07/03/2026
When Trees "Explode"
If you followed the adventures of British YouTubers Josh and Jase while they were here visiting Michigan, you may remember them joking about trees "exploding" during the cold snap.
As strange as it sounds, there is actually some truth behind those stories.
During periods of extreme cold, especially when temperatures fluctuate rapidly, the outer layers of a tree can expand and contract at different rates than the wood beneath them. The resulting stress can cause frost cracks, bark splitting, branch tip dieback, and other forms of winter injury.
Some trees are more susceptible than others, particularly younger trees, thin-barked species, and trees exposed to direct winter sunlight. Frost cracks are often found on the south or southwest side of the trunk, where daytime warming is followed by rapid cooling after sunset.
Historically, foresters often referred to frost cracks as "frost seams." If you picked up an old forestry report from the early 1900s, you might find references to a tree "showing an old frost seam" rather than a frost crack. The term has largely disappeared from everyday use but was once common among foresters and timber cruisers.
Historically, orchardists also painted tree trunks with a diluted white latex paint mixture to reflect sunlight and reduce temperature fluctuations during winter. The practice is still used today on some young orchard trees.
A few of our older chestnut trees showed signs of winter injury this year, including branch tip dieback and frost seams on the trunk. While the damage looked concerning this spring, most of the affected trees appear to be recovering well with healthy foliage, strong growth, and new callus tissue forming around the damaged areas.
Have you ever seen frost cracks, frost seams, winter dieback, or bark splitting on trees where you live? Share a photo in the comments and let us know what species was affected. We'd love to see examples from other properties and compare notes from across Michigan and beyond.
WR Chestnuts
Heritage. Rooted. Timeless.