I left the squid agave outside for winter for the first time last year. It snowed four times and dropped down to 13 F. degrees on our hill when it was only predicted to be 23 that night. I had it covered with an old horse blanket but I was still super worried. It was just fine!
The smooth agaves are given a pineapple cut to reduce the weight and brought inside. They cannot handle freezes at all. I grow out some pups and replace the large ones when they get to large to bring in. Old man winter gets to have them.
It is a beautiful day today. I will get out and take some more pics later after my camera charges.