You can still successfully overwinter your geraniums even if you don’t have a brightly lit, warm place to keep them. The ideal scenario, according to O'Malia, is an environment that's about 50 degrees ...

Tender geraniums won't survive winter in growing zones 9 and below without protection. They can be overwintered indoors as houseplants or cuttings, or kept in a dormant, bare root state. In spring, ...