Deep Freeze 2026: Exploding Trees Myth vs Frost Cracks

In late January 2026, a deep freeze hit Canada and the U.S. Temperatures dropped below –20 °C, with wind chills under –40 °C, sparking a viral claim that trees could explode. A social‑media post warned that seven northern states, from North Dakota to Michigan, might see a risk. Scientists say the phenomenon is “frost cracks” – vertical splits from rapid freezing of sap that expands and can sound like a bang. Arborists Simon Peacock and Bill McNee explain that the cracks heal in summer but can leave a lasting “frost rib.” The Minnesota DNR says there’s no need to avoid woods. The cold could also trigger frost quakes and thundersnow. The piece was written by CBC’s senior writer Nick Logan and published on Jan 23 2026.