I keep my 15% Nitro Cool Power in the garage. Lately, it's been single digits over night and mid teens during the day here in Denver. I'm guessing the garage is about 40F or upper 30s. Do i have any issues with keeping my fuel in this temp? I don't want to bring the fuel inside the house.

As long as the container is sealed, you will have no problem. Temperature will not affect the quality of the fuel. The only thing that will cause fuel deterioration is water condensation inside the container. All components of model fuel (not gas) have very long life and should last many years. But, water will dilute the mixture and cause all kinds of problems.

Paul

I am experiencing cold temps also. Around 11 degrees as a high. I put 2 electric heaters in my garage to keep the temp somewhat avreage, around 55-60 degrees. That is to help the ARF's I have not built yet.
The fuel stays in a bedroom closet covered and not subjected to temp differences. I am not stating, put your fuel into a bedroom closet, but cold and radical temperature changes create water,condisation, and you don't want that. Keep your fuel at a constant temperature if possible, it will work better for you in the long run. Some people advise not storing fuel indoors, but if it's new, unopened fuel, I would say it's OK. Just My Opinion.

No issues. Lots of people keep fuel in unheated garages for years. I keep my fuel inside the house in a closet but that's just my preference.

When I lived in the mountains I stored mine in an unheated shed without problems. Sometimes it was out there for years. My temps there were in the low 20s and over 115 during the summer.

If your garage has windows, either, keep the fuel in the case or at least covered.

I keep mine in the crawl space in my basement, although two people have told me this is not a great idea. One is a local fire fighter, the other an emergency room doctor. Besides being a fire hazard, methanol is quite toxic.

Store it in an exterior shed if you have one.

Methanol is only toxic to any degree if you inhale it constantly or drink it. I wouldn't worry about it from that aspect.

Agreed. I don't worry about it myself. But it is good for people to know what they are dealing with.

For anyone interested, here is a Material Safety Data Sheet on methanol, the main ingredient in glow fuel: http://www.jtbaker.com/msds/englishhtml/M2015.htm