resistant edging solutions and find technical resources to support your next installation.