Michigan's ice-tracking season runs November through March. During that window, this report updates accumulated freezing degree days, nearby weather, and NOAA Great Lakes ice cover across six waters. From April through October, it reports off season rather than implying that ice exists.
Weather and satellite context only. Never a safety rating.
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Each page states what is observed and what is only inferred.
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 compares accumulated cold across six Michigan waters with a ten year station normal, while Great Lakes ice cover is compared with a 54 year climatology.
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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Before comparing numbers, compare the water. Depth, current, exposure, and the kind of remote data available determine what the same cold spell can mean in six different places.
| Water | Why it behaves differently | What can change the trip | Remote screen available |
|---|---|---|---|
| Saginaw Bay | Shallow, wind-exposed Great Lakes bay that can respond quickly to both cold and thaw. | Wind direction, working cracks, and rapid nearshore-to-offshore differences. | Accumulated cold + Lake Huron satellite context + surface cameras. |
| Houghton Lake | Large but relatively shallow inland lake that generally responds to sustained cold earlier than deeper northern basins. | Thaw cycles, local variation, and concentrated shanty or vehicle traffic. | Accumulated cold + nearby weather + surface camera; no satellite lake-ice product. |
| Lake St. Clair | Shallow lake inside a flowing river system, so current is part of the ice problem everywhere. | Current, channels, river influence, and shipping-related open water. | Accumulated cold + Lake St. Clair satellite context + current weather. |
| Little Bay de Noc | Protected northern Lake Michigan bay with a long cold season and important river-mouth and outer-bay differences. | Escanaba and Ford river mouths plus wind-driven movement toward the outer bay. | Accumulated cold + Lake Michigan satellite context + current weather. |
| Grand Traverse Bay | Deep Great Lakes bay with large thermal mass; protected shallow pockets can behave very differently from the main basin. | Depth and the difference between protected pockets and the open main basin. | Accumulated cold + Lake Michigan satellite context + current weather. |
| Burt and Mullett | Two deep inland lakes in a connected waterway, so depth delays freeze-up and connecting flow creates local uncertainty. | Indian River and other current or inlet influence between the basins. | Accumulated cold + nearby weather; no satellite lake-ice product. |
This matrix is a decision shortcut, not a ranking and never a safety rating. Open the water page for its current readings, camera availability, and data limits.
| Water | Season cold | Air temp | Wind | Lake ice | Stage |
|---|---|---|---|---|---|
| Saginaw Bay Saginaw MBS International Airp | ... | ... | ... | ... | ... |
| Houghton Lake Houghton Lake, Roscommon Count | ... | ... | ... | ... | ... |
| Lake St. Clair Detroit City Airport | ... | ... | ... | ... | ... |
| Little Bay de Noc Escanaba, Delta County Airport | ... | ... | ... | ... | ... |
| Grand Traverse Bay Traverse City Cherry Capital A | ... | ... | ... | ... | ... |
| Burt and Mullett Alpena County Regional Airport | ... | ... | ... | ... | ... |
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Heading north? Check the rest of the trip before you drive.
Snow instead of ice? Compare Michigan XC ski trails or open live XC conditions. The ski system treats snow as a regional signal and operator grooming reports as trail truth.
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.
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.
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.
The largest and most heavily fished ice sheet in Michigan, and the one that puts the most people in the water. Saginaw Bay is shallow, wide open to wind, and it freezes and breaks up faster than almost anything...
The largest inland lake in Michigan and the center of the state's ice fishing culture. Shallow, wind exposed for an inland lake, and surrounded by more shanties in February than anywhere else in Michigan....
Shallow, current driven, and the closest hard water to several million people. Lake St. Clair produces excellent perch and pike ice fishing and it has some of the least forgiving ice in the state because of the...
The Upper Peninsula walleye destination, and the coldest of the regions on this page. Little Bay de Noc is a long protected arm off northern Lake Michigan that reliably makes better ice than anything in the Low...
Deep, cold, and the least likely of these waters to lock up. Grand Traverse Bay only makes broad ice in genuinely hard winters, and when it does the whitefish and lake trout fishing is worth the wait....
Two large deep northern inland lakes connected by the Inland Waterway, known for walleye, perch, and a genuine big fish reputation. Deeper than Houghton, later to freeze, and complicated by the current moving b...
Nothing on this page can tell you that, and no site can. Everything here is accumulated weather data and satellite observation, and none of it measures the ice under your feet. The Michigan DNR does not recognize a reliable inch thickness rule and states that ice on the bays of the Great Lakes will always be more fragile than ice on inland lakes. What accumulated cold can tell you is whether it has been cold enough, for long enough, for ice to have formed at all, and whether this winter is running ahead of or behind its ten year accumulated-cold normal. Separately, the parent Great Lake can be compared with its 54 year ice-cover climatology. Those are useful screens before you drive north and useless substitutes for testing. Test with a spud bar or auger every few steps, on every trip, including water you fished last week and found solid.
Ice formation tracks accumulated cold rather than any single cold morning, which is why one hard overnight freeze in December means much less than people expect. The measure used here is accumulated freezing degree days: every day below freezing adds to a running total from freeze up, and that total is compared against a ten year station average for the same date. A shallow, sheltered inland lake locks up on a modest total. A wide, wind exposed body like Saginaw Bay needs far more, because wind keeps the water moving and mixing, and moving water sheds cold instead of holding it. That is why two waters a hundred miles apart sit at completely different stages in the same week, and why a single statewide ice number would be worse than none at all.
Only the Great Lakes waters have a satellite product, and the data used here is lake-wide rather than bay-specific. Saginaw Bay displays the Lake Huron average and Grand Traverse Bay displays the Lake Michigan average, so each is a directional parent-lake signal rather than an observation of that bay. Inland lakes have no comparable product. Nobody flies a satellite ice analysis over Houghton Lake or Mullett Lake, so for those waters the accumulated cold figure and the ten year station comparison are all there is. This is the most important limitation to understand about this page. On the Great Lakes it can describe whole-lake ice conditions. On inland lakes it can only say whether the weather has been cold enough that ice ought to have formed.