Missoula's housing stock runs older on average, median build year 1991, with a fair amount of pre-1980s hardware still in service. Lolo skews a touch newer, median 1995, which usually means factory-installed galvanized cable rather than the older, thinner wire some of the city's original doors still carry. That's a small difference, but it matters: newer cable corrodes slower, so when it fails here it's more often fatigue from years of winter cycling than straight rust. This area sits in the same severe cold climate band as the rest of the valley, and repeated freeze-thaw on a cable anchor bracket works it loose over time, even on a door that's only thirty years old instead of fifty. Add a long winter of ice buildup at the bottom of the track, and a cable that's been slowly stretching under an unbalanced spring finally lets go on a cold morning. It's rarely one single cause - it's a newer cable meeting the same cold that wears on every door in this valley.