Minnesota · Cass County
Thunder Lake Ice-Out Dates
The ice usually goes out of Thunder Lake around April 20 — the third week of April. Earliest ever: April 13 (2015). Latest: May 14 (2013).
April 20Usually around
April 13Earliest ever (2015)
May 14Latest ever (2013)
8Years of record (2003–2022)
The 2027 season
Tracking resumes when the ice forms.
Every recorded ice-out
8 years on the books, 2003–2022. Newest first.
| Year | Ice-out date |
|---|---|
| 2022 | May 7 |
| 2019 | April 26 |
| 2015 | April 13 |
| 2013 | May 14 |
| 2007 | April 21 |
| 2005 | April 14 |
| 2004 | April 20 |
| 2003 | April 20 |
Late ice is unpredictable — no date on this page says the ice is safe.
Records: Minnesota DNR ice-out records. Last checked August 2026.