Sleet vs Freezing Rain: What’s the Difference?

Sleet vs freezing rain comes down to one thing: when the ice forms. Sleet is rain that freezes into small ice pellets before it reaches the ground, so it bounces and piles up like grit. Freezing rain stays liquid all the way down and freezes the moment it touches a cold surface, wrapping roads, trees and power lines in a smooth glaze of ice.

That difference matters. Sleet makes roads slippery, while a long freezing rain event can become an ice storm that knocks out power for days. Here is how each forms, how to tell them apart and what the alerts mean, based on the National Weather Service and NOAA’s National Severe Storms Laboratory (NSSL).

Sleet vs freezing rain: the short answer

The NWS glossary defines sleet as pellets of ice made of frozen or mostly frozen raindrops, or refrozen, partially melted snowflakes. The pellets usually bounce when they hit the ground or other hard surfaces.

Freezing rain, in the same glossary, is rain that falls as a liquid but freezes into glaze on contact with the ground. Glaze is simply the ice formed when freezing precipitation coats the ground or exposed objects.

The quick test: if it is already frozen when it lands, it is sleet. If it lands as water and then turns to ice, it is freezing rain.

How winter precipitation forms: it starts as snow

According to NSSL, most precipitation that forms in wintertime clouds starts out as snow, because the top of the storm is usually cold enough to create snowflakes. What reaches you depends on the temperatures the flakes pass through on the way down.

The key is a layer of warmer air that sometimes sits above the cold air near the ground. The depth of that warm layer and of the freezing layer beneath it decides whether snow, sleet or freezing rain reaches the ground.

Snow

Snow reaches the ground when the temperature stays at or below 32°F (0°C) from the cloud base all the way to the surface. The flakes never melt, so they land as the ice crystals they formed as.

Sleet

Sleet forms when snowflakes fall through a shallow layer of warm air and only partially melt. The slushy drops then fall through a deep layer of freezing air above the surface and refreeze. They reach the ground as frozen raindrops that bounce on impact, NSSL explains.

Freezing rain

Freezing rain forms when snowflakes descend into a warmer layer and melt completely. The liquid drops then pass through only a thin layer of freezing air just above the surface, which is not enough time to refreeze. These drops are “supercooled,” meaning they are liquid below the normal freezing point, so they freeze instantly on contact with anything at or below 32°F. You can read NOAA’s full breakdown in its winter weather types guide.

Side-by-side comparison

How to tell them apart where you live

You can usually identify what is falling with your eyes and ears:

• Sleet arrives as small, hard ice pellets. They bounce when they hit pavement, windshields and car roofs, and you can often hear them tapping on windows.
• Freezing rain looks like ordinary rain while it falls. The giveaway is what it leaves behind: a clear, shiny coating on branches, railings, cars and wires that keeps getting thicker.
• Freezing drizzle is the lighter version. The NWS defines it as drizzle that falls as a liquid but freezes into glaze or rime on contact with cold ground or structures.

Sleet is also much denser than snow. NSSL notes that on average about 13 inches of snow equals 1 inch of rain in the United States, but that ratio can be as low as 2 inches for sleet and nearly 50 inches for very dry, powdery snow. That means a layer of sleet holds far more water than the same depth of fluffy snow.

Sleet is not hail or graupel

People often mix up sleet with other kinds of ice falling from the sky. The NWS draws clear lines between them:

• Hail is showery precipitation in the form of irregular pellets or balls of ice more than 5 millimeters across, falling from a cumulonimbus cloud. In other words, hail comes from thunderstorm clouds, while sleet comes from winter storms with a deep cold layer near the ground.
• Graupel is the NWS term for snow pellets, also called small hail. It is not the same as sleet, which is a frozen raindrop or a refrozen, partly melted snowflake.

When freezing rain becomes an ice storm

NSSL says a significant accumulation of freezing rain lasting several hours or more is called an ice storm, and it defines an ice storm as one that leaves at least 0.25 inch of ice on exposed surfaces. The NWS glossary agrees that significant ice accumulations are usually 1/4 inch or greater.

The weight of that ice is the problem. According to the NWS, heavy accumulations can bring down trees and topple utility poles and communication towers, disrupting power and communications for days while crews repair the damage.

Some regions see freezing rain more often than others. NSSL research found higher freezing rain susceptibility over New York and Pennsylvania, in the Pacific Northwest and in the lee of the Appalachian Mountains, where cold air gets trapped against the mountains while warmer, moist air rides over it.

What the NWS alerts mean

Local NWS offices issue winter alerts based on local criteria, so the amount of snow or ice that triggers a warning in the Northern Plains can be much higher than in the Southeast. In general:

• Ice Storm Warning: usually issued for ice accumulation of around 1/4 inch or more. The NWS says travel is strongly discouraged, and snapped power lines and falling branches are likely.
• Winter Storm Warning: issued for a significant winter weather event that can include snow, ice, sleet or blowing snow. The NWS glossary notes that a warning for heavy sleet, an accumulation of more than 1/2 inch, is usually issued as a Winter Storm Warning because that much sleet is relatively rare.
• Winter Storm Watch: conditions are favorable for a significant winter storm, including heavy sleet or an ice storm.
• Winter Weather Advisory: snow, blowing snow, ice, sleet or a mix is expected, but not severe enough to meet warning criteria. The NWS glossary also describes advisories for freezing rain or freezing drizzle when a significant accumulation is not expected, and stresses that even small amounts can cause significant travel problems.

If temperatures crash behind the ice, check our guide to how wind chill is calculated before heading out to clear it.

Why ice is so dangerous on the road

The Federal Highway Administration (FHWA), using five-year averages from 2019 to 2023 based on National Highway Traffic Safety Administration data, reports an average of 156,164 crashes a year on icy pavement, with 41,860 people injured and 521 killed. NSSL notes that about 70% of injuries related to ice and snow happen in vehicles.

The NWS ice safety page highlights a few traps:

• Bridges and overpasses freeze before other road surfaces, so they can be icy when the rest of the road is only wet.
• Black ice is patchy, hard-to-see ice on roads. It is often clear, with the dark pavement visible underneath, and is most common in the early morning after melted snow refreezes overnight or after wet roads drop below freezing.
• Freezing drizzle can create black ice too. NSSL and the NWS have developed a tool that helps forecasters anticipate when road temperatures fall below freezing for exactly this reason.

How to stay safe in sleet and freezing rain

The NWS advice is simple: under a Winter Storm Warning, delay travel until conditions improve, and under an Ice Storm Warning, travel is strongly discouraged. If you must go out:

• Treat bridges, overpasses and wet-looking roads near or below freezing as icy, especially in the early morning.
• Stay clear of trees and power lines that are coated in ice, since the weight can snap branches and bring lines down.
• Plan for power outages during a long freezing rain event, because repairs can take days.
• Pace yourself when clearing sleet or snow. NSSL notes that most winter storm deaths are not caused directly by the storm, and include heart attacks while shoveling as well as crashes and hypothermia.

For real-time alerts, radar and forecasts during the next winter storm, follow the LiveNewsWorld U.S. Weather Live center. NOAA notes that the main types of precipitation in a winter storm are snow, sleet and freezing rain. To see how some of the most intense winter storms develop, read our explainer on the bomb cyclone.

The bottom line

Sleet and freezing rain both begin as snow and both depend on a layer of warm air above colder air near the ground. If the cold layer at the surface is deep, melted drops refreeze into bouncing ice pellets: sleet. If it is thin, the drops stay liquid and freeze on contact: freezing rain. Freezing rain is usually the bigger threat because its glaze builds on everything it touches, and about a quarter inch can prompt an Ice Storm Warning. When either is forecast, watch your local NWS alerts and stay off the roads if you can.

Sources

• NOAA National Severe Storms Laboratory, Severe Weather 101: Winter Weather Types, plus Winter Weather Basics, FAQ and Forecasting pages
• National Weather Service Glossary: sleet, freezing rain, freezing drizzle, glaze, ice storm, hail and graupel
• National Weather Service, Ice Storms (ice safety, black ice)
• National Weather Service, Winter Weather Warnings, Watches and Advisories
• Federal Highway Administration, How Do Weather Events Affect Roads? (five-year averages 2019 to 2023, based on NHTSA data)