Short answer: it's almost never actual ice. In Suwannee County, a "frozen" garage door is usually moisture doing the damage, not a hard freeze. Humidity swells the weatherstripping, dew and overnight condensation glue the bottom seal to the slab, or months of rust on tracks and hardware finally catch up with you the first cold, damp morning of the season. The fix depends on which of those is happening, so the first job is figuring out which one it is.