When Does Barnum Lake Freeze? Typical Ice-In Nov 24, Ice-Out Apr 17
Barnum Lake in Cass County, Minnesota usually freezes over around Nov 24, and usually has ice-out around Apr 17, based on Minnesota DNR ice observations recorded between 2001-2013. That works out to roughly 221 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 Barnum Lake
| Typical freeze-up (ice-in) | Nov 24 |
| Typical ice-out | Apr 17 |
| Earliest freeze-up on record | Nov 3, 2004 |
| Latest freeze-up on record | Dec 19, 2001 |
| Earliest ice-out on record | Mar 24, 2012 |
| Latest ice-out on record | May 8, 2013 |
| Open-water season | ~221 days |
| Winters observed | 56 |
| Location | Cass County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Barnum 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 Barnum Lake has landed as early as Mar 24, 2012 and as late as May 8, 2013 — a spread of weeks around the Apr 17 median. Freeze-up has ranged from Nov 3, 2004 to Dec 19, 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. Barnum Lake carries an overall water-quality grade of A — the full breakdown is on the lake report.
Source: Minnesota DNR Climate Office ice-in / ice-out records, observations from 2001-2013.