Stupid, lazy people (spoilers)
They had ample time,a year or more, but: basement unsecured, cellar unsecured. When crisis came Jeffrey Donovan character sent girl into unchecked basement. They had nice kill zone with wire fences and an electrical light but they locked themselves into house. Nobody on guard ,nobody kept an eye after generator. They could use against zombies : electrical fence, fire, mechanical traps, tripwires, masked pits , rotating mechanical blades ( something like from the Ravenholm in Half Life ). Well they thought that zombies have extinct, but once learned the opposite, they had about a week (?) or two to prepare at least something.
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