Stored in an uninsulated, unheated shed in Colorado. Not as cold as -25 F except for rare occasions, but below zero wasn't all that uncommon. Mostly single digits and teens at night. No problems from the cold.
The one caveat I would make is that as long as the kayaks sit unused in the shed, they're only subject to gradual heating and cooling. If, on the other hand, you take it from -25 F shed, drive on a really cold day, and put it in 35 degree seawater (or worse yet, into and out of a heated swimming pool), that's a different can of worms.
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