Earliest measurable snowfall in Boise since recordkeeping began in 1898, according to the National Weather Service.

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Boise gets earliest snow on record, record cold in Oregon, Washington

12 10 2008
From the Idaho Statesman:

Valley shivers as winter weather makes a premature appearance

Big snow flakes fell early Friday evening, turning Downtown Boise into a giant snow globe for people on their way home from work. The snow caught many people off guard, including this bicyclist heading down Idaho Street between 8th and 9th around 5:45 p.m. Across the Treasure Valley, tree branches heavy with wet, snow-covered leaves fell on power lines, causing scattered power outages.

This is the earliest measurable snowfall in Boise since recordkeeping began in 1898, according to the National Weather Service. At 10 p.m., the Weather Service said 1.7 inches of snow had fallen. The previous earliest recorded snowfall was Oct. 12, 1969, when a little more than an inch fell. And if the snow wasn’t enough, meteorologists say winds across southwestern Idaho will average 25 to 40 mph through Saturday afternoon, with gusts up to 55 mph. Sustained winds of 30 to 40 mph are expected, which can make driving difficult.

There is also some early and record snows in Billings Montana
A snowfall record for Oct. 11 was set in Billings yesterday.

According the National Weather Service, Billings saw 3.1 inches of snow Friday. The old record of 2.8 inches was set in 1969.