When Does Halfbreed Lake Freeze? Typical Ice-In Nov 20, Ice-Out Apr 18
Halfbreed Lake in Washington County, Minnesota usually freezes over around Nov 20, and usually has ice-out around Apr 18, based on Minnesota DNR ice observations recorded between 2006-2019. That works out to roughly 216 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 Halfbreed Lake
| Typical freeze-up (ice-in) | Nov 20 |
| Typical ice-out | Apr 18 |
| Earliest freeze-up on record | Nov 7, 2019 |
| Latest freeze-up on record | Nov 30, 2006 |
| Earliest ice-out on record | Mar 30, 2007 |
| Latest ice-out on record | May 1, 2013 |
| Open-water season | ~216 days |
| Winters observed | 10 |
| Location | Washington County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Halfbreed 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 Halfbreed Lake has landed as early as Mar 30, 2007 and as late as May 1, 2013 — a spread of weeks around the Apr 18 median. Freeze-up has ranged from Nov 7, 2019 to Nov 30, 2006. 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 Halfbreed Lake is on the lake report.
Source: Minnesota DNR Climate Office ice-in / ice-out records, observations from 2006-2019.
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