Leirbreen (Leirbrean) is an outlet glacier of Smørstabbreen in the Jotunheimen mountain massif. Length change measurements started in 1909.
| Year | Front variation (m) | Cumulative front variation (m) |
|---|---|---|
| 1909 | 0 | Start |
| 1910 | 0 | 0 |
| 1911 | -4 | -4 |
| 1912 | -8 | -12 |
| 1936 | -70 | -82 |
| 1937 | -18 | -100 |
| 1938 | -13 | -113 |
| 1939 | -9 | -122 |
| 1941 | -32 | -154 |
| 1942 | -16 | -170 |
| 1944 | -12 | -182 |
| 1945 | -15 | -197 |
| 1946 | -56 | -253 |
| 1947 | -32 | -285 |
| 1948 | -18 | -303 |
| 1949 | -5 | -308 |
| 1950 | -23 | -331 |
| 1951 | -6 | -337 |
| 1952 | -14 | -351 |
| 1953 | -10 | -361 |
| 1954 | -10 | -371 |
| 1956 | -27 | -398 |
| 1957 | -10 | -408 |
| 1959 | -25 | -433 |
| 1960 | -1 | -434 |
| 1961 | -7 | -441 |
| 1962 | -2 | -443 |
| 1963 | -6 | -449 |
| 1966 | -20 | -469 |
| 1971 | -32 | -501 |
| 1975 | -19 | -520 |
| 1976 | 0 | -520 |
| 1977 | -6 | -526 |
| 1979 | 0 | -526 |
| 1980 | -13 | -539 |
| 1981 | -12 | -551 |
| 1984 | -15 | -566 |
| 1985 | -7 | -573 |
| 1987 | -11 | -584 |
| 1990 | -11 | -595 |
| 1993 | -17 | -612 |
| 1995 | -14 | -626 |
| 1996 | -5 | -631 |
| 1997 | 0 | -631 |
| 1998 | -10 | -641 |
| 1999 | -3 | -644 |
| 2000 | -6 | -650 |
| 2001 | -7 | -657 |
| 2003 | -28 | -685 |
| 2004 | -5 | -690 |
| 2005 | 1 | -689 |
| 2006 | -16 | -705 |
| 2007 | 6 | -699 |
| 2008 | 33 | -666 |
| 2010 | -50 | -716 |
| 2011 | -9 | -725 |
| 2012 | -15 | -740 |
| 2013 | -11 | -751 |
| 2014 | -21 | -772 |
| 2015 | -34 | -806 |
| 2016 | -13 | -819 |
| 2017 | -20 | -839 |
| 2018 | -46 | -885 |
| 2019 | -28 | -913 |
| 2020 | -15 | -928 |
| 2021 | -23 | -951 |
| 2022 | -31 | -982 |
| 2023 | -33 | -1015 |
| 2024 | -27 | -1042 |
| 2025 | -12 | -1054 |