Seattle is 3 hours behind Boston. When it's 12:00 PM in Boston, it's 9:00 AM in Seattle. Both cities observe DST, maintaining the 3-hour difference year-round.
Boston uses ET (Eastern Time) while Seattle uses PT (Pacific Time).
Optimal window: 11:00 AM - 6:00 PM Boston time (8:00 AM - 3:00 PM Seattle). Late morning calls from Boston catch business hours in Seattle.
Both cities are major tech hubs with companies like Amazon (Seattle) and many biotech firms (Boston).