Peyto Glacier has significantly receded since the late 19th century. Here's an approximate timeline of its change over the past century:

Late 19th Century (1800s):

- Peyto Glacier was much larger and extended further down the Peyto Valley.

- The terminus of the glacier was close to the Peyto Lake, or even touching its shore.

Early 20th Century (1900-1920):

- The glacier started to retreat from the lake, leaving behind lateral moraines along its edges.

Mid 20th Century (1930-1950):

- The retreat continued, and the terminus of the glacier was several hundred meters away from the lake.

Late 20th Century (1960-1990):

- The glacier experienced significant melting and recession, with the terminus retreating further up the valley.

- The glacier lost several kilometers in length and became narrower.

21st Century (Present):

- Peyto Glacier continues to retreat at a rapid pace.

- As of recent years, the terminus of the glacier is more than 1.5 kilometers away from the Peyto Lake.

- The glacier is projected to continue losing mass and may eventually disappear completely in the coming decades.