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Although mountaineers tackle Mount Rainer all year long, the best period to climb is deemed from May to August.
People lose their lives on the mountain each year, so play it safe — check weather reports frequently and consult the ranger at Camp Muir for more up-to-date reports. It is advised not to summit on your own — there are several companies that offer guided summit climbs.
More on Mount Rainier can be found here: mountrainierclimbing.blogspot.ca.