When Does Sleepy Eye Lake Freeze? Typical Ice-In Nov 25, Ice-Out Mar 27
Sleepy Eye Lake in Brown County, Minnesota usually freezes over around Nov 25, and usually has ice-out around Mar 27, based on Minnesota DNR ice observations recorded between 1991-2017. That works out to roughly 243 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 Sleepy Eye Lake
| Typical freeze-up (ice-in) | Nov 25 |
| Typical ice-out | Mar 27 |
| Earliest freeze-up on record | Nov 5, 1991 |
| Latest freeze-up on record | Dec 18, 2015 |
| Earliest ice-out on record | Mar 6, 2017 |
| Latest ice-out on record | Apr 18, 2013 |
| Open-water season | ~243 days |
| Winters observed | 28 |
| Location | Brown County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Sleepy Eye 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 Sleepy Eye Lake has landed as early as Mar 6, 2017 and as late as Apr 18, 2013 — a spread of weeks around the Mar 27 median. Freeze-up has ranged from Nov 5, 1991 to Dec 18, 2015. 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 Sleepy Eye Lake is on the lake report.
Source: Minnesota DNR Climate Office ice-in / ice-out records, observations from 1991-2017.
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