You can find winds aloft for Canada in several locations within the ForeFlight Mobile EFB app:
Airports page: When viewing an airport, winds aloft forecasts can be viewed by selecting the WEATHER tab and then WINDS ALOFT.
Image 1. Winds aloft on Airports page.
Maps page: Winds aloft forecasts can be viewed on the Maps page within the NavLog. When you have a route entered into the NavLog, simply tap on the altitude advisor button on the left to view winds aloft.
Image 2. Winds aloft from the NavLog on Maps page.
Imagery page: Winds aloft forecasts can be viewed on the Imagery page. These are focused on the USA, but also show winds for southern Canada.
Image 3. Winds aloft on the Imagery page.
File & Brief page: Winds aloft forecasts can be viewed from a flight briefing on the File & Brief page.
Image 4. Winds aloft in a briefing from the File & Brief page.