With winter coming soon in these parts I was wondering, is it a big deal if your sealed fuel sits where it gets below freezing (in the garage), or should it be stored indoors?

It shouldn't hurt the fuel to get below freezing in the winter.  Just make sure you warm it up with the lid on(to keep out moisture) and make sure it is thoroughly mixed before using it.  Theoretically, the cold could cause some of the oil(castor esp.) to separate out.  It will redissolve at more normal temps.

Hey Wayne I have keeped diesel fuel fresh over the winter. How I do it is I put it in metal containers with good sealing caps and store it in the basement as the temp is more consistant. In the garage or storage shed the temp viares allot thru the winter. As for glow fuel I keep it in a cool corner in the original containers.Just make sure the caps are tight. If you notice the jugs deforming then the temp isn't constant enough. Then just buy new fuel in the spring.

I used my old fuel as weed killer a couple of weeks ago. I have one jug that should take me through the winter. I'll buy fresh in the spring.