Minnesota · Lake County
Flat Horn Lake Ice-Out Dates
The ice usually goes out of Flat Horn Lake around April 21 — the third week of April. Earliest ever: April 12 (1987). Latest: May 3 (1983).
The 2027 season
Tracking resumes when the ice forms.
Every recorded ice-out
8 years on the books, 1976–1988. Newest first.
| Year | Ice-out date |
|---|---|
| 1988 | April 28 |
| 1987 | April 12 |
| 1986 | April 17 |
| 1984 | April 21 |
| 1983 | May 3 |
| 1982 | April 28 |
| 1978 | May 2 |
| 1976 | April 17 |
When Flat Horn freezes over
Flat Horn Lake usually freezes over around November 13 — the second week of November. Earliest on record: October 23 (1976–77). Latest: November 22 (1977–78).
A freeze-up crosses New Year, so each row is the winter it belongs to: the winter of 1987–88 froze on November 19. Newest first.
| Winter | Ice-in date |
|---|---|
| 1987–88 | November 19 |
| 1985–86 | November 7 |
| 1984–85 | October 30 |
| 1983–84 | November 13 |
| 1978–79 | November 14 |
| 1977–78 | November 22 |
| 1976–77 | October 23 |
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.