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Ice Thickness Safety Chart: How Thick Should Ice Be for Walking, Skating, Fishing & Driving?

Ice Thickness Safety Chart showing safe ice thickness for people walking, cars, and trucks
Written By: Catherine Boeckmann Executive Digital Editor and Master Gardener

How thick does ice have to be to drive a truck on it? To skate on? To go ice fishing? Before you go out in the cold weather, check our ice thickness chart to determine if it’s safe!

Use common sense on the ice. If you’re going skating or ice fishing with a group, stay off ice less than 4 inches thick. 

Generally, avoid ice with cracks or ice near inlets or moving water. If you’re unfamiliar with an area, talk to the locals because ice is rarely the same thickness across a body of water and can change. 

If you’re going ice fishing, it may also be a good idea to check with a local expert about ice safety. Bait shops or lakeside businesses may know about the ice conditions. Always be safe, and don’t put yourself or others at risk.

Ice Thickness Safety Chart

Safe Ice Thickness Chart
Ice Thickness*Permissible Load
3 inchesA single person on foot
4 inchesGroup in a single file line
7 1/2 inchesPassenger Car (2-ton gross)
8 inchesLight truck (2 1/2-ton gross)
10 inchesMedium truck (3 1/2-ton gross)
12 inchesHeavy truck (8-ton gross)
15 inches10 Tons
20 inches25 Tons
30 inches70 Tons
36 inches110 tons

* Solid, clear, blue/black pond and lake ice.

Slush ice has only half the strength of blue ice; the strength value of river ice is 15 percent less.

WARNING: Always be cautious. If you are unsure if the ice is safe, don’t take your chances!

Download a printable copy of our Ice Thickness Safety Chart.

Exercise extreme caution when using vehicles on ice and go with someone familiar with the area. The chart above shows that ice must be at least 8 inches thick to hold a small pickup truck.

Also, don’t drive in a group. Park cars at least 50 feet apart or more and move every few hours. Drive at a very slow speed with seatbelt off and door unlocked. 

Always bring safety gear: A life jacket, ice pick, cell phone, length of rope, and ice auger. Check out what to pack in your emergency survival kit.

Testing the Ice Thickness

How do you check the ice? Experts compare it to checking the oil in your car. 

With a drill, make a hole. Hook the end of a tape measure on the edge and take the measurement. It’s worth bringing an ice auger to test the ice as you walk and move.

How to Stay Safe on the Ice

Frozen surfaces can be captivating but pose risks to those who venture onto them. Here are some essential tips to ensure a winter wonderland experience that’s both enjoyable and secure.

  • Check Ice Thickness: Before stepping onto any frozen body of water, it’s crucial to determine if the ice is thick enough to support your weight. Always consult local authorities or experienced ice enthusiasts for ice thickness guidelines specific to your area.
  • Stay Informed: Keep yourself updated with weather conditions and ice conditions. Sudden temperature changes can weaken ice, and recent snowfall can obscure potential hazards.
  • Wear the Right Gear: Dress warmly in layers and ensure you have appropriate winter clothing. Additionally, wear ice cleats or crampons on your boots to improve traction.
  • Bring Safety Equipment: Carry safety essentials like a life jacket, a throw rope, and a whistle. Carrying ice picks or ice claws is also a good idea; they can help you pull yourself out of the water if you fall through.
  • Stay in Designated Areas: Whenever possible, stick to established ice-skating rinks or areas designated for winter activities. These locations are typically monitored for ice safety and maintained regularly.
  • Avoid Alcohol: Consuming alcohol on the ice can impair judgment and reaction time, increasing the risk of accidents. Save the celebratory drinks for after you’ve safely returned to solid ground.
  • Buddy System: It’s always safer to venture onto the ice with a friend or in a group. If someone falls through the ice, having others nearby can make all the difference in rescue efforts.
  • Know What to Do if You Fall In: If you find yourself in a situation where the ice breaks and you fall in, remain calm. Keep your head above water, turn toward the direction you came from, and use your ice picks or claws to grip the ice’s edge. Kick your legs to propel yourself up and out of the water, rolling away from the hole.
  • Respect the Signs: Pay attention to warning signs posted near bodies of water. These signs are there to keep you safe and should never be ignored.

Understanding ice conditions, wearing appropriate gear, and following these safety guidelines can help ensure that your winter wonderland adventure remains a cherished memory rather than a dangerous ordeal. See our Windchill Chart for more important outdoor winter safety information!

Weather References

About The Author

Catherine Boeckmann

Catherine Boeckmann

Executive Digital Editor and Master Gardener

Catherine Boeckmann is the Executive Digital Editor of Almanac.com, the digital home of The Old Farmer’s Almanac. She leads digital editorial strategy and publishing across a wide range of Almanac sub...

Read more from Catherine Boeckmann

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Comments

<span>Sandra Bender</span> Thu, 02/18/2021 - 12:02
I realize that my fears are probably completely ridiculous, but I live right on the banks of a river and my city curates walking, skating, and cross-country ski trails on it. I assume that they're measuring, and I frequently see lightweight vehicles driving down the skating trail (which is in the center and almost certainly where the ice would be thinnest) to clear off the snow, so I know that the ice is thick enough to support the weight of that vehicle. Even so, sometimes when I'm walking or skating, the ice will make cracking sounds that I find extremely alarming. It's been VERY cold here lately (like, -30 Celsius and lower), so I also know intellectually that it's almost certainly too cold for the ice to be in any danger of melting, yet the cracking sounds scare me. Is there anything you could tell me to reassure me that this is normal or something? The river itself is shallow, especially in winter (maybe 20' at the deepest, more like 8' at the shallowest), and there are places where you can see that the ice is at least a foot thick. All the same, I nearly have a heart attack every time I walk over a spot and it starts making those cracking sounds. Reassure me??
<span>Brian</span> Sat, 01/08/2022 - 07:00
At those Temps for a couple weeks you are as safe as ice gets the cracking sounds are likely the pressure of new ice forming or barely shifting from you walking on. Often sound like an electrical type sound of dune dune dune. Happens all the time when I am fishing on ice. But still is spooky no matter how many times I hear it.
<span>Bryan M Hannes</span> Wed, 01/05/2022 - 18:27
Those are just pressure cracks that you hear basically it is making the ice stronger. You are sick but be very careful with ice on a river, as there is always moving water underneath and may not always need to see this even with extreme cold temperatures.
<span>Marti Nelso</span> Mon, 01/03/2022 - 17:38
River ice is more dangerous than flat water ice. In addition to the risks mentioned in other replies (especially flow), river water can and commonly does change levels after freezing. When cold weather continues for a long time, streamflow diminishes, the water level falls, and a shelf of ice can be left hanging in mid-air. Water level in a river may also be controlled by upstream or downstream dam effects that you are probably not be aware of. When I read about people falling through ice, it is usually on a river. I have fallen through ice once, while snowshoeing over a flowage in a marsh. It was only waist deep, but the bottom was very slippery, and the current threatened to pull me under the ice. Also, my snowshoes got entangled in vegetation. Personally, I only go on river ice if I can walk along recent tire tracks! BTW, if you ever do hear lots of cracking as you step forward and feel it give, immediately lay down flat on the ice and creep back in the direction you came from!
<span>William Scott</span> Fri, 12/17/2021 - 12:29
If you see plow trucks on it clearing the ice then absolutely nothing to worry about Ive been through ice twice there will not be a third time. I basically do not go on it. Ive been on ice once in last 50 years there was a helicopter landing on it and other people on it. I did mot venture too far. If it makes you nervous that bad, best to just stay off
<span>Dj</span> Fri, 11/19/2021 - 15:06
You can walk and even fish on 2" of ice. Ice fishermen will even carry long iron bars to test ice thickness early in the winter. 8 or 10 or 12" of ice is not just going to 'crack open'. Yes the sounds are scary. But - the riskiest times are early ice, late ice, ice near moving water/current, and bad condition ice. Think of an ice cube - that type of ice is called blue ice and is very very strong. You will not fall through 2 inches of blue ice. But there is also white/crumbly ice...crusty ice...this isn't very strong stuff at all. When in doubt take an ice chisel/spud bar out to check the ice in front of you!!
<a title="View user profile." href="/author/editors">The Editors</a> Thu, 02/18/2021 - 15:42

Ice cracks when it expands or when it contracts. As long as the ice your on is thick enough near shore, you should be fine. But follow your instincts! Nothing is worth falling through the ice. 

 <span>Beltran</span> Wed, 12/12/2018 - 20:47
I plan on ice skating on a derby lake, lake Cornelia in Iowa, this winter. I'm worried about ice thickness. how can I tell if ice is at least 4 inches?
<a title="View user profile." href="/author/editors">The Editors</a> Thu, 12/20/2018 - 09:22

Hi, Beltran: The best thing to do would be to chip away or drill a test hole in a shallow place near the shore, bearing in mind that ice can still be thinner farther out, where there might be springs, currents, or pressure cracks. Have fun and thanks for asking! And be safe out there!

 <span>Beltran</span> Wed, 12/12/2018 - 20:48
nearby, not derby lol