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"Predawn" means an hour or so"Predawn" means an hour or so before morning twilight. You can find your local twilight times in The 2013 Old Farmer's Almanac or here at our sunrise/sunset tool:

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?