The annual walk on Blue Mountain is in March each year. However you can hike it any time you want to. I know technically it's private property but you can download an app called All Trails and it will take you to the trail head everyone uses all the time. Happy trails!
To be honest I don't really know but most likely you would want to check with the city of Grand Terrace website to find out more info
Thanks! Your answer is awaiting moderation.