Reports of “exploding trees” tend to surface during extreme winter cold, often paired with accounts of loud booms echoing through forests at night. While the phrase sounds exaggerated, the phenomenon behind it is real and well documented. It is not an explosion in the traditional sense, but a cold-weather process known as frost cracking, sometimes referred to as a frost burst.
Understanding what causes it, where it occurs, and whether it poses a real risk in New Jersey helps separate fact from viral exaggeration.
What Are “Exploding Trees,” Really?
So-called exploding trees are the result of frost cracks, long vertical splits that form in tree trunks during periods of intense cold.
The process works like this:
- Trees contain moisture and sap within their internal tissues
- When temperatures drop rapidly, that moisture freezes
- As water freezes, it expands, creating internal pressure
- The outer bark cools and contracts faster than the inner wood
When the stress becomes too great, the trunk splits suddenly. The release of pressure can produce a sharp cracking or popping sound, often compared to a gunshot or rifle crack. This is why reports frequently come from nighttime hours during deep freezes, when temperature drops are fastest and background noise is minimal.
Frost cracking most commonly affects trees with thinner bark, including:
- Maple
- Oak
- Birch
- Sycamore
- Fruit trees
The cracks can stretch several feet vertically and, in some cases, be wide enough to expose inner wood.
Can This Happen in New Jersey?
Yes. Frost cracking can occur in New Jersey, though it is far less common than in regions where sub-zero temperatures are routine.
Current weather context:
As of late January 2026, New Jersey is bracing for a sharp cold snap this weekend (January 24–26), with daytime highs in the teens to low 20s and overnight lows in the single digits to around 10°F. Some inland and northern areas could briefly dip near 0°F, with wind chills falling below zero. This is dangerously cold for people, pets, and pipes, but still below the threshold typically associated with widespread frost cracking, which usually requires sustained air temperatures in the –10°F to –20°F range.
That said, isolated frost cracks are still possible under the right conditions.
Risk factors in New Jersey include:
- Polar vortex events or Arctic outbreaks
- Rapid temperature drops following sunny winter days
- South- or southwest-facing tree trunks, which absorb more sunlight during the day and cool rapidly at night
Northern and inland areas such as Sussex and Warren counties are more susceptible than coastal regions, where ocean moderation limits extreme lows. While widespread “exploding tree” events are unlikely here, individual cases can occur during sharp cold snaps.
What Kind of Damage Can Frost Cracks Cause?
A frost crack is not automatically fatal to a tree, especially if it is otherwise healthy. However, it does create a structural and biological vulnerability.
Potential consequences include:
- Open wounds that allow insects, fungi, and bacteria to enter
- Internal decay, which weakens the tree over time
- Higher risk of limb or trunk failure during snow, ice, or wind storms
- Recurring splits, as old cracks often reopen during future cold events
Young trees and stressed trees are most at risk. In severe cases, frost cracks can lead to cankers, fungal infections that interfere with nutrient flow and may eventually kill the tree.
Many trees partially heal during warmer months by forming new bark tissue, but scars typically remain and can reopen in later winters.
Can Frost Cracks Be Prevented?
Frost cracking cannot be completely prevented, but the risk can be reduced, especially for young or ornamental trees.
Common protective steps include:
- Wrapping trunks with burlap or tree wrap in winter
- Using reflective guards to reduce daytime sun heating
- Avoiding late-season pruning that stresses trees before cold weather
If a fresh crack appears, arborists generally recommend monitoring rather than sealing, as improper sealing can trap moisture and worsen decay. Professional evaluation is advised if the tree is near homes, vehicles, or walkways.
The Bottom Line
Exploding trees are not a myth, but they are also not a common hazard in New Jersey. The loud cracking sounds reported during extreme cold are the result of wood splitting under thermal stress, not combustion or collapse.
While this weekend’s deep freeze is serious and potentially dangerous, it is unlikely to trigger widespread frost cracking unless temperatures plunge significantly lower or remain sub-zero for extended periods. Still, isolated cases are possible, especially in exposed or inland areas.
If a sharp crack echoes through the woods on a bitter night, it may not be fireworks. It may just be winter doing what winter does.
