Des Moines, Iowa – Iowans may hear sudden loud cracks or booming noises early Friday as persistent Arctic cold renews the risk of the “exploding tree” phenomenon across much of the state.
According to the National Weather Service, subzero temperatures combined with lingering wind chills Friday morning are creating favorable conditions for frost cracking, also known as cryoseismic booming. This occurs when sap inside trees freezes rapidly and expands while the outer wood contracts, building pressure that can cause trunks to split suddenly with a sharp, explosive sound.
The highest risk Friday is focused across northern and central Iowa, including Mason City, Algona, Fort Dodge, Spencer, and along the Highway 20 corridor. However, parts of central and southern Iowa, including the Des Moines metro, could also experience isolated cracking during the coldest pre-dawn hours, especially in older neighborhoods with mature hardwood trees.
While exploding trees are uncommon, splitting trunks and falling limbs can damage vehicles, sidewalks, roofs, and power lines. Residents are advised to avoid standing beneath large trees during extreme cold and to park vehicles away from tree-lined streets when possible.
The same cold driving tree stress also increases the risk of frostbite on exposed skin within minutes, frozen pipes, and vehicle issues. Officials urge limiting outdoor exposure Friday, dressing in insulated layers, covering all exposed skin, and keeping pets indoors. Cold-related warnings and advisories remain in effect, with additional updates possible as conditions evolve.
