When Does Ponto Lake Freeze? Typical Ice-In Nov 25, Ice-Out Apr 20
Ponto Lake in Cass County, Minnesota usually freezes over around Nov 25, and usually has ice-out around Apr 20, based on Minnesota DNR ice observations recorded between 1995-2021. That works out to roughly 219 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 Ponto Lake
| Typical freeze-up (ice-in) | Nov 25 |
| Typical ice-out | Apr 20 |
| Earliest freeze-up on record | Nov 11, 1995 |
| Latest freeze-up on record | Dec 20, 2001 |
| Earliest ice-out on record | Apr 5, 2021 |
| Latest ice-out on record | May 13, 2013 |
| Open-water season | ~219 days |
| Winters observed | 57 |
| Location | Cass County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Ponto 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 Ponto Lake has landed as early as Apr 5, 2021 and as late as May 13, 2013 — a spread of weeks around the Apr 20 median. Freeze-up has ranged from Nov 11, 1995 to Dec 20, 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. Ponto 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 1995-2021.