Black ice is the most dangerous hazard of a Chicago winter — and the one most people never see coming. It's thin, clear, nearly invisible against the pavement, and it's behind a huge share of winter slip-and-falls. Here's why it forms, where it hides, and how to stop it.
What makes black ice so dangerous
Black ice isn't actually black — it's clear, which lets the dark pavement show through, so a walkway that looks merely wet is often a sheet of ice. Because you can't see it, you don't adjust your footing until you're already down. That's what makes it far more dangerous than a visible pile of snow.
Where it forms in Chicago
Black ice shows up wherever water sits and refreezes: shaded, north-facing walks that never catch the sun; low spots and poorly drained areas where meltwater pools; and — most commonly — surfaces that were cleared during the day and then refroze overnight as temperatures dropped. A sunny afternoon melt followed by a hard Chicago freeze is a black-ice factory.
Why shoveling alone isn't enough
Here's the trap: you can clear every flake of snow and still end up with black ice, because the thin film of meltwater left behind freezes solid. Removing snow is only half the job. Preventing the refreeze — with salt or de-icer — is the half that actually keeps people on their feet.
How to prevent it
Clear surfaces down to the pavement so there's less snow to melt and refreeze. Apply salt or a quality de-icer proactively, before the overnight freeze, not after someone slips. Keep drains and downspouts clear so meltwater has somewhere to go. And watch your problem spots — the shaded walk, the low corner, the north entrance — which refreeze first and hardest.
How Snow Pushers handles black ice
Salting is built into our service, and our de-icing and ice removal targets exactly the hidden, refrozen surfaces that cause falls. We treat proactively based on the forecast, so your walks and entrances are protected through the overnight freeze — not just cleared and left to refreeze.