You can dig it up and pot it (carefully, taking as much root mass as possible), bring it indoors, and set it in sunlight in a room temperature or slightly cooler locale.

Blooming inside, even with supplemental plant lights, will be poor, but you might get a few.

Snaps are short-lived perennials, not annuals, so replanting in your mid-spring garden should reward you with a second showing from the plant--and again the following fall.

I often have snapdragons survive the winter. Leave it in the ground and cover it with a heavy layer of leaves. It should survive. You can also wintersow some snapdragon seeds. I find that they germinate very well using the Wintersowing technique. Good luck.

Martha