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Earth's outer shadow, the penumbra, will begin to cross the Moon at 1:57am Pacific, 3:57am Central time (xjenavivex warns that East Coasters might not be able to see it). Earth's darker, inner shadow (the umbra) will begin to blot out the Moon beginning at 3:17am Pacific (add hours as appropriate). At maximum (4:38am Pacific), more than half of the full Moon will lie in shadow. The eclipse ends as morning light begins to blue the sky.
EDIT: Sorry about the time mix-up. Fixed!