When Does the Ice Go Out on Armstrong Lake? Typical Ice-Out Mar 31
Armstrong Lake in St. Louis County, Minnesota usually has ice-out around Mar 31, based on Minnesota DNR ice observations recorded between 2010-2015. These are typical dates across many winters, not a forecast — individual years swing by weeks in either direction.
Ice record for Armstrong Lake
| Typical ice-out | Mar 31 |
| Earliest ice-out on record | Mar 31, 2010 |
| Latest ice-out on record | May 14, 2015 |
| Winters observed | 3 |
| Location | St. Louis County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Armstrong 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 Armstrong Lake has landed as early as Mar 31, 2010 and as late as May 14, 2015 — a spread of weeks around the Mar 31 median. 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 Armstrong Lake is on the lake report.
Source: Minnesota DNR Climate Office ice-in / ice-out records, observations from 2010-2015.
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