Most houses in this part of the Twin Cities went up between 1957 and 2005, with the typical build year sitting around 1977, which means a lot of original torsion springs are now outliving their rated cycle count. Across the 52 named areas that make up this stock, the bulk of garages date to the 1960s and '70s, which is exactly when steel torsion springs were spec'd lighter than what we install today. That hardware wasn't built to last fifty winters.
Minnesota's cold-severe swings put a lot of stress on springs and openers that were never rated for this kind of temperature drop. Steel contracts in the cold, lubricant thickens, and a spring that's already fatigued from forty years of cycling will finally let go on the coldest morning of the year, not the mildest one. We see the same pattern on torsion bar ends and on the nylon gears inside older chain-drive openers from that era - they go brittle, then they strip.
If your door is original to a house from that build window, you're not dealing with a one-off failure. You're dealing with hardware that was never meant to see this many freeze-thaw cycles in the first place.