When Does Crystal Lake Freeze? Typical Ice-In Nov 27, Ice-Out Apr 5
Crystal Lake in Dakota County, Minnesota usually freezes over around Nov 27, and usually has ice-out around Apr 5, based on Minnesota DNR ice observations recorded between 1991-2024. That works out to roughly 236 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 Crystal Lake
| Typical freeze-up (ice-in) | Nov 27 |
| Typical ice-out | Apr 5 |
| Earliest freeze-up on record | Nov 4, 1991 |
| Latest freeze-up on record | Dec 20, 2001 |
| Earliest ice-out on record | Mar 2, 2024 |
| Latest ice-out on record | Apr 30, 2018 |
| Open-water season | ~236 days |
| Winters observed | 84 |
| Location | Dakota County, Minnesota |
These are dates, not an ice-safety reading
A typical freeze-up date tells you when Crystal 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 Crystal Lake has landed as early as Mar 2, 2024 and as late as Apr 30, 2018 — a spread of weeks around the Apr 5 median. Freeze-up has ranged from Nov 4, 1991 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. Crystal Lake carries an overall water-quality grade of C — the full breakdown is on the lake report.
Source: Minnesota DNR Climate Office ice-in / ice-out records, observations from 1991-2024.