A wave of arctic cold has settled over Iowa, and it’s quickly thickening the ice on lakes and ponds across the northern two-thirds of the state. With winter setting in, many people are gearing up for ice fishing, snowmobiling, skating, and other cold-weather activities.
Before heading out, the DNR urges everyone to pay close attention to ice thickness. You’ll want at least four inches of solid, clear ice before fishing, and five to seven inches if you plan to take out a snowmobile or ATV. Bigger utility vehicles should wait for seven inches or more.
Ice doesn’t freeze evenly. Depth, size, and weather all affect how quickly a lake locks up, and even once it’s frozen, conditions can change fast. One part of a lake might have strong ice while another spot just a few steps away is thin. Anything sticking up through the surface—like rocks, branches, or dock posts—can weaken the ice around it. If anything feels off or looks unsafe, don’t risk it.
Snow-covered ice can also be tricky. Snow acts like insulation, slowing down ice growth and hiding cracks or weak areas. River ice is also naturally weaker than lake ice—about 15% less stable. Safer ice usually has a bluish tint, while slushy, dark, or honeycombed areas should be avoided.
Staying Safe on the Ice
- Remember: no ice is guaranteed safe.
- Fresh, new ice is usually stronger than old ice.
- Never head out alone.
- Tell someone where you’re going and when you expect to return.
- Check the thickness as you travel.
- Steer clear of discolored snow or ice.
- Snow buildup slows freezing.
- Pack safety essentials: ice cleats, hand warmers, a spud bar, ice picks worn around your neck, a rope, life jacket, whistle, first aid kit, and dry clothing.
Snowmobilers should be especially cautious. Machines don’t steer well on slick ice, and stopping distances are longer. Keep your speed down and avoid hard braking.
