Minnesota · St. Louis County
St. Mary's Lake Ice-Out Dates
The ice usually goes out of St. Mary's Lake around April 23 — the fourth week of April. Earliest ever: April 9 (2017). Latest: May 5 (2023).
The 2027 season
Tracking resumes when the ice forms.
Every recorded ice-out
9 years on the books, 2004–2023. Newest first.
| Year | Ice-out date |
|---|---|
| 2023 | May 5 |
| 2020 | April 26 |
| 2018 | May 3 |
| 2017 | April 9 |
| 2015 | April 15 |
| 2008 | May 4 |
| 2007 | April 22 |
| 2005 | April 15 |
| 2004 | April 23 |
When St. Mary's freezes over
St. Mary's Lake usually freezes over around November 22 — the fourth week of November. Earliest on record: November 18 (2018–19). Latest: November 29 (2015–16).
A freeze-up crosses New Year, so each row is the winter it belongs to: the winter of 2022–23 froze on November 23. Newest first.
| Winter | Ice-in date |
|---|---|
| 2022–23 | November 23 |
| 2018–19 | November 18 |
| 2017–18 | November 19 |
| 2015–16 | November 29 |
| 2007–08 | November 22 |
| 2006–07 | November 19 |
| 2005–06 | November 25 |
| 2003–04 | November 25 |
Records: Minnesota DNR ice-in records. Last checked August 2026.
Late ice is unpredictable — no date on this page says the ice is safe.
Records: Minnesota DNR ice-out records. Last checked August 2026.