Good morning! We have some in the refrigerator for almost 5 years now. If they get hot, they can get "sticky" (they are biodegradable and if they get hot some of the ingredients we put in them start to "leech out"). Some people think they work even better when they get sticky.
The pellets aren't as bad about sticking together but the worms are harder to pull apart without tearing.
We just started wrapping the worms individually and they did great in 89 degree temps all day long.
A cooler is perfect on the hot days if you don't want them to change at all.
I've had them in my jeep all summer and they were stuck together. Worked like a charm!
