I don't think there's a scenario where even the arctic is too hot to survive in. Keep in mind it's not in normal Norway, it's on the island of Svalbard, which is closer to the North Pole than anything and IIRC has an average temperature of -15C pretty much year-round. Assuming the arctic continues warming at 4x the global average it won't start reaching thawing temperature on the surface until 4 degrees warming.

Plus, the cold is nice but seeds can actually last a really long time even at room temperature. I'm reminded of the date tree seed they found and successfully planted after a couple of millennia in Israel.

I'm kind of a doomer but that specific one seems both doable and actually being done.