Minnesota · Itasca County
Rock Lake Ice-Out Dates
The ice usually goes out of Rock Lake around April 20 — the third week of April. Earliest ever: April 3 (2012). Latest: May 6 (2019).
The 2027 season
Tracking resumes when the ice forms.
Every recorded ice-out
10 years on the books, 1994–2019. Newest first.
| Year | Ice-out date |
|---|---|
| 2019 | May 6 |
| 2016 | April 20 |
| 2012 | April 3 |
| 2011 | April 29 |
| 2010 | April 5 |
| 2009 | May 1 |
| 2007 | April 26 |
| 2006 | April 14 |
| 2004 | April 23 |
| 1994 | April 18 |
When Rock freezes over
Rock Lake usually freezes over around December 4 — the first week of December. Earliest on record: December 1 (2010–11). Latest: December 25 (2015–16).
A freeze-up crosses New Year, so each row is the winter it belongs to: the winter of 2019–20 froze on December 3. Newest first.
| Winter | Ice-in date |
|---|---|
| 2019–20 | December 3 |
| 2017–18 | December 10 |
| 2015–16 | December 25 |
| 2011–12 | December 9 |
| 2010–11 | December 1 |
| 2009–10 | December 13 |
| 2008–09 | December 8 |
| 2006–07 | December 4 |
| 2005–06 | December 2 |
| 2003–04 | December 2 |
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.