GDMBR, how late in the year can Banff to maybe Rooseville be ridden?

[bygraham]

I may end up near Banff in early Sept.  Is that too late to ride Banff south to maybe Roosville, maybe a little further south?
Thanks

[John Nettles]

Can't answer but those that can may need to know are you talking Banff, Butte, Helena, Lima, etc.?  I would think the places would have different dates and you would need to base the tour on the "snow date" of any part of the tour, not necessarily Banff.

I would suggest you look at WeatherSpark as they typically have very good averages and data available.

Best, John