Straight to the point on this one, I have about 1800 yards of monofilament that I bought less than a year ago. It's been stored in a garage out of heat, UV, and moisture since I've bought it. The only problem is that I live in Minnesota, so it's been sitting in some very cold temperatures for around 5 months. Is it likely that this line is still good to use, or should I chuck it and start from fresh? 

I’ve used line older than that before. I just spray the spool with line conditioner a couple of times before spooling it. 
I spray line conditioner as I’m spooling too. 
I figured, you never know how long the spool has set in the factory, the warehouse or, the store before I bought it.

Actually no.  Some people store their mono in a freezer saying that the cold preserves it.  I've got some mono that dates back 15 years, stored in the basement out of the light, and I don't see any difference.  Usually you get a white coating on the line when it begins to deteriorate.

11 minutes ago, Reel said:

Actually no.  Some people store their mono in a freezer saying that the cold preserves it.  I've got some mono that dates back 15 years, stored in the basement out of the light, and I don't see any difference.  Usually you get a white coating on the line when it begins to deteriorate.

Is that right? Interesting. I'm not worried about the age, just the cold aspect, so that's good news. It's two separate spools of forest green mono, so I'm hoping to get some good use out of it. I figured the cold would make it brittle. 

 

I guess I'll break test a strand of it to make sure it's still strong. 

I have some mono from '96 that has been stored in a cool dark place, still as good as new. I'm sure some formulations may not hold up as well. I don't think any states have passed any laws against spooling some up tying it to something solid, and yanking on it to test it and your knots.