When Does Mille Lacs Lake Freeze? Typical Ice-In Dec 3, Ice-Out Apr 25
Mille Lacs Lake in Aitkin County, Minnesota usually freezes over around Dec 3, and usually has ice-out around Apr 25, based on Minnesota DNR ice observations recorded between 1996-2024. That works out to roughly 222 days of open water a year. These are typical dates across many winters, not a forecast — individual years swing by weeks in either direction.
Ice record for Mille Lacs Lake
| Typical freeze-up (ice-in) | Dec 3 |
| Typical ice-out | Apr 25 |
| Earliest freeze-up on record | Nov 19, 1996 |
| Latest freeze-up on record | Dec 22, 2001 |
| Earliest ice-out on record | Mar 16, 2024 |
| Latest ice-out on record | May 16, 2013 |
| Open-water season | ~222 days |
| Winters observed | 123 |
| Location | Aitkin County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Mille Lacs Lake has usually iced over — it does not tell you the ice is safe, and we hold no thickness measurement for this or any lake. The Minnesota DNR is explicit that no ice is ever completely safe: thickness varies across a single lake, and current, springs, aerators, and insulating snow all weaken it. Ice that held a truck last week may not hold a person today.
Read the ice-thickness guidelines before going out, and check current conditions with the Minnesota DNR ice-safety page and local bait shops, which track conditions lake by lake.
How much the timing varies
Ice-out on Mille Lacs Lake has landed as early as Mar 16, 2024 and as late as May 16, 2013 — a spread of weeks around the Apr 25 median. Freeze-up has ranged from Nov 19, 1996 to Dec 22, 2001. That year-to-year swing is why a median date is a planning tool, not a schedule. Freeze-up is driven by accumulated cold after the lake turns over in fall; ice-out by late-winter air temperature, sun angle, and how much snow sits on top of the ice reflecting it. The full nutrient and algae breakdown for Mille Lacs Lake is on the lake report.
Source: Minnesota DNR Climate Office ice-in / ice-out records, observations from 1996-2024.
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