When Does Rat Lake Freeze? Typical Ice-In Nov 23, Ice-Out Apr 12
Rat Lake in Aitkin County, Minnesota usually freezes over around Nov 23, and usually has ice-out around Apr 12, based on Minnesota DNR ice observations recorded between 2002-2022. That works out to roughly 225 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 Rat Lake
| Typical freeze-up (ice-in) | Nov 23 |
| Typical ice-out | Apr 12 |
| Earliest freeze-up on record | Nov 18, 2002 |
| Latest freeze-up on record | Nov 27, 2012 |
| Earliest ice-out on record | Mar 21, 2012 |
| Latest ice-out on record | Apr 29, 2022 |
| Open-water season | ~225 days |
| Winters observed | 8 |
| Location | Aitkin County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Rat 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 Rat Lake has landed as early as Mar 21, 2012 and as late as Apr 29, 2022 — a spread of weeks around the Apr 12 median. Freeze-up has ranged from Nov 18, 2002 to Nov 27, 2012. 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 Rat Lake is on the lake report.
Source: Minnesota DNR Climate Office ice-in / ice-out records, observations from 2002-2022.
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