Sorry this has waited a week for an answer. I was hoping someone else who knew would reply. I have to think that freezing will change some of the liquid products, but I'm not sure. I keep Roundup and some other things in my garage, and if it freezes, its only very lightly. I'd bet the granular stuff is OK, but just to be safe, I'd keep the liquid products in the garage.

I'm with Steve, but doubly sorry because when I first saw it I thought I'd wait a day or two and if there was no answer suggest that you try the Soil, Compost and Mulch forum. I'm not sure if that's the best fit, but it's a reasonably good fit.

I think any of the solids or pellets should be ok. I think one of the biggest problems with liquids is that when water freezes it expands, so you could end up with some burst jugs and a mess.

Thanks. My straw bails do not seem to be smelling or heating up with all the lawn fertilizer that was added like I expected. The pellet fertilizer is two years old,stored in an unheated garage, Maybe that's the issue.