Ice is not weather, it is history. A cold morning tells you almost nothing. What matters is how much cold has accumulated since freeze up, and whether this winter is running ahead of or behind normal. This tracks both, across six Michigan waters, against a 54 year baseline.

Season cold accumulation

The bar shows accumulated freezing degree days so far this season for each water. The marker is where a normal season sits on this calendar date. Ice growth follows the square root of accumulated cold, so this is the single most useful number for whether ice should be forming at all.

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Conditions by water

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What this site does and does not tell you

There are three separate things people mean when they ask about ice conditions, and only two of them can be answered with data from a distance.

• Has it been cold enough for ice to form? This is answerable, and it is what the accumulated cold number is for. It comes from real daily temperature records at a station near each water.
• Is there ice out there right now? Partly answerable on the Great Lakes, where NOAA publishes satellite derived ice cover. Not answerable on inland lakes, which have no comparable product, and the inland pages here say so.
• Is the ice safe where I want to stand? Not answerable. Not by this site, not by any site, not by a forum post from yesterday. Michigan DNR rejects the inch thickness rule entirely because ice does not form uniformly, and thickness can change by feet within a few yards.

The third question is the one that matters most and the only honest answer is a spud bar in your hands. Everything here is context for the drive, not permission to walk out.

The waters

Six waters, chosen because they carry most of Michigan ice fishing traffic and because they behave very differently from each other. A shallow wind exposed bay, a deep northern basin, a lake sitting on top of a river, and inland lakes with no satellite coverage at all.

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