Information regarding summer mountain conditions can be found on the Mountain Conditions Report, published by the Association of Canadian Mountain Guides.
When the sun comes out, temperatures soar above freezing, or rain falls, expect Wet Loose avalanches. This is especially relevant in steep, high consequence terrain, such as gully climbs on Mt. Andromeda, Mt. Edith Cavell and Mt Woolley/Diadem.
Watch out for large cornices still present at ridge top.
Any new snow falling high in the Alpine can quickly become Wind Slabs at any time of the year. This has been a problem in the past on terrain like the Silverhorn and Ramp routes on Mt. Athabasca, and on other high peaks, such as Mt. Columbia.
Deep persistent slabs are best managed by:
Cornices are best managed by:
The Mountain Weather Forecast is available from Avalanche Canada (https://www.avalanche.ca/weather/forecast). Detailed local forecasts are available from sites like SpotWX (https://spotwx.com/)
An overview is available: https://www.avalanche.ca/pages/static-page/spring-conditions
Generally, danger increases with daytime warming, & decreases with cold, clear nights. As the snow thins, crevasse bridges weaken. Use extra care in thin wind-affected areas, eg the Athabasca Glacier.
Avalanches have occurred into the end of July on the high peaks. Activity increases with rising temps, especially during warm and/or sunny afternoons. Use extra caution if the surface hasn't refrozen overnight - clear nights help. Watch for Wind Slabs in the alpine, particularly following snow or rain. Use extra caution if these form above crusts.